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'''Soft tissue lesions''' strike fear in many pathologists as they are uncommon and may be difficult to diagnose.  
'''Soft tissue lesions''' strike fear in many pathologists as they are uncommon and may be difficult to diagnose. Malignant soft tissue lesions, i.e. [[cancer|cancerous]] soft tissue lesions, are usually '''sarcomas'''. Sarcomas are malignancies derived from mesenchymal tissue. 
 
''Bone tumours'' are dealt with in the ''[[bone]]'' article.


=Introduction=
==WHO classification of soft tissue lesions/tumours==
==WHO classification of soft tissue lesions/tumours==
===Morphologic grouping<ref name=Ref_WMSP601-3>{{Ref WMSP|601-3}}</ref>===
===Morphologic grouping===
#Adipocytic tumours.
These include:<ref name=Ref_WMSP601-3>{{Ref WMSP|601-3}}</ref>
#Fibroblastic/myofibroblastic tumours.
#[[Adipocytic tumours]].
#"Fibrohistiocytic" tumours.
#[[Fibroblastic/myofibroblastic tumours]].
#Smooth muscle tumours.
#[[Fibrohistiocytic tumours|"Fibrohistiocytic" tumours]].
#Skeletal muscle tumours.
#[[Smooth muscle tumours|Smooth muscle tumours]].
#Vascular tumours.
#[[Soft tissue lesions#Skeletal muscle tumours|Skeletal muscle tumours]].
#Perivascular (pericytic) tumours.
#[[Vascular tumours]].
#Chondro-osseous tumours.
#[[Soft_tissue_lesions#Perivascular_tumours|Perivascular (pericytic) tumours]].
#Tumours of uncertain differentiation.
#[[Chondro-osseous tumours]].
#[[Soft tissue lesions#Tumours of uncertain differentiation|Tumours of uncertain differentiation]].


===Biologic potential grouping<ref>{{Ref WMSP|598-604}}</ref>===
===Biologic potential grouping===
These include:<ref>{{Ref WMSP|598-604}}</ref>
#Benign.
#Benign.
#Intermediate (locally aggressive).
#Intermediate (locally aggressive).
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*Once upon a time almost everything was called ''malignant fibrous histiocytoma''; thus, it is listed as a common entity in some publications.
*Once upon a time almost everything was called ''malignant fibrous histiocytoma''; thus, it is listed as a common entity in some publications.


===Most common:<ref name=pmid17976362>{{cite journal |author=Skubitz KM, D'Adamo DR |title=Sarcoma |journal=Mayo Clin. Proc. |volume=82 |issue=11 |pages=1409–32 |year=2007 |month=November |pmid=17976362 |doi= |url= http://www.mayoclinicproceedings.com/content/82/11/1409.long}}</ref>===
Most common:<ref name=pmid17976362>{{cite journal |author=Skubitz KM, D'Adamo DR |title=Sarcoma |journal=Mayo Clin. Proc. |volume=82 |issue=11 |pages=1409–32 |year=2007 |month=November |pmid=17976362 |doi= |url= http://www.mayoclinicproceedings.com/content/82/11/1409.long}}</ref>
*Liposarcoma.
*Liposarcoma.
*Leiomyosarcoma.
*Leiomyosarcoma.


==Molecular testing==
==Molecular testing==
{{Main|Molecular pathology}}
*Molecular testing plays an important role in soft tissue pathology.
*Molecular testing plays an important role in soft tissue pathology.
*It is generally seen as an adjunct test that:<ref name=pmid11454050>{{cite journal |author=Fletcher CD, Fletcher JA, Dal Cin P, Ladanyi M, Woodruff JM |title=Diagnostic gold standard for soft tissue tumours: morphology or molecular genetics? |journal=Histopathology |volume=39 |issue=1 |pages=100–3 |year=2001 |month=July |pmid=11454050 |doi= |url=}}</ref>
*It is generally seen as an adjunct test that:<ref name=pmid11454050>{{cite journal |author=Fletcher CD, Fletcher JA, Dal Cin P, Ladanyi M, Woodruff JM |title=Diagnostic gold standard for soft tissue tumours: morphology or molecular genetics? |journal=Histopathology |volume=39 |issue=1 |pages=100–3 |year=2001 |month=July |pmid=11454050 |doi= |url=}}</ref>
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**May directly affect treatment.
**May directly affect treatment.


=Adipocytic tumours=
===Translocations===
==Hibernoma==
{{Main|Chromosomal translocations}}
===General===
*Many tumours in soft tissue pathology are diagnosed inconjunction with the finding of [[chromosomal translocations]].
*Consists of ''brown fat'' (present in the infants to generate heat).<ref name=Ref_WMSP605>{{Ref WMSP|605}}</ref>
*Benign.
*Usually asymptomatic.<ref name=pmid19131775>{{cite journal |author=Ahmed SA, Schuller I |title=Pediatric hibernoma: a case review |journal=J. Pediatr. Hematol. Oncol. |volume=30 |issue=12 |pages=900–1 |year=2008 |month=December |pmid=19131775 |doi=10.1097/MPH.0b013e318184e6dd |url=}}</ref>


===Epidemiology===
==Morphohistologic patterns==
*Young adults.
{{Main|Morphologic patterns}}
{| class="wikitable sortable" style="margin-left:auto;margin-right:auto"
! Name
! Description
! DDx
! Image(s)
|-
| Storiform, [[AKA]] patternless pattern<ref name=pmid9704618>{{cite journal |author=Mangano WE, Cagle PT, Churg A, Vollmer RT, Roggli VL |title=The diagnosis of desmoplastic malignant mesothelioma and its distinction from fibrous pleurisy: a histologic and immunohistochemical analysis of 31 cases including p53 immunostaining |journal=Am. J. Clin. Pathol. |volume=110 |issue=2 |pages=191–9 |year=1998 |month=August |pmid=9704618 |doi= |url=}}</ref>
| whorled, cartwheel-like arrangement
| [[pleomorphic undifferentiated sarcoma]], [[solitary fibrous tumour]], [[dermatofibrosarcoma protuberans]], [[dermatofibroma]]<ref name=pmid224569>{{cite journal |author=Meister P, Höhne N, Konrad E, Eder M |title=Fibrous histiocytoma: an analysis of the storiform pattern |journal=Virchows Arch A Pathol Anat Histol |volume=383 |issue=1 |pages=31–41 |year=1979 |month=July |pmid=224569 |doi= |url=}}</ref>
| [[Image:Storiform_pattern_-_intermed_mag.jpg |thumb|center|150px| Patternless pattern. (WC)]]
|-
| Herring bone
| like herring bone (technique) for climbing a hill in cross country skiing; books on a shelf, where they have partially fallen over -- on the one shelf to the left and the one below to the right
| [[fibrosarcoma]], [[synovial sarcoma]], [[MPNST]]
| [[Image:Malignant_peripheral_nerve_sheath_tumour_-_intermed_mag.jpg |thumb|center|150px |Herring bone. (WC)]]
|-
| Fascicular
| the long axis of the (spindle) cells are perpendicular to one another in adjacent bundles of cells
| [[leiomyoma]], [[leiomyosarcoma]]
| [[Image:Cutaneous_leiomyosarcoma_-_high_mag.jpg |thumb|center|150px| Fascicular pattern. (WC)]]
|-
| Biphasic
| nests of cells and stroma
| [[synovial sarcoma]], [[DSRCT]], [[alveolar RMS]]
| [[Image:Desmoplastic_small_round_cell_tumour_-_high_mag.jpg|thumb|center|150px| DSRCT. (WC)]]
|- <!--
| name ?
| description ?
| DDx ?
| image ? -->
|}


===Gross===
Notes:
*Well-circumscribed.
*Memory device: herring bone DDx ''MSF'' = MPNST, Synovial sarcoma, Fibrosarcoma.
*Lobulated and light-brown on sectioning.


===Microscopic===
==Grading==
Features:<ref>{{cite journal |author=Chen DY, Wang CM, Chan HL |title=Hibernoma. Case report and literature review |journal=Dermatol Surg |volume=24 |issue=3 |pages=393–5 |year=1998 |month=March |pmid=9537018 |doi= |url=}}</ref>
*Several systems exist.
*Large polygonal/oval cells:
*The US-CAP advocates the use of the French system over the NCI system.
**Nucleus - central & small.<ref>[http://www.pathconsultddx.com/pathCon/diagnosis?pii=S1559-8675(06)70271-6 http://www.pathconsultddx.com/pathCon/diagnosis?pii=S1559-8675(06)70271-6]</ref>
**The French system is a better predictor metastases and mortality.<ref name=pmid8996162>{{cite journal |author=Guillou L, Coindre JM, Bonichon F, ''et al.'' |title=Comparative study of the National Cancer Institute and French Federation of Cancer Centers Sarcoma Group grading systems in a population of 410 adult patients with soft tissue sarcoma |journal=J. Clin. Oncol. |volume=15 |issue=1 |pages=350–62 |year=1997 |month=January |pmid=8996162 |doi= |url=}}</ref>
***Nucleoli typically prominent.<ref>[http://surgpathcriteria.stanford.edu/softfat/hibernoma/ http://surgpathcriteria.stanford.edu/softfat/hibernoma/]</ref>
**Cytoplasm - multivacuolated, oval, eosinophilic, granular.


Image:
===French system===
*[http://en.wikipedia.org/wiki/File:Hibernoma1.jpg Hibernoma (WC)].
*Formally known as the grading system from the ''French Federation of Cancer Centres Sarcoma Group'' (FNCLCC).


==Liposarcoma==
====Overview====
*Most common malignant sarcoma in the retroperitoneum.
Components - overview:<ref name=pmid8996162/><ref name=uscap_stp>URL: [http://www.cap.org/apps/docs/committees/cancer/cancer_protocols/2011/SoftTissue_11protocol.pdf http://www.cap.org/apps/docs/committees/cancer/cancer_protocols/2011/SoftTissue_11protocol.pdf]. Accessed on: 12 April 2011.</ref>
#Differentiation (score 1-3).
#*De facto, this is mostly the ''histologic type''.
#Mitotic rate (score 1-3).
#Necrosis (score 0-2)


===Microscopy===
Obtaining a score:
Features:
*Add all the points from the three components.
*Lipoblasts:
**Large sharply demarcated vacuole.
**Nucleus:
***Hyperchromatic (dark staining) nucleus.
***Eccentric location.
***Nuclear indentation.


Images:
Scoring:
*[http://commons.wikimedia.org/wiki/File:Myxoid_liposarcoma_%2806%29.JPG Myxoid liposarcoma (WC)].
*Grade 1 = 2-3.
*[http://commons.wikimedia.org/wiki/File:Myxoid_liposarcoma_%2805%29.JPG Myxoid liposarcoma (WC)].
*Grade 2 = 4-5.
*[http://www.john-libbey-eurotext.fr/e-docs/00/04/09/14/texte_alt_jleejd00046_gr5.jpg Lipoblasts (john-libbey-eurotext.fr)].
*Grade 3 = 6-8.


===IHC===
=====Differentiation=====
*IHC is of limited value.
*Standardized for histologic types.
*Most tumours = 3/3.


*S-100 +ve ~1/3 of the time.
Exceptions:<ref name=uscap_stp/>
*Reticulin ???.
*Well-differentiated liposarcoma = 1.
*Myxoid liposarcoma = 2.
*Conventional [[liposarcoma]] = 2.
*Fibrosarcoma = 2.
*[[Myxofibrosarcoma]] =2.


=Smooth muscle tumours=
A group of tumours is not graded:<ref name=uscap_stp/>
==Leiomyosarcoma==
*[[MPNST]].
See gyne notes.
*[[Rhabdomyosarcoma]].
*[[Alveolar soft part sarcoma]].
*[[Clear cell sarcoma]].
*[[Extraskeletal myxoid chondrosarcoma]].


===Microscopy===
=====Mitotic rate=====
Features:
*0-9 mitoses/10 HPF.
*Nuclear atypia.
*10-19 mitoses/10 HPF.
*Necrosis.
*>=20 mitoses/10 HPF.
*Mitoses.


=Fibroblastic/myofibroblastic tumours=
Notes:
*1 HPF = 0.1734 mm^2.
**Most resident microscopes have a field of view = 0.2376 mm^2.
***Thus, ~7.3 HPFs on a resident microscope corresponds to 10 US-CAP HPFs.


==Proliferative fasciitis==
=====Necrosis=====
*Need to write something here.
*None = score 0.
*<=50% of tumour = score 1.
*>50% of tumour = score 2.


==Solitary fibrous tumour==
===System used by some at MSH===
===General===
Some pathologists at [[MSH]] use the system advocated by Costa et al..<ref name=pmid6692258>{{cite journal |author=Costa J, Wesley RA, Glatstein E, Rosenberg SA |title=The grading of soft tissue sarcomas. Results of a clinicohistopathologic correlation in a series of 163 cases |journal=Cancer |volume=53 |issue=3 |pages=530–41 |year=1984 |month=February |pmid=6692258 |doi= |url=}}</ref>
*Grouped with ''hemangiopericytoma'' in the WHO classification; possibly the same tumour (?).<ref name=Ref_WMSP609>{{Ref WMSP|609}}</ref>
*May be benign ''or'' malignant; more commonly benign.<ref>URL: [http://www.pathconsultddx.com/pathCon/diagnosis?pii=S1559-8675%2806%2970528-9 http://www.pathconsultddx.com/pathCon/diagnosis?pii=S1559-8675%2806%2970528-9]. Accessed on: 25 June 2010.</ref><ref>URL: [http://wjso.com/content/6/1/86 http://wjso.com/content/6/1/86]. Accessed on: 25 June 2010.</ref>


===Microscopic===
====Scoring====
Features:
*Grade 1 = 1 point.
*Well-circumscribed.
*Grade 2 = 2 points.
*Fibroblast-like cells (spindle cells).
*Grade 3 = 3-4 points.
*Hemangiopericytoma-like area (staghorn vessels) - not seen on image.
*Keloid-like collagen bundles.


Images:
====Components====
*[http://commons.wikimedia.org/wiki/File:Solitary_fibrous_tumour_low_mag.jpg SFT - low mag. (WC)].
Points for each of the following:
*[http://commons.wikimedia.org/wiki/File:Solitary_fibrous_tumour_intermed_mag.jpg SFT - intermed. mag. (WC)].
*Mitotic activity >= 6 / 10 HPF @ 40X - definition suffers from [[HPFitis]].
*[http://commons.wikimedia.org/wiki/File:Solitary_fibrous_tumour_high_mag.jpg SFT - high mag. (WC)].
*Pleomorphism present.
*Cellularity (cells/matrix) > 50%.
*Necrosis >15% - microscopic (without targeting necrosis grossly) ''or'' grossly.


==Hemangiopericytoma==
==Stage==
===General===
{{Main|Cancer staging systems}}
*Grouped with ''solitary fibrous tumour'' in the WHO classification; possibly the same tumour (?).<ref name=Ref_WMSP609>{{Ref WMSP|609}}</ref>
===Lymph node metastases in sarcomas===
*Arises from the ''pericyte'', a connective tissue cell of small vessels that is thought to be involved in flow regulation.
{{Main|Lymph node metastasis}}
*Hematologic spread most common - to lungs.<ref>URL: [http://emedicine.medscape.com/article/1255879-overview http://emedicine.medscape.com/article/1255879-overview]. Accessed on: 2 May 2010.</ref>
*[[Lymph node]] (LN) spread is uncommon in sarcomas; [[lymph node metastases]] are seen in <3% of cases.<ref name=pmid8424704>{{Cite journal  | last1 = Fong | first1 = Y. | last2 = Coit | first2 = DG. | last3 = Woodruff | first3 = JM. | last4 = Brennan | first4 = MF. | title = Lymph node metastasis from soft tissue sarcoma in adults. Analysis of data from a prospective database of 1772 sarcoma patients. | journal = Ann Surg | volume = 217 | issue = 1 | pages = 72-7 | month = Jan | year = 1993 | doi =  | PMID = 8424704 | PMC = 1242736}}</ref>
*Oncogenic osteomalacia - assoc. with hemangiopericytoma.<ref>URL: [http://emedicine.medscape.com/article/1255879-overview http://emedicine.medscape.com/article/1255879-overview]. Accessed on: 2 May 2010.</ref>
**Many sarcomas are reported in LNs.
***According to the [[CAP checklist]] for soft tissue<ref>URL: [http://www.cap.org/apps/docs/committees/cancer/cancer_protocols/2011/SoftTissue_11protocol.pdf http://www.cap.org/apps/docs/committees/cancer/cancer_protocols/2011/SoftTissue_11protocol.pdf]. Accessed on: 28 March 2012.</ref> the most common are: [[epithelioid sarcoma]] and [[clear cell sarcoma]].
***According to Fong ''et al.''<ref name=pmid8424704/> the most commonly is: angiosarcoma.


===Presentation===
Sarcomas more likely to be found in the lymph nodes - mnemonic ''RACE For MS'':<ref>URL: [http://www.aippg.net/forum/f21/surgery-mnemonics-79897/ http://www.aippg.net/forum/f21/surgery-mnemonics-79897/]. Accessed on: 23 March 2012.</ref>
*Usually painless mass, slow enlargement.
*[[rhabdomyosarcoma|'''R'''habdomyosarcoma]]
*[[Angiosarcoma|'''A'''ngiosarcoma]].
*[[clear cell sarcoma|'''C'''lear cell sarcoma]].
*[[epithelioid sarcoma|'''E'''pitheliod sarcoma]].
*[[fibrosarcoma|'''F'''ibrosarcoma]].
*[[pleomorphic undifferentiated sarcoma|'''M'''alignant fibrous histiocytoma (pleomorphic undifferentiated sarcoma)]].
*[[synovial sarcoma|'''S'''ynovial cell sarcoma]].


====Radiology====
==DDx by history/site==
*Intramedullary lytic mass.
===Retroperiteum===
*May be well-circumscribed.
#[[Liposarcoma]].
*+/-Periosteal reaction.
#[[Undifferentiated pleomorphic sarcoma]].
*+/-Sclerotic border.
#[[Leiomyosarcoma]].
#[[MPNST]].


May be worked-up with angiography to distinguish from a vascular malformation.<ref>URL: [http://emedicine.medscape.com/article/1255879-diagnosis http://emedicine.medscape.com/article/1255879-diagnosis]. Accessed on: 2 May 2010.</ref>
Note:
===Location===
[[Synovial sarcoma]] and [[fibrosarcoma]] are very rare in the retroperitoneum.
*Usually extremities - femur or prox. tibial.<ref>URL: [http://emedicine.medscape.com/article/1255879-overview http://emedicine.medscape.com/article/1255879-overview]. Accessed on: 2 May 2010.</ref>


===Histology===
===Young person - extremity sarcoma===
Features:<ref>URL: [http://emedicine.medscape.com/article/1255879-diagnosis http://emedicine.medscape.com/article/1255879-diagnosis]. Accessed on: 2 May 2010.</ref>
#[[Epithelioid sarcoma]].
*Hypervascular lesion - '''key diagnostic feature'''.<ref name=enzinger>Enzinger & Weiss's Soft Tissue Tumors. 4th Ed. PP.1007-13. ISBN 0-323-01200-0.</ref>
#[[Synovial sarcoma]].
**Abundant thin-walled branching small vessels of variable size.
***May be described as "staghorn vessels" or "antler-like" vasculature.
***Cells may "onion-skin" around thin blood vessels.
*Spindle or ovoid shaped cells in nests or sheets.


===IHC===
==Gross characteristics==
Features:<ref name=Ref_WMSP609>{{Ref WMSP|609}}</ref><ref name=enzinger/>
*Usually non-specific.
*Vimentin +ve (usually).
*Most sarcomas have a pushing border.
*Desmin -ve (typical).
**If there is an infiltrative border think: (1) fibromatosis, (2) carcinoma.
*Factor VIII -ve (marks endothelium).
*CD34 +ve.
**CD34 usu. -ve in synovial sarcoma.
*CD31 -ve (marks benign endothelium).
*vWF (von Willebrand factor) -ve.


===DDx===
=Adipocytic tumours=
*Other vascular tumours.
{{Main|Adipocytic tumours}}
*Vascular malformations.
*Synovial sarcoma.


==Desmoplastic fibroblastoma==
This category includes:
*AKA ''collagenous fibroma''.<ref name=pmid18271804>{{Cite journal  | last1 = Watanabe | first1 = H. | last2 = Ishida | first2 = Y. | last3 = Nagashima | first3 = K. | last4 = Makino | first4 = T. | last5 = Norisugi | first5 = O. | last6 = Shimizu | first6 = T. | title = Desmoplastic fibroblastoma (collagenous fibroma). | journal = J Dermatol | volume = 35 | issue = 2 | pages = 93-7 | month = Feb | year = 2008 | doi = 10.1111/j.1346-8138.2008.00421.x | PMID = 18271804 }}</ref>
*Lipoma.
*Benign lesion.
*Liposarcoma.
*Classically found in shoulder region.
*Hibernoma.


===IHC===
=Smooth muscle tumours=
*Beta-catenin -ve.<ref name=pmid18544056>{{Cