Difference between revisions of "Pancreas"

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[[Image:Gray 1100 Pancreatic duct.png|thumb|right|250px|A drawing of the pancreas. (WC/Gray's Anatomy)]]
The '''pancreas''' hangs-out in the upper abdomen.  It occasionally is afflicited by cancers, the most common of which is very fatal.   
The '''pancreas''' hangs-out in the upper abdomen.  It occasionally is afflicited by cancers, the most common of which is very fatal.   


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| -
| -
| [http://www.nature.com/modpathol/journal/v20/n1s/fig_tab/3800686f16.html#figure-title (nature.com)]
| [http://www.nature.com/modpathol/journal/v20/n1s/fig_tab/3800686f16.html#figure-title (nature.com)]
| CK7 (acinar comp.), CK8, CK18, CK19
| [[CK7]] (acinar comp.), CK8, CK18, [[CK19]]
| squamoid nests of cells, whorling, nested growth, +/-keratinization
| squamoid nests of cells, whorling, nested growth, +/-keratinization
| none
| none
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===General===
===General===
*Common in the GI tract.
*Common in the GI tract.
*Found in ~ 20% of [[eosphageal]] biopsies above the GEJ.<ref name=pmid20012917>{{cite journal |author=Johansson J, Håkansson HO, Mellblom L, ''et al.'' |title=Pancreatic acinar metaplasia in the distal oesophagus and the gastric cardia: prevalence, predictors and relation to GORD |journal=J. Gastroenterol. |volume=45 |issue=3 |pages=291–9 |year=2010 |month=March |pmid=20012917 |doi=10.1007/s00535-009-0161-4 |url=}}</ref>
*Found in ~ 17-19% of [[stomach|gastro]][[esophagus|esophageal]] junction biopsies.<ref name=pmid23989798/><ref name=pmid20012917>{{cite journal |author=Johansson J, Håkansson HO, Mellblom L, ''et al.'' |title=Pancreatic acinar metaplasia in the distal oesophagus and the gastric cardia: prevalence, predictors and relation to GORD |journal=J. Gastroenterol. |volume=45 |issue=3 |pages=291–9 |year=2010 |month=March |pmid=20012917 |doi=10.1007/s00535-009-0161-4 |url=}}</ref>
*Associated with intestinal metaplasia.<ref name=pmid23989798>{{Cite journal  | last1 = Schneider | first1 = NI. | last2 = Plieschnegger | first2 = W. | last3 = Geppert | first3 = M. | last4 = Wigginghaus | first4 = B. | last5 = Höss | first5 = GM. | last6 = Eherer | first6 = A. | last7 = Wolf | first7 = EM. | last8 = Rehak | first8 = P. | last9 = Vieth | first9 = M. | title = Pancreatic acinar cells-a normal finding at the gastroesophageal junction? Data from a prospective Central European multicenter study. | journal = Virchows Arch | volume =  | issue =  | pages =  | month = Aug | year = 2013 | doi = 10.1007/s00428-013-1471-8 | PMID = 23989798 }}</ref>
**Not associated with changes of [[GERD]], or [[Helicobacter gastritis]].<ref name=pmid23989798/>


===Gross===
===Gross===
*May be a single lesion or a cluster of lesions.<ref name=pmid8724024/>
*May be a single lesion or a cluster of lesions.<ref name=pmid8724024/>
Note:
*''Not'' associated with the endoscopic diagnosis of esophagitis or [[Barrett's esophagus]].<ref name=pmid23989798/>


===Microscopic===
===Microscopic===
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*Trypase +ve.
*Trypase +ve.
*Lipase +ve.
*Lipase +ve.
===Sign out===
It can be debated whether it is worth reporting.
<pre>
ESOPHAGUS (DISTAL), BIOPSY:
- COLUMNAR EPITHELIUM WITH MODERATE CHRONIC, FOCALLY ACTIVE, INFLAMMATION, AND
  PANCREATIC ACINAR METAPLASIA.
- REACTIVE SQUAMOUS EPITHELIUM.
- NEGATIVE FOR INTESTINAL METAPLASIA.
- NEGATIVE FOR DYSPLASIA AND NEGATIVE FOR MALIGNANCY.
</pre>


==Pancreatic ectopia==
==Pancreatic ectopia==
Line 260: Line 277:


==Acute pancreatitis==
==Acute pancreatitis==
===General===
{{Main|Acute pancreatitis}}
*Rarely comes to pathology.
*Usually diagnosed by abdominal CT, blood work (amylase, lipase).
 
===Microscopic===
Features:<ref>{{Ref Klatt|223}}</ref>
*Loss of acini.
*Neutrophils.
*Hemorrhage.
*+/-Loss of pancreatic islets.


==Chronic pancreatitis==
==Chronic pancreatitis==
===General===
{{Main|Chronic pancreatitis}}
*May be confused with [[pancreatic ductal adenocarcinoma|ductal adenocarcinoma]] radiologically... and pathologically.
*Often due to [[ethanol abuse]].
 
Complications:<ref name=Ref_PCPBoD8_469>{{Ref PCPBoD8|469}}</ref>
*Malabsorption.
*[[Diabetes mellitus]].
*Pseudocysts.
 
====Autoimmune pancreatitis====
Histologic subtypes of autoimmune pancreatitis:<ref>URL: [http://path.upmc.edu/cases/case651/dx.html http://path.upmc.edu/cases/case651/dx.html]. Accessed on: 28 January 2012.</ref>
#Lymphoplasmacytic sclerosing pancreatitis (LPSP).
#*Typically IgG4 positive -- one of the ''[[IgG4-related systemic disease]]s''.
#**IgG4 negative cases reported.<ref name=pmid20824290/><ref name=pmid22466829>{{Cite journal  | last1 = Ikeura | first1 = T. | last2 = Takaoka | first2 = M. | last3 = Uchida | first3 = K. | last4 = Shimatani | first4 = M. | last5 = Miyoshi | first5 = H. | last6 = Kusuda | first6 = T. | last7 = Kurishima | first7 = A. | last8 = Fukui | first8 = Y. | last9 = Sumimoto | first9 = K. | title = Autoimmune pancreatitis with histologically proven lymphoplasmacytic sclerosing pancreatitis with granulocytic epithelial lesions. | journal = Intern Med | volume = 51 | issue = 7 | pages = 733-7 | month =  | year = 2012 | doi =  | PMID = 22466829 }}</ref>
#*Approximately 80% of cases.<ref name=pmid20824290>{{Cite journal  | last1 = Kamisawa | first1 = T. | last2 = Takuma | first2 = K. | last3 = Tabata | first3 = T. | last4 = Inaba | first4 = Y. | last5 = Egawa | first5 = N. | last6 = Tsuruta | first6 = K. | last7 = Hishima | first7 = T. | last8 = Sasaki | first8 = T. | last9 = Itoi | first9 = T. | title = Serum IgG4-negative autoimmune pancreatitis. | journal = J Gastroenterol | volume = 46 | issue = 1 | pages = 108-16 | month = Jan | year = 2011 | doi = 10.1007/s00535-010-0317-2 | PMID = 20824290 }}</ref>
#Idiopathic duct-centric chronic pancreatitis (IDCP).
#*Typically IgG4 negative.
#*Approximately 20% of cases.
 
=====Lymphoplasmacytic sclerosing pancreatitis=====
General:
*Serum IgG4 +ve.<ref name=pmid17533077>{{Cite journal  | last1 = Krasinskas | first1 = AM. | last2 = Raina | first2 = A. | last3 = Khalid | first3 = A. | last4 = Tublin | first4 = M. | last5 = Yadav | first5 = D. | title = Autoimmune pancreatitis. | journal = Gastroenterol Clin North Am | volume = 36 | issue = 2 | pages = 239-57, vii | month = Jun | year = 2007 | doi = 10.1016/j.gtc.2007.03.015 | PMID = 17533077 }}</ref>
Microscopic:
*Lymphoplasmacytic infiltrate.
IHC:
*Plasma cells IgG4 +ve.
 
===Radiology===
Plain film findings:
*Calcifications.
 
===Microscopic===
Features of chronic pancreatitis:<ref name=pmid16273946>{{Cite journal  | last1 = Adsay | first1 = NV. | last2 = Bandyopadhyay | first2 = S. | last3 = Basturk | first3 = O. | last4 = Othman | first4 = M. | last5 = Cheng | first5 = JD. | last6 = Klöppel | first6 = G. | last7 = Klimstra | first7 = DS. | title = Chronic pancreatitis or pancreatic ductal adenocarcinoma? | journal = Semin Diagn Pathol | volume = 21 | issue = 4 | pages = 268-76 | month = Nov | year = 2004 | doi =  | PMID = 16273946 }}</ref>
*Preservation of lobular architecture - evenly spaced ductal units.
*Uniformly sized ductal elements.
*Smooth ductal contours.
*Ducts surrounded by acini or islets.
**Islets usu. preserved better than acini.<ref name=Ref_Klatt225>{{Ref Klatt|225}}</ref>
*Intraluminal mucoprotein plugs.
 
Images:
*[http://path.upmc.edu/cases/case651.html Autoimmune pancreatitis / IgG4 sclerosing disease - several images (upmc.edu)].
 
====Adenocarcinoma versus pancreatitis====
This contrasts with the features of adenocarcinoma:<ref name=pmid16273946>{{Cite journal  | last1 = Adsay | first1 = NV. | last2 = Bandyopadhyay | first2 = S. | last3 = Basturk | first3 = O. | last4 = Othman | first4 = M. | last5 = Cheng | first5 = JD. | last6 = Klöppel | first6 = G. | last7 = Klimstra | first7 = DS. | title = Chronic pancreatitis or pancreatic ductal adenocarcinoma? | journal = Semin Diagn Pathol | volume = 21 | issue = 4 | pages = 268-76 | month = Nov | year = 2004 | doi =  | PMID = 16273946 }}</ref>
*Ductal architecture:
**Random distribution of ductal structures.
**Irregular ductal contours.
**"Naked ducts in fat"; ducts without surrounding pancreatic elements or fibrous tissue.
**Ducts adjacent to arterioles.
*Nuclear atypia:
**Enlargement (>3 times the size of a lymphocyte).
**Pleomorphism.
**Distinct [[nucleoli]].
**Hyperchromatic raisinoid nucleoli.
*Generally assoc. with malignancy:
**[[perineural invasion|Perineural]] and [[vascular invasion]] (rare).
**Mitosis.
**Necrotic cellular debris (intraluminal).
 
Notes:
*Memory device: ''give 'em a '''fair''' chance'' at a benign diagnosis. Features suggestive of malignant:
**Fat, adjacent to.
**Arteriole, adjacent to.
**Irregular ducts.
**Random distribution of ducts/non-lobular arrangement.
 
===IHC===
*IgG4 +ve plasma cells -- IgG4 sclerosing disease.
 
Positive in pancreatic carcinoma:<ref name=pmid15725808>{{Cite journal  | last1 = Hornick | first1 = JL. | last2 = Lauwers | first2 = GY. | last3 = Odze | first3 = RD. | title = Immunohistochemistry can help distinguish metastatic pancreatic adenocarcinomas from bile duct adenomas and hamartomas of the liver. | journal = Am J Surg Pathol | volume = 29 | issue = 3 | pages = 381-9 | month = Mar | year = 2005 | doi =  | PMID = 15725808 }}</ref>
*p53.
*Mesothelin.


=Cystic lesions - overview=
=Cystic lesions - overview=
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==Serous cystadenoma of the pancreas==
==Serous cystadenoma of the pancreas==
*[[AKA]] ''serous microcystic adenoma'',<ref name=Ref_Sternberg4_1630>{{Ref Sternberg4|1630}}</ref> [[AKA]] ''pancreatic serous cystadenoma''.
*[[AKA]] ''serous microcystic adenoma'',<ref name=Ref_Sternberg4_1630>{{Ref Sternberg4|1630}}</ref> [[AKA]] ''pancreatic serous cystadenoma''.
===General===
{{Main|Serous cystadenoma of the pancreas}}
*1-2% of all exocrine pancreatic tumours.
*Female > male.
*Mean age 66 years.
*Truly benign with no malignant potenial.
*May be part of [[von Hippel-Lindau syndrome]].
 
Management:
*Observe or resect.
 
===Gross===
Features:
*Classically has a characteristic central scar.<ref name=pmid15888617>{{cite journal |author=Kim YH, Saini S, Sahani D, Hahn PF, Mueller PR, Auh YH |title=Imaging diagnosis of cystic pancreatic lesions: pseudocyst versus nonpseudocyst |journal=Radiographics |volume=25 |issue=3 |pages=671–85 |year=2005 |pmid=15888617 |doi=10.1148/rg.253045104 |url=http://radiographics.rsna.org/content/25/3/671.abstract}}</ref>
*Bosulated surface.
*Lobulated.
*No (macroscopic) cysts apparent on gross.
*Location: 50-70% occur in the body and tail.
*Size: average size 11 cm.
 
Radiologic appearance:
*Honey comb-like appearance.
*Well demarcated border - may be described as a "coin lesion".
 
Image:
*[http://www.joplink.net/prev/200905/25_fig06.jpg Serous microcystic adenoma (joplink.net)].<ref name=pmid19454830>{{Cite journal  | last1 = Vernadakis | first1 = S. | last2 = Kaiser | first2 = GM. | last3 = Christodoulou | first3 = E. | last4 = Mathe | first4 = Z. | last5 = Troullinakis | first5 = M. | last6 = Bankfalvi | first6 = A. | last7 = Paul | first7 = A. | title = Enormous serous microcystic adenoma of the pancreas. | journal = JOP | volume = 10 | issue = 3 | pages = 332-4 | month =  | year = 2009 | doi =  | PMID = 19454830 |URL = http://www.joplink.net/prev/200905/25.html }}</ref>
 
===Microscopic===
Features:
*Cystic spaces lined by cuboidal cells.
**Glycogen rich.
**Cilia. (???)
 
DDx:
*[[Renal cell carcinoma]].
*[[Lymphangioma]].
*[[Hemangioma]].
*Oligocystic mucinous cystic tumors and pseudocysts.
**Have mucin; PAS-D could be used to demonstrate its presence.
 
Notes:
*Serous adenoma may coexist with aggressive tumours.
 
====Images====
<gallery>
Image:Pancreatic_serous_cystadenoma_-_low_mag.jpg | PSC - low mag. (WC)
Image:Pancreatic_serous_cystadenoma_-_intermed_mag.jpg | PSC - intermed. mag. (WC)
Image:Pancreatic_serous_cystadenoma_-_high_mag.jpg | PSC - high mag. (WC)
Image:Pancreatic_serous_cystadenoma_-_very_high_mag.jpg | PSC - very high mag. (WC)
</gallery>
 
===Stains===
*PAS +ve.
*PASD -ve.


==Mucinous cystic neoplasms of the pancreas==
==Mucinous cystic neoplasms of the pancreas==
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=====Images=====
=====Images=====
<gallery>
<gallery>
Image:Benign_pancreatic_mucinous_cystic_neoplasm_-_very_low_mag.jpg | Benign mucinous cystic neoplasm - very low mag. (WC)
Image:Benign_pancreatic_mucinous_cystic_neoplasm_-_low_mag.jpg | Benign mucinous cystic neoplasm - low mag.(WC)
Image:Benign_pancreatic_mucinous_cystic_neoplasm_-_intermed_mag.jpg | Benign mucinous cystic neoplasm - intermed. mag. (WC)
Image:Benign_pancreatic_mucinous_cystic_neoplasm_-_intermed_mag.jpg | Benign mucinous cystic neoplasm - intermed. mag. (WC)
Image:Benign_pancreatic_mucinous_cystic_neoplasm_-_high_mag.jpg | Benign mucinous cystic neoplasm - should stroma (WC)
Image:Benign_pancreatic_mucinous_cystic_neoplasm_-_high_mag.jpg | Benign mucinous cystic neoplasm - showing stroma - high mag. (WC)
</gallery>
</gallery>
www:
www:
*[http://radiology.uchc.edu/eAtlas/Images/GYN/5705b.gif Mucinous cystadenoma - ovary (uchc.edu)].
*[http://radiology.uchc.edu/eAtlas/Images/GYN/5705b.gif Mucinous cystadenoma - ovary (uchc.edu)].
[[File:4 477025809 sl 1.png|Mucinous cystic neoplasm of pancreas]]
[[File:4 477025809 sl 2.png|Mucinous cystic neoplasm of pancreas]]
[[File:4 477025809 sl 3.png|Mucinous cystic neoplasm of pancreas]]
[[File:4 477025809 sl 4.png|Mucinous cystic neoplasm of pancreas]]
[[File:4 477025809 sl 5.png|Mucinous cystic neoplasm of pancreas]]
[[File:4 477025809 sl 6.png|Mucinous cystic neoplasm of pancreas]]
[[File:4 477025809 sl 7.png|Mucinous cystic neoplasm of pancreas]]<br>
Benign mucinous cystic neoplasm of pancreas in a 62 year old woman. A. CT scan showed a peripherally calcified spheroidal mass at the tail of the pancreas. Cytology only showed debris and inflammatory cells, but CEA of the fluid was 2875.2 ng/mL. B. Almost all sections of the cyst showed acellular debris topping a fibrous, often calcified wall, consistent with a pseudocyst. C. Extensive sampling, undertaken because of the high CEA, revealed rare sections with a lining. D. Lining nuclei are bland, with even chromatin. Shape and size variation, as well as darkening when shrunken, are all explicable by degeneration. E. Within distal pancreas, a focus of changes of chronic pancreatitis is seen upper left, while a pancreatic duct in lower right shows an intraductal proliferation. F. Tumor cells show mucinous vacuoles, with better preserved nuclei.  Nuclear appearances remain bland. G. Cellular ovarian stroma appeared beneath epithelium of a separate focus of the cystic neoplasm.


====Borderline mucinous cystic tumour====
====Borderline mucinous cystic tumour====
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|Viscosity || high || low
|Viscosity || high || low
|-
|-
|CEA, CA125 || high || low       
|[[CEA]], CA125 || high || low       
|}
|}


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*Abbreviated ''IPMT''.
*Abbreviated ''IPMT''.
*[[AKA]] ''intraductal papillary mucinous neoplasm'', abbreviated ''IPMN''.
*[[AKA]] ''intraductal papillary mucinous neoplasm'', abbreviated ''IPMN''.
===General===
{{Main|Intraductal papillary mucinous tumour}}
*Morphologically and biologically distinct from ductal adenocarcinoma, mucinous cystic tumour and ductal papillary hyperplasia.
*Prognosis:
**Favourable if caught early; not much different than ductal adenocarcinoma if caught late.<ref name=pmid12377813>{{cite journal |author=Maire F, Hammel P, Terris B, ''et al.'' |title=Prognosis of malignant intraductal papillary mucinous tumours of the pancreas after surgical resection. Comparison with pancreatic ductal adenocarcinoma |journal=Gut |volume=51 |issue=5 |pages=717–22 |year=2002 |month=November |pmid=12377813 |pmc=1773420 |doi= |url=http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pubmed&pubmedid=12377813}}</ref>
**Dependent what is involved:<ref name=pmid20374620>{{cite journal |author=Baiocchi GL, Portolani N, Missale G, ''et al.'' |title=Intraductal papillary mucinous neoplasm of the pancreas (IPMN): clinico-pathological correlations and surgical indications |journal=World J Surg Oncol |volume=8 |issue= |pages=25 |year=2010 |pmid=20374620 |pmc=2858722 |doi=10.1186/1477-7819-8-25 |url=http://wjso.com/content/8/1/25}}</ref>
***Main duct (bad prognosis).
***Branch (good prognosis).
 
Clinical:
*Patient usually not jaundiced... as no obstruction.
*Often diabetes... as pancreas is destroyed.
*Patients may get a total pancreatectomy - as the disease is often multifocal.
 
====Epidemiology====
*~1% of all exocrine pancreatic tumours.
*More common in males.
*Mean age at presentation 62 years.
*60-80% occur in the head of the pancreas.
*Average size 4 cm.
 
===Gross===
*May be patchy/multifocal.
*Multiple cystic spaces.
 
===Microscopic===
Features:
*Pancreatic duct lining cells jut into the duct lumen - papillomatous growth pattern.
*Cytology:
**Cell enlargement.
***Increased mucin production.
**Nuclear changes:
***Increased [[NC ratio]].
***Nuclear crowding and [[nuclear pleomorphism|pleomorphism]].
**Mitotic activity.
 
Note:
*No ovarian type stroma underneath (as seen in mucinous tumours).
 
DDx:
*[[PanIN]].
*[[Invasive ductal carcinoma of the pancreas]].
*Intra-ampullary papillary-tubular neoplasm -- see ''[[ampulla of Vater]]''.
 
====Classification of IMPT====
Commonly classified by the duct involvement:<ref name=pmid20397268>{{Cite journal  | last1 = Ikeuchi | first1 = N. | last2 = Itoi | first2 = T. | last3 = Sofuni | first3 = A. | last4 = Itokawa | first4 = F. | last5 = Tsuchiya | first5 = T. | last6 = Kurihara | first6 = T. | last7 = Ishii | first7 = K. | last8 = Tsuji | first8 = S. | last9 = Umeda | first9 = J. | title = Prognosis of cancer with branch duct type IPMN of the pancreas. | journal = World J Gastroenterol | volume = 16 | issue = 15 | pages = 1890-5 | month = Apr | year = 2010 | doi =  | PMID = 20397268 PMC = 2856831 | URL = http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2856831/}}</ref>
#Main duct type.
#*Commonly associated with invasive carcinoma.
#Branch duct type.
#*Less commonly associated with invasive carcinoma.
 
=====Behaviour - Khalifa=====
*Adenoma.
*Borderline mucinous tumour.
*Carcinoma.
 
Notes:
*Borderline tumours are rare.
*If intralobular dilated ducts... carcinoma.
*Any margin with mucin cells in thought to be badness!


==Solid pseudopapillary tumour==
==Solid pseudopapillary tumour==
*[[AKA]] ''solid pseudopapillary neoplasm'', abbreviation ''SPN''.
*[[AKA]] ''solid pseudopapillary neoplasm'', abbreviation ''SPN''.
*[[AKA]] ''solid and papillary epithelial neoplasm'', abbreviated ''SPEN''.<ref>URL: [http://brighamrad.harvard.edu/Cases/bwh/hcache/360/full.html http://brighamrad.harvard.edu/Cases/bwh/hcache/360/full.html]. Accessed on: 31 October 2011.</ref>
*[[AKA]] ''solid and papillary epithelial neoplasm'', abbreviated ''SPEN''.<ref>URL: [http://brighamrad.harvard.edu/Cases/bwh/hcache/360/full.html http://brighamrad.harvard.edu/Cases/bwh/hcache/360/full.html]. Accessed on: 31 October 2011.</ref>
 
{{Main|Solid pseudopapillary tumour}}
===General===
*Obscure cell of origin.
*Considered low grade, i.e. prognosis is usually good.
 
====Epidemiology====
Features:<ref name=Ref_GLP493>{{Ref GLP|493}}</ref>
*Usually females (M:F=1:9).
*Mean age of presentation third decade (20s).
 
====Management====
May be followed radiologically.
 
===Microscopic===
Features:<ref>{{Ref GLP|493-5}}</ref>
*Solid sheets of cells, focally dyscohesive.
*Eosinophilic cytoplasm.
**Occasionally clear cytoplasm.<ref name=pmid18708424>{{cite journal |author=Serra S, Chetty R |title=Revision 2: an immunohistochemical approach and evaluation of solid pseudopapillary tumour of the pancreas |journal=J. Clin. Pathol. |volume=61 |issue=11 |pages=1153–9 |year=2008 |month=November |pmid=18708424 |doi=10.1136/jcp.2008.057828 |url=http://jcp.bmj.com/content/61/11/1153}}</ref>
**Focal eosinophilic (intracytoplasmic) globules - '''key feature'''.
*Uniform nuclei with occasional nuclear grooves.
*+/-Necrosis - creating spaces/cavities.
*+/-Cholesterol clefts.<ref name=pmid19156179>{{Cite journal  | last1 = Abad Licham | first1 = M. | last2 = Sanchez Lihon | first2 = J. | last3 = Celis Zapata | first3 = J. | title = [Pseudopapillary solid tumor of pancreas in the INEN]. | journal = Rev Gastroenterol Peru | volume = 28 | issue = 4 | pages = 356-61 | month =  | year =  | doi =  | PMID = 19156179 }}</ref>
 
====Images====
<gallery>
Image:Solid_pseudopapillary_tumour_-_low_mag.jpg | SPT - low mag. (WC)
Image:Solid_pseudopapillary_tumour_-_high_mag.jpg | SPT - high mag. (WC)
Image:Solid_pseudopapillary_tumour_-_very_high_mag.jpg | SPT - very high mag. (WC)
</gallery>
www:
*[http://jcp.bmj.com/content/61/11/1153/F1.large.jpg Solid pseudopapillary tumour (bmj.com)].
 
====DDx====
*[[Pancreatic pseudocyst]].
*Cystadenoma.
*Cystadenocarcinoma.
*[[Pancreatic neuroendocrine tumour]] - may have cytoplasmic vacuolation, [[hyaline globules]].<ref name=pmid18708424/>
 
===IHC===
Features:<ref name=pmid18708424>{{cite journal |author=Serra S, Chetty R |title=Revision 2: an immunohistochemical approach and evaluation of solid pseudopapillary tumour of the pancreas |journal=J. Clin. Pathol. |volume=61 |issue=11 |pages=1153–9 |year=2008 |month=November |pmid=18708424 |doi=10.1136/jcp.2008.057828 |url=http://jcp.bmj.com/content/61/11/1153}}</ref>
*Beta-catenin +ve ~100% (cytoplasmic & nuclear).
*E-cadherin +ve ~100% (cytoplasmic), -ve (membrane); antibody dependent.
*CD10 +ve ~ 80% (cytoplasmic + dot-like) '''key'''.
*Synaptophysin +ve (weak cytoplasmic) ~70%.
*Progesterone receptor +ve (nuclear) '''key'''.
 
Others:
*CD56 +ve.
*Chromogranin -ve.
 
Memory device ''PCB'': '''P'''R (nuclear), '''C'''D10 (cytoplasmic), '''b'''eta-catenin (cytoplasmic & nuclear).


=Pre-malignant lesions=
=Pre-malignant lesions=
==Pancreatic intraepithelial neoplasia==
==Pancreatic intraepithelial neoplasia==
*Abbreviated ''PanIN''.
*Abbreviated ''PanIN''.
 
{{Main|Pancreatic intraepithelial neoplasia}}
===General===
*PanIN is thought to be the precursor lesion for pancreatic carcinoma.<ref name=Ref_PBoD949>{{Ref PBoD|949}}</ref>
 
====Overview====
Putative preneoplasm-neoplasm-carcinoma sequence:
*PanIN1a.
**Not neoplastic, i.e. clonal.
*PanIN1b.
**Not neoplastic, i.e. clonal.
*PanIN2.
**Can be thought of as ''low-grade dysplasia'', e.g. a ''(colonic) [[tubular adenoma of the gastrointestinal tract|tubular adenoma]] without high-grade dysplasia''.
*PanIN3.
**Can be thought of as ''high-grade dysplasia'', e.g. ''(colonic) villous adenoma''.
**May be referred to as ''carcinoma in situ''.<ref name=pmid21537863>{{Cite journal  | last1 = Matthaei | first1 = H. | last2 = Hong | first2 = SM. | last3 = Mayo | first3 = SC. | last4 = dal Molin | first4 = M. | last5 = Olino | first5 = K. | last6 = Venkat | first6 = R. | last7 = Goggins | first7 = M. | last8 = Herman | first8 = JM. | last9 = Edil | first9 = BH. | title = Presence of pancreatic intraepithelial neoplasia in the pancreatic transection margin does not influence outcome in patients with R0 resected pancreatic cancer. | journal = Ann Surg Oncol | volume = 18 | issue = 12 | pages = 3493-9 | month = Nov | year = 2011 | doi = 10.1245/s10434-011-1745-9 | PMID = 21537863 }}</ref>
 
===Microscopic===
Features:<ref name=Ref_PBoD949>{{Ref PBoD|949}}</ref>
*PanIN1a - increased amount of cytoplasm.
**Nuclear size & stratification perserved, arch. perserved.
*PanIN1b - increased amount of cytoplasm, folding of epithelium/moderated arch. distortion.
**Nuclear size & stratification perserved.
*PanIN2 - increased cell size, and nuclear enlargement (increased NC ratio), moderate nuclear atypia with loss of (basal) nuclear polarization.
*PanIN3 - marked nuclear atypia with increased NC ratio.
**No invasion identified.
*Pancreatic carcinoma - cytologic features of PanIN3 with definite invasion.
 
====Images====
<gallery>
Image:Pancreas_neoplasia_carcinoma_sequence.png | Normal pancreas, pancreatic intraepithelial neoplasia and pancreatic carcinoma. (WC)
</gallery>
www:
*[http://www.path.jhu.edu/pancreas/professionals/panin-3.php PanIN III - several images (jhu.edu)].


=Solid tumours=
=Solid tumours=
Line 732: Line 485:
*[[AKA]] ''pancreatic ductal adenocarcinoma''.
*[[AKA]] ''pancreatic ductal adenocarcinoma''.
*[[AKA]] ''pancreatic adenocarcinoma''.
*[[AKA]] ''pancreatic adenocarcinoma''.
===General===
{{Main|Invasive ductal carcinoma of the pancreas}}
*Most common type of pancreatic cancer.<ref name=Ref_WMSP>{{Ref WMSP|237}}</ref>
*Location: usually in the head ~60%.
**15% in the body, 5% tail, 20% diffuse (head, body & tail).<ref name=Ref_PBoD950>{{Ref PBoD|950}}</ref>
*Abysmal prognosis.
 
Risk factors:<ref name=Ref_PCPBoD8_471>{{Ref PCPBoD8|471}}</ref>
*Smoking (RR ~ 2).
*Pancreatitis.
*Family history, esp. BRCA2.
*[[Diabetes mellitus]] - modest risk increase.
 
Molecular characteristics:<ref name=Ref_PCPBoD8_470-1>{{Ref PCPBoD8|470-1}}</ref><ref name=pmid19896096>{{Cite journal  | last1 = Furukawa | first1 = T. | title = Molecular pathology of pancreatic cancer: implications for molecular targeting therapy. | journal = Clin Gastroenterol Hepatol | volume = 7 | issue = 11 Suppl | pages = S35-9 | month = Nov | year = 2009 | doi = 10.1016/j.cgh.2009.07.035 | PMID = 19896096 }}</ref>
#KRAS (oncogene) mutation in ~ 90% of cases.
#CDKN2A<ref name=omim600160>{{OMIM|600160}}</ref> ([[AKA]] p16) inactivation ~ 95% of cases.
#TP53 (AKA p53).
#SMAD4.
 
===Microscopic===
Features:<ref name=Ref_PBoD951>{{Ref PBoD|951}}</ref>
*Often glandular, may be solid.
*Nuclei.
**May be bland - little pleomorphism.
**Often small nuclei.
**Sometimes [[coffee-bean nuclei|coffee-bean]] appearance.
*Cytoplasm - granular, abundant.
*Quasi endocrine look.
**May stain positive for endocrine markers.
 
Other features:
*+/-Necrosis.
*+/-Myxoid degeneration.
*+/-Cells around vessels.
 
DDx:
*[[Chronic pancreatitis]].<ref name=pmid16273946>{{Cite journal  | last1 = Adsay | first1 = NV. | last2 = Bandyopadhyay | first2 = S. | last3 = Basturk | first3 = O. | last4 = Othman | first4 = M. | last5 = Cheng | first5 = JD. | last6 = Klöppel | first6 = G. | last7 = Klimstra | first7 = DS. | title = Chronic pancreatitis or pancreatic ductal adenocarcinoma? | journal = Semin Diagn Pathol | volume = 21 | issue = 4 | pages = 268-76 | month = Nov | year = 2004 | doi =  | PMID = 16273946 }}</ref>
*[[Cholangiocarcinoma]].
 
Images:
*[http://commons.wikimedia.org/wiki/File:Pancreas_adenocarcinoma_(3)_Case_01.jpg Pancreatic adenocarcinoma (WC)].
*[http://commons.wikimedia.org/wiki/File:Pancreas_adenocarcinoma_(2)_Case_01.jpg Pancreatic adenocarcinoma (WC)].
*[http://commons.wikimedia.org/wiki/File:Pancreas_neoplasia_carcinoma_sequence.png Normal pancreas, pancreatic intraepithelial neoplasia and pancreatic carcinoma (WC)].
*[http://commons.wikimedia.org/wiki/File:Pancreas_FNA;_adenocarcinoma_vs._normal_ductal_epithelium_(200x).jpg?uselang=de Pancreatic adenocarcinoma - cytopathology (WC)].
*[http://path.upmc.edu/cases/case384.html Pancreatic adenocarcinoma - several images (upmc.edu)].
 
===IHC===
Features:<ref name=Ref_Lester3>{{Ref Lester3|94}}</ref>
*CD7 +ve.
*CD20 +ve.
*SMAD4 -ve ~55% of cases -- stomach usually +ve.
*CDX2 -ve/+ve.
*CEA +ve.<ref name=pmid16183479>{{Cite journal  | last1 = Adsay | first1 = NV. | last2 = Basturk | first2 = O. | last3 = Cheng | first3 = JD. | last4 = Andea | first4 = AA. | title = Ductal neoplasia of the pancreas: nosologic, clinicopathologic, and biologic aspects. | journal = Semin Radiat Oncol | volume = 15 | issue = 4 | pages = 254-64 | month = Oct | year = 2005 | doi = 10.1016/j.semradonc.2005.04.001 | PMID = 16183479 }}</ref>


==Pancreatic neuroendocrine tumour==
==Pancreatic neuroendocrine tumour==
{{Main|Neuroendocrine tumour}}
*Abbreviated ''PanNET''.<ref name=pmid22198808/>
*Abbreviated ''PanNET''.<ref name=pmid22198808/>
*[[AKA]] ''pancreatic islet cell tumour''<ref name=pmid22198808>{{Cite journal  | last1 = Burns | first1 = WR. | last2 = Edil | first2 = BH. | title = Neuroendocrine Pancreatic Tumors: Guidelines for Management and Update. | journal = Curr Treat Options Oncol | volume =  | issue =  | pages =  | month = Dec | year = 2011 | doi = 10.1007/s11864-011-0172-2 | PMID = 22198808 }}</ref> - considered to be an outdated term.
*[[AKA]] ''pancreatic islet cell tumour''<ref name=pmid22198808>{{Cite journal  | last1 = Burns | first1 = WR. | last2 = Edil | first2 = BH. | title = Neuroendocrine Pancreatic Tumors: Guidelines for Management and Update. | journal = Curr Treat Options Oncol | volume =  | issue =  | pages =  | month = Dec | year = 2011 | doi = 10.1007/s11864-011-0172-2 | PMID = 22198808 }}</ref> - considered to be an outdated term.
*[[AKA]] ''islet cell tumour'' - considered to be an outdated term.
*[[AKA]] ''islet cell tumour'' - considered to be an outdated term.
 
{{Main|Neuroendocrine tumour of the pancreas}}
===General===
*Rare.
*Presentation depends on subtype, e.g. for ''insulinoma'' the typical presentation is hypoglycemia.
*May be part of a syndrome:
**[[MEN 1|Multiple endocrine neoplasia I]].
**[[Von Hippel-Lindau disease]].<ref name=pmid22370733>{{Cite journal  | last1 = Charlesworth | first1 = M. | last2 = Verbeke | first2 = CS. | last3 = Falk | first3 = GA. | last4 = Walsh | first4 = M. | last5 = Smith | first5 = AM. | last6 = Morris-Stiff | first6 = G. | title = Pancreatic Lesions in von Hippel-Lindau Disease? A Systematic Review and Meta-synthesis of the Literature. | journal = J Gastrointest Surg | volume =  | issue =  | pages =  | month = Feb | year = 2012 | doi = 10.1007/s11605-012-1847-0 | PMID = 22370733 }}</ref>
**[[Neurofibromatosis type 1]].<ref name=pmid15249710>{{Cite journal  | last1 = Alexakis | first1 = N. | last2 = Connor | first2 = S. | last3 = Ghaneh | first3 = P. | last4 = Lombard | first4 = M. | last5 = Smart | first5 = HL. | last6 = Evans | first6 = J. | last7 = Hughes | first7 = M. | last8 = Garvey | first8 = CJ. | last9 = Vora | first9 = J. | title = Hereditary pancreatic endocrine tumours. | journal = Pancreatology | volume = 4 | issue = 5 | pages = 417-33; discussion 434-5 | month =  | year = 2004 | doi = 10.1159/000079616 | PMID = 15249710 }}</ref>
 
====Classification====
Based on peptide produced in the pancreatic islets:
#Glucagon from alpha cells ([[glucagonoma]]).
#Insulin from beta cells (insulinoma) - most common ~ 50% of islet cell tumours.
#Somatostatin from D cells ([[somatostatinoma]]).
#Pancreatic polypeptide from PP cells.
 
Others:
#Vasoactive intestinal peptide (VIPoma).
#Gastrin (gastrinoma).
#*May be seen in ''[[Zollinger-Ellison syndrome]]''.
#**Triad: pancreatic gastrinoma, gastric acid hypersecretion, marked peptic ulcers in the small bowel.<ref name=pmid13259432>{{cite journal |author=Zollinger RM, Ellison EH |title=Primary peptic ulcerations of the jejunum associated with islet cell tumors of the pancreas |journal=Ann. Surg. |volume=142 |issue=4 |pages=709–23; discussion, 724–8 |year=1955 |pmid=13259432|doi=10.1097/00000658-195510000-00015 |PMC = 1465210 |URL = http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1465210/?page=1 }}</ref>
 
===Gross===
*Usually in the head of the pancreas - 68% in one series,<ref name=pmid22869477>{{Cite journal  | last1 = Oh | first1 = TG. | last2 = Chung | first2 = MJ. | last3 = Park | first3 = JY. | last4 = Bang | first4 = SM. | last5 = Park | first5 = SW. | last6 = Chung | first6 = JB. | last7 = Song | first7 = SY. | title = Prognostic factors and characteristics of pancreatic neuroendocrine tumors: single center experience. | journal = Yonsei Med J | volume = 53 | issue = 5 | pages = 944-51 | month = Sep | year = 2012 | doi = 10.3349/ymj.2012.53.5.944 | PMID = 22869477 | PMC = 3423842}}</ref> and 50% in another series.<ref name=pmid22869477>{{Cite journal  | last1 = Oh | first1 = TG. | last2 = Chung | first2 = MJ. | last3 = Park | first3 = JY. | last4 = Bang | first4 = SM. | last5 = Park | first5 = SW. | last6 = Chung | first6 = JB. | last7 = Song | first7 = SY. | title = Prognostic factors and characteristics of pancreatic neuroendocrine tumors: single center experience. | journal = Yonsei Med J | volume = 53 | issue = 5 | pages = 944-51 | month = Sep | year = 2012 | doi = 10.3349/ymj.2012.53.5.944 | PMID = 22869477 }}</ref>
 
===Microscopic===
Features:
*Nests of cells.
*Stippled chromatin.
*+/-Hyaline globules.
 
DDx:
*[[Solid pseudopapillary neoplasm]].
*[[Acinar cell carcinoma]].
 
Images:
*[http://path.upmc.edu/cases/case172/micro.html Islet cell tumour (upmc.edu)].
*[http://path.upmc.edu/cases/case339.html Pancreatic NET with features of SPT (upmc.edu)].
*[http://path.upmc.edu/cases/case501.html Pancreatic NET - another case (upmc.edu)].
===IHC===
*CK19 +ve -- should be done as a routine in pancreatic NETs; poor prognostic factor.<ref name=pmid19956064>{{Cite journal  | last1 = Jain | first1 = R. | last2 = Fischer | first2 = S. | last3 = Serra | first3 = S. | last4 = Chetty | first4 = R. | title = The use of Cytokeratin 19 (CK19) immunohistochemistry in lesions of the pancreas, gastrointestinal tract, and liver. | journal = Appl Immunohistochem Mol Morphol | volume = 18 | issue = 1 | pages = 9-15 | month = Jan | year = 2010 | doi = 10.1097/PAI.0b013e3181ad36ea | PMID = 19956064 }}</ref>
 
Note:
*''CK19'' should '''not''' be confused with ''CA19-9''.


==Acinar cell carcinoma of the pancreas==
==Acinar cell carcinoma of the pancreas==
Line 839: Line 497:
*[[AKA]] ''acinar cell carcinoma''.
*[[AKA]] ''acinar cell carcinoma''.
*[[AKA]] ''pancreatic acinar cell carcinoma''.<ref name=pmid>{{Cite journal  | last1 = Thomas | first1 = PC. | last2 = Nash | first2 = GF. | last3 = Aldridge | first3 = MC. | title = Pancreatic acinar cell carcinoma presenting as acute pancreatitis. | journal = HPB (Oxford) | volume = 5 | issue = 2 | pages = 111-3 | month =  | year = 2003 | doi = 10.1080/13651820310001153 | PMID = 18332967 }}</ref>
*[[AKA]] ''pancreatic acinar cell carcinoma''.<ref name=pmid>{{Cite journal  | last1 = Thomas | first1 = PC. | last2 = Nash | first2 = GF. | last3 = Aldridge | first3 = MC. | title = Pancreatic acinar cell carcinoma presenting as acute pancreatitis. | journal = HPB (Oxford) | volume = 5 | issue = 2 | pages = 111-3 | month =  | year = 2003 | doi = 10.1080/13651820310001153 | PMID = 18332967 }}</ref>
 
{{Main|Acinar cell carcinoma of the pancreas}}
===General===
*Rare.
*Solid epithelial exocrine tumour.<ref>URL: [http://brighamrad.harvard.edu/Cases/bwh/hcache/380/full.html http://brighamrad.harvard.edu/Cases/bwh/hcache/380/full.html]. Accessed on: 15 January 2012.</ref>
*Poor prognosis; mean survival of 18 months in one series.<ref name=pmid1384374/>
 
Clinical:<ref name=pmid1384374>{{Cite journal  | last1 = Klimstra | first1 = DS. | last2 = Heffess | first2 = CS. | last3 = Oertel | first3 = JE. | last4 = Rosai | first4 = J. | title = Acinar cell carcinoma of the pancreas. A clinicopathologic study of 28 cases. | journal = Am J Surg Pathol | volume = 16 | issue = 9 | pages = 815-37 | month = Sep | year = 1992 | doi =  | PMID = 1384374 }}</ref>
*Increased serum lipase.
**Associated with arthralgias (joint pain).
*Classic presentation - Schmid triad:<ref name=pmid20168061>{{Cite journal  | last1 = Jang | first1 = SH. | last2 = Choi | first2 = SY. | last3 = Min | first3 = JH. | last4 = Kim | first4 = TW. | last5 = Lee | first5 = JA. | last6 = Byun | first6 = SJ. | last7 = Lee | first7 = JW. | title = [A case of acinar cell carcinoma of pancreas, manifested by subcutaneous nodule as initial clinical symptom]. | journal = Korean J Gastroenterol | volume = 55 | issue = 2 | pages = 139-43 | month = Feb | year = 2010 | doi =  | PMID = 20168061 }}</ref>
*#Subcutaneous [[fat necrosis]].
*#Polyarthritis.
*#Eosinophilia.
 
===Gross===
*Usually head of pancreas.
 
===Microscopic===
Features:<ref name=pmid1384374/>
*Cells reminiscent of pancreatic acinus cells:
**Granular, basophilic cytoplasm - usu. abundant.
**Round/oval nucleus.
***Nucleolus prominent.
*Architecture:
**Nests, sheets, trabecular, glandular.
 
DDx:
*[[Pancreatic neuroendocrine tumour]].
*[[Invasive ductal carcinoma of the pancreas]].
 
====Images====
<gallery>
Image:Acinar_cell_carcinoma_of_the_pancreas_-_high_mag.jpg | Pancreatic acinar cell carcinoma - high mag. (WC/Nephron)
Image:Acinar_cell_carcinoma_of_the_pancreas_-_very_high_mag.jpg | Pancreatic acinar cell carcinoma - very high mag. (WC/Nephron)
</gallery>
www:
*[http://path.upmc.edu/cases/case377.html Acinar cell carcinoma - several images (upmc.edu)].
*[http://brighamrad.harvard.edu/Cases/bwh/hcache/380/full.html Acinar cell carcinoma - several images (harvard.edu)].
*[http://www.nature.com/modpathol/journal/v20/n1s/fig_tab/3800686f12.html#figure-title Acinar cell carcinoma - 1 (nature.com)].
*[http://www.nature.com/modpathol/journal/v20/n1s/fig_tab/3800686f13.html#figure-title Acinar cell carcinoma - 2 (nature.com)].<ref name=pmid17486055>{{Cite journal  | last1 = Klimstra | first1 = DS. | title = Nonductal neoplasms of the pancreas. | journal = Mod Pathol | volume = 20 Suppl 1 | issue =  | pages = S94-112 | month = Feb | year = 2007 | doi = 10.1038/modpathol.3800686 | PMID = 17486055 }}</ref>
===Stains===
Features:<ref name=pmid1384374/>
*PAS +ve (granular).
*PASD +ve.
 
===IHC===
*Trypsin +ve -- '''key stain'''.
*Lipase +ve.
*Chromogranin +ve (scattered, focal).
*CD56 -ve. (?)


==Pancreatoblastoma==
==Pancreatoblastoma==
===General===
{{Main|Pancreatoblastoma}}
*Very rare.
*Tumour of childhood - age of diagnosis ~5 years old.<ref name=pmid22525406>{{Cite journal  | last1 = Glick | first1 = RD. | last2 = Pashankar | first2 = FD. | last3 = Pappo | first3 = A. | last4 = Laquaglia | first4 = MP. | title = Management of pancreatoblastoma in children and young adults. | journal = J Pediatr Hematol Oncol | volume = 34 Suppl 2 | issue =  | pages = S47-50 | month = May | year = 2012 | doi = 10.1097/MPH.0b013e31824e3839 | PMID = 22525406 }}</ref>
*Prognosis ~80% year survival in children<ref name=pmid21696948>{{Cite journal  | last1 = Bien | first1 = E. | last2 = Godzinski | first2 = J. | last3 = Dall'igna | first3 = P. | last4 = Defachelles | first4 = AS. | last5 = Stachowicz-Stencel | first5 = T. | last6 = Orbach | first6 = D. | last7 = Bisogno | first7 = G. | last8 = Cecchetto | first8 = G. | last9 = Warmann | first9 = S. | title = Pancreatoblastoma: a report from the European cooperative study group for paediatric rare tumours (EXPeRT). | journal = Eur J Cancer | volume = 47 | issue = 15 | pages = 2347-52 | month = Oct | year = 2011 | doi = 10.1016/j.ejca.2011.05.022 | PMID = 21696948 }}</ref> more aggressive in adults.
*May be seen in adults.<ref name=pmid22572137>{{Cite journal  | last1 = Balasundaram | first1 = C. | last2 = Luthra | first2 = M. | last3 = Chavalidthamrong | first3 = D. | last4 = Chow | first4 = J. | last5 = Khan | first5 = H. | last6 = Endres | first6 = PJ. | title = Pancreatoblastoma: a rare tumor still evolving in clinical presentation and histology. | journal = JOP | volume = 13 | issue = 3 | pages = 301-3 | month = May | year = 2012 | doi =  | PMID = 22572137 }}</ref>
 
Associations:<ref name=pmid17228135/>
*[[Beckwith-Wiedemann syndrome]].
*[[Familial adenomatous polyposis]].
 
===Microscopic===
Features:<ref name=pmid17228135>{{Cite journal  | last1 = Saif | first1 = MW. | title = Pancreatoblastoma. | journal = JOP | volume = 8 | issue = 1 | pages = 55-63 | month =  | year = 2007 | doi =  | PMID = 17228135 }}</ref><ref name=pmid15943785/>
*Acinar-like structures.
*Squamoid corpuscles.
*Undifferentiated component.
 
Image:
*[http://www.nature.com/modpathol/journal/v20/n1s/fig_tab/3800686f16.html#figure-title Pancreatoblastoma (nature.com)].<ref name=pmid17486055>{{Cite journal  | last1 = Klimstra | first1 = DS. | title = Nonductal neoplasms of the pancreas. | journal = Mod Pathol | volume = 20 Suppl 1 | issue =  | pages = S94-112 | month = Feb | year = 2007 | doi = 10.1038/modpathol.3800686 | PMID = 17486055 }}</ref>
 
===IHC===
Features:<ref name=pmid15943785>{{Cite journal  | last1 = Nishimata | first1 = S. | last2 = Kato | first2 = K. | last3 = Tanaka | first3 = M. | last4 = Ijiri | first4 = R. | last5 = Toyoda | first5 = Y. | last6 = Kigasawa | first6 = H. | last7 = Ohama | first7 = Y. | last8 = Nakatani | first8 = Y. | last9 = Notohara | first9 = K. | title = Expression pattern of keratin subclasses in pancreatoblastoma with special emphasis on squamoid corpuscles. | journal = Pathol Int | volume = 55 | issue = 6 | pages = 297-302 | month = Jun | year = 2005 | doi = 10.1111/j.1440-1827.2005.01829.x | PMID = 15943785 }}</ref>
*CK7 +ve -- acinar, undifferentiated component.
*CK8 +ve -- squamous component.
*CK18 +ve -- squamous component.
*CK19 +ve -- squamous component.


=See also=
=See also=

Latest revision as of 18:19, 7 December 2020

A drawing of the pancreas. (WC/Gray's Anatomy)

The pancreas hangs-out in the upper abdomen. It occasionally is afflicited by cancers, the most common of which is very fatal.

Pancreatic cytopathology is dealt with in the gastrointestinal cytopathology article.

A general introduction to gastrointestinal pathology is in the gastrointestinal pathology article.

Introduction

Normal anatomy

Divided into three portions: head, body & tail:[1]

  • Head:
    • Includes unicate process.
    • Extends to the left edge of the superior mesenteric vein (SMV) - by definition.
      • All of the SMV is with the head.
  • Body:
    • Right edge of the superior mesenteric vein to the left edge of aorta - by definition.
      • All of the aorta is with the body.
  • Tail:
    • Remainder of pancreas.

Pancreatic surgeries

Common pancreatic surgeries include:

  • Whipple procedure (AKA pancreaticoduodenal resection) - includes duodenum and usually the distal stomach (antrum).
  • Distal pancreatectomy.
  • Total pancreatectomy.
    • Specimen usually comes with the spleen.

Whipple procedure

  • AKA pancreaticoduodenectomy.

Indications:

  • Head of pancreas lesions, duodenal lesions.

Margins:[2]

  1. Proximal mucosal margin (stomach or duodenum).
  2. Distal mucosal margin (duodenum or jejunum).
  3. Bile duct margin.
  4. Pancreatic retroperitoneal (uncinate process) margin.
    • At SB done on edge (not en face).
  5. Pancreatic neck transection margin (AKA distal pancreatic resection margin);[3] usu. en face and in toto.[4]
  6. Sometimes superior mesenteric vein (SMV).
  7. Rarely superior mesenteric artery (SMA) margin.

Opening:

  1. Open the proximal (stomach) and distal (small bowel) stappled margins.
  2. Open the duodenum along it length on the anterior aspect.
  3. Open the stomach along the greater curvature.
  4. Join the cuts that open the stomach and duodenum.

General classification of pancreatic tumours

  • Metstatses.
    • Most common = renal cell carcinoma.
  • Primary.
    • Endocrine.
      • Usually small as hormonally active.
    • Exocrine.

Pancreas neoplasms in a table

Type Key feature Subtypes Image IHC Detailed microscopic Usual location Other DDx
Serous tumours cuboidal cells, clear cytoplasm cystadenoma, borderline t., cystadenocarcinoma [1], (WC), (WC) IHC? cuboidal cells, clear cytoplasm, central nucleus body or tail cystadenoma may be assoc. with von Hippel-Lindau syndrome clear cell RCC, oligomucinous mucinous tumours
Intraductal papillary mucinous tumour (IPMT) mucin, no ovarian-like stroma clear cell variant (wjso.com), (upmc.edu) IHC? papillae, tall columnar mucin-producing cells head - mucious neoplasms (other pancreatic, duodenal), intra-ampullary papillary-tubular neoplasm (see ampullary carcinoma)
Mucinous tumour mucin, ovarian-like stroma cystadenoma, borderline t., cystadenocarcinoma (WC), (WC) IHC? tall columnar mucin-producing cells, ovarian-like stroma body or tail - IPMT, metastatic mucinous tumours
Solid pseudopapillary
tumour 		eosinophilic intracytoplasmic globules clear cell variant (cytoplasm clear) (WC), (bmj.com) beta-catenin +ve, E-cadherin +ve,
synaptophysin +ve, chromogranin -ve 		sheets of cells, focally loosely cohesive, eosinophilic cytoplasm, uniform nuclei with grooves none (head, body or tail) usu. younger women ductal adenocarcinoma, neuroendocrine tumours
Ductal adenocarcinoma irregular shaped glands, cytologic atypia mucinous, spindle cell, mixed ductal-endocrine (WC), (WC) IHC? glands, sheets, single cells, nuc. atypia, +/-mitoses, +/-necrosis head arises from the precursor PanIN ampullary carcinoma, chronic pancreatitis
Pancreatoblastoma squamoid nests, whorling - (nature.com) CK7 (acinar comp.), CK8, CK18, CK19 squamoid nests of cells, whorling, nested growth, +/-keratinization none usu. paediatric population acinar cell carcinoma
Acinar cell carcinoma acinar arch. - (WC), (histopathology-india.net) trypsin, lipase nests or trabeculae, nucleolus, mod. basophilic granular cytoplasm head (slight predilection) - pancreatoblastoma
Undifferentiated carcinoma with osteoclast-like giant cells giant cells - Image? IHC? giant cells, usu. with AIS or inv. ductal adenocarcinoma head - anaplastic carcinoma
Chronic pancreatitis fibrosis, loss of acinar tissue, preservation of lobular arch. - [2] IHC? loss of acinar tissue with preservation of islets, fibrosis ? not a neoplasm, included here as it is in the (clinical) DDx ductal adenocarcinoma

WHO classification

Benign epithelial:

Borderline epithelial:

Malignant epithelial:

Soft tissue tumours:

Ectopic pancreatic tissue

It comes in two flavours:[5]

  • Pancreatic ectopia.
  • Pancreatic (acinar) metaplasia.

Pancreatic acinar metaplasia

  • Abbreviated PAM.
  • AKA pancreatic metaplasia.[6]

General

Gross

  • May be a single lesion or a cluster of lesions.[6]

Note:

Microscopic

Features:

  • Pancreatic acini - only.
    • Intensely eosinophilic cytoplasm.

Negatives:

  • No pancreatic ducts.
  • No islets of Langerhans (pancreatic islets).

Images

  • PAM - high mag. (WC/Nephron)

  • PAM - low mag. (WC/Nephron)

IHC

Features:[9]

  • Trypase +ve.
  • Lipase +ve.

Sign out

It can be debated whether it is worth reporting. 

ESOPHAGUS (DISTAL), BIOPSY:
- COLUMNAR EPITHELIUM WITH MODERATE CHRONIC, FOCALLY ACTIVE, INFLAMMATION, AND
  PANCREATIC ACINAR METAPLASIA.
- REACTIVE SQUAMOUS EPITHELIUM.
- NEGATIVE FOR INTESTINAL METAPLASIA.
- NEGATIVE FOR DYSPLASIA AND NEGATIVE FOR MALIGNANCY.

Pancreatic ectopia

General

  • May be confused with something pathologic.

Microscopic

Features:

  • Consists of pancreatic acini and pancreatic ducts.
  • +/-Islets of Langerhans.

Inflammatory

Pancreatitis

Classification

Etiology

Mnemonic I GET SMASHED:

Acute pancreatitis

Main article: Acute pancreatitis

Chronic pancreatitis

Main article: Chronic pancreatitis

Cystic lesions - overview

General

  • True cystic lesions are uncommon.
    • A true cystic lesion: must have an epithelial lining.
      • Only 10% of cystic lesions are true cystic lesions, i.e. 90% of cystic lesions are really pseudocysts.
  • It is hard to differentiate pseudocysts & cysts.

Cystic tumours - clinical

General:

  • Usually diagnosed by imaging (CT/MRI, ERCP, Endoscopic ultrasound).
    • 50% incidental finding.
  • Vague symptoms
  • Abdominal mass.
  • Weight loss.
  • Jaundice.
  • Usually favourable prognosis - mostly benign.

Most important cystic lesions

  • Serous.
  • Mucinous.
    • Ovarian-like stroma.
  • Solid pseudopapillay tumours.
  • Intraductal papillary mucinous tumour (IPMT).
    • No ovarian-like stroma.

Mnemonic SIMS: Serous, IPMT, Mucinous, Solid pseudopapillary tumour.

Useful stains

  • PAS-D.

Mucinous vs. IMPT

IMPT:

  • No ovarian-like stroma.
  • Usually has total pancreatectomy.

Cystic tumours of the pancreas

Khalifa's table of cystic tumours:

Tumour Usual sex Age (years) Usual site Typical
size (cm) 		Gross pathology
Serous microcystic
adenoma 		female 66 body & tail 11 (joplink.net[10], (jhmi.edu)[11]
Intraductal papillary
mucinous tumour (IPMT) 		male 62 head 4 (jhmi.edu)[11]
Mucinous tumour female 49 body & tail 10 (rsna.org)
Solid pseudopapillary
tumour 		female 35 any 7.5 (ajronline.org), (flickr.com/humpath)

Cystic lesions

Serous tumours - overview

General

  • Cell of origin: intralobular duct cells (ductular cells).
  • Glycogen rich - but do not produce mucin.

Subclassication

Note:

  • If one mucin +ve cell, tumour = a mucinous tumour.

Serous cystadenoma of the pancreas

  • AKA serous microcystic adenoma,[12] AKA pancreatic serous cystadenoma.
Main article: Serous cystadenoma of the pancreas

Mucinous cystic neoplasms of the pancreas

  • Gastro-entero-pancreatic cell differentiation with hypercellular ovarian-type stroma.
    • Stroma --> cellular.
  • 2-2.5% of all exocrine pancreatic tumours.
  • Almost exclusively in women.
  • Mean age - 49 years.
  • >80% in body and tail.
  • Average size ~10 cm.

Note:

  • Looks different than serous tumour.

Subclassification

  • Mucinous cystadenoma.
  • Borderline mucinous cystic tumour.
  • Mucinous cystadenocarcinoma.

Borderline vs. Carcinoma

  • Few mitoses in borderline.

Radiology

  • Mucinous tumours: multilocular.
  • Generally larger than serous.
  • Often partially solid and cystic.
  • Often calcified.
    • Calcification rare in serous.
  • Usually tail & body.

Microscopic

Mucinous cystadenoma

Features:[14]

  • Simple tall columnar epithelium with large mucin vacuole on apical aspect.
  • "Ovarian-type stroma" under epithelium.
    • Ovarin-type stroma: high density of small (non-wavy) spindle cells with eosinophilic cytoplasm.

Notes:

  • Appearance similar to mucinous cystadenoma in the ovary.
  • Mucin stains +ve (intracytoplasmic).
Images

  • Benign mucinous cystic neoplasm - very low mag. (WC)

  • Benign mucinous cystic neoplasm - low mag.(WC)

  • Benign mucinous cystic neoplasm - intermed. mag. (WC)

  • Benign mucinous cystic neoplasm - showing stroma - high mag. (WC)

www:

Mucinous cystic neoplasm of pancreas Mucinous cystic neoplasm of pancreas Mucinous cystic neoplasm of pancreas Mucinous cystic neoplasm of pancreas Mucinous cystic neoplasm of pancreas Mucinous cystic neoplasm of pancreas Mucinous cystic neoplasm of pancreas

Benign mucinous cystic neoplasm of pancreas in a 62 year old woman. A. CT scan showed a peripherally calcified spheroidal mass at the tail of the pancreas. Cytology only showed debris and inflammatory cells, but CEA of the fluid was 2875.2 ng/mL. B. Almost all sections of the cyst showed acellular debris topping a fibrous, often calcified wall, consistent with a pseudocyst. C. Extensive sampling, undertaken because of the high CEA, revealed rare sections with a lining. D. Lining nuclei are bland, with even chromatin. Shape and size variation, as well as darkening when shrunken, are all explicable by degeneration. E. Within distal pancreas, a focus of changes of chronic pancreatitis is seen upper left, while a pancreatic duct in lower right shows an intraductal proliferation. F. Tumor cells show mucinous vacuoles, with better preserved nuclei.  Nuclear appearances remain bland. G. Cellular ovarian stroma appeared beneath epithelium of a separate focus of the cystic neoplasm.

Borderline mucinous cystic tumour

Features:

  • May have finger like projections.
  • Pseudostratification of epithelium.

Notes:

  • Surgery does not change based on diagnosis on frozen section.
    • Only question is "Is the margin clear?".
  • Borderline tumours are rare.

Carcinoma

  • Cells floating in mucin.

Mucinous tumour versus pseudocyst

Finding Mucinous tumour Pseudocyst
Amylase & lipase low high
Viscosity high low
CEA, CA125 high low

Prognosis:

  • Benign looking tumours have the potential to transform into carcinoma.
  • No report of assoc. pseudomyxoma peritonei.
    • US boards question -- it is an exception ... others one cause it.
  • Prognosis of m. cystadenocarcinoma is slightly better than that of ductal adenocarcinoma.

Intraductal papillary mucinous tumour

  • Abbreviated IPMT.
  • AKA intraductal papillary mucinous neoplasm, abbreviated IPMN.
Main article: Intraductal papillary mucinous tumour

Solid pseudopapillary tumour

  • AKA solid pseudopapillary neoplasm, abbreviation SPN.
  • AKA solid and papillary epithelial neoplasm, abbreviated SPEN.[15]
Main article: Solid pseudopapillary tumour

Pre-malignant lesions

Pancreatic intraepithelial neoplasia

  • Abbreviated PanIN.
Main article: Pancreatic intraepithelial neoplasia

Solid tumours

Invasive ductal carcinoma of the pancreas

  • AKA ductal adenocarcinoma.
  • AKA pancreatic ductal adenocarcinoma.
  • AKA pancreatic adenocarcinoma.
Main article: Invasive ductal carcinoma of the pancreas

Pancreatic neuroendocrine tumour

  • Abbreviated PanNET.[16]
  • AKA pancreatic islet cell tumour[16] - considered to be an outdated term.
  • AKA islet cell tumour - considered to be an outdated term.
Main article: Neuroendocrine tumour of the pancreas

Acinar cell carcinoma of the pancreas

Not to be confused with acinic cell carcinoma.
  • AKA acinar cell carcinoma.
  • AKA pancreatic acinar cell carcinoma.[17]
Main article: Acinar cell carcinoma of the pancreas

Pancreatoblastoma

Main article: Pancreatoblastoma

See also

References

  1. ↑ URL: http://www.cap.org/apps/docs/committees/cancer/cancer_protocols/2011/PancreasEndo_11protocol.pdf. Accessed on: 29 March 2012.
  2. ↑ URL: http://www.cap.org/apps/docs/committees/cancer/cancer_protocols/2011/SmallbowelNET_11protocol.pdf. Accessed on: 29 March 2012.
  3. ↑ Jamieson, NB.; Foulis, AK.; Oien, KA.; Going, JJ.; Glen, P.; Dickson, EJ.; Imrie, CW.; McKay, CJ. et al. (Jun 2010). "Positive mobilization margins alone do not influence survival following pancreatico-duodenectomy for pancreatic ductal adenocarcinoma.". Ann Surg 251 (6): 1003-10. doi:10.1097/SLA.0b013e3181d77369. PMID 20485150.
  4. ↑ URL: http://www.cap.org/apps/docs/committees/cancer/cancer_protocols/2011/PancreasEndo_11protocol.pdf. Accessed on: 6 April 2012.
  5. ↑ URL: http://test.pathologyportal.org/newindex.htm?92nd/specgasth2.htm. Accessed on: 14 March 2011.
  6. ↑ 6.0 6.1 Stachura, J.; Konturek, JW.; Urbanczyk, K.; Bogdal, J.; Mach, T.; Domschke, W. (Mar 1996). "Endoscopic and histological appearance of pancreatic metaplasia in the human gastric mucosa: a preliminary report on a recently recognized new type of gastric mucosal metaplasia.". Eur J Gastroenterol Hepatol 8 (3): 239-43. PMID 8724024.
  7. ↑ 7.0 7.1 7.2 7.3 Schneider, NI.; Plieschnegger, W.; Geppert, M.; Wigginghaus, B.; Höss, GM.; Eherer, A.; Wolf, EM.; Rehak, P. et al. (Aug 2013). "Pancreatic acinar cells-a normal finding at the gastroesophageal junction? Data from a prospective Central European multicenter study.". Virchows Arch. doi:10.1007/s00428-013-1471-8. PMID 23989798.
  8. ↑ Johansson J, Håkansson HO, Mellblom L, et al. (March 2010). "Pancreatic acinar metaplasia in the distal oesophagus and the gastric cardia: prevalence, predictors and relation to GORD". J. Gastroenterol. 45 (3): 291–9. doi:10.1007/s00535-009-0161-4. PMID 20012917.
  9. ↑ Doglioni, C.; Laurino, L.; Dei Tos, AP.; De Boni, M.; Franzin, G.; Braidotti, P.; Viale, G. (Nov 1993). "Pancreatic (acinar) metaplasia of the gastric mucosa. Histology, ultrastructure, immunocytochemistry, and clinicopathologic correlations of 101 cases.". Am J Surg Pathol 17 (11): 1134-43. PMID 8214258.
  10. ↑ URL: http://www.joplink.net/prev/200905/25.html. Accessed on: 15 February 2012.
  11. ↑ 11.0 11.1 URL: http://oac.med.jhmi.edu/cpc/cases/cpc5/cpc5_answer.html. Accessed on: 15 February 2012.
  12. ↑ 12.0 12.1 Mills, Stacey E; Carter, Darryl; Greenson, Joel K; Oberman, Harold A; Reuter, Victor E (2004). Sternberg's Diagnostic Surgical Pathology (4th ed.). Lippincott Williams & Wilkins. pp. 1630. ISBN 978-0781740517.
  13. ↑ Bano, S.; Upreti, L.; Puri, SK.; Chaudhary, V.; Sakuja, P. (Dec 2011). "Imaging of pancreatic serous cystadenocarcinoma.". Jpn J Radiol 29 (10): 730-4. doi:10.1007/s11604-011-0617-3. PMID 22009426.
  14. ↑ Iacobuzio-Donahue, Christine A.; Montgomery, Elizabeth A. (2005). Gastrointestinal and Liver Pathology: A Volume in the Foundations in Diagnostic Pathology Series (1st ed.). Churchill Livingstone. pp. 489. ISBN 978-0443066573.
  15. ↑ URL: http://brighamrad.harvard.edu/Cases/bwh/hcache/360/full.html. Accessed on: 31 October 2011.
  16. ↑ 16.0 16.1 Burns, WR.; Edil, BH. (Dec 2011). "Neuroendocrine Pancreatic Tumors: Guidelines for Management and Update.". Curr Treat Options Oncol. doi:10.1007/s11864-011-0172-2. PMID 22198808.
  17. ↑ Thomas, PC.; Nash, GF.; Aldridge, MC. (2003). "Pancreatic acinar cell carcinoma presenting as acute pancreatitis.". HPB (Oxford) 5 (2): 111-3. doi:10.1080/13651820310001153. PMID 18332967.

Further reading

Klimstra, DS.; Pitman, MB.; Hruban, RH. (Mar 2009). "An algorithmic approach to the diagnosis of pancreatic neoplasms.". Arch Pathol Lab Med 133 (3): 454-64. doi:10.1043/1543-2165-133.3.454. PMID 19260750.

External links

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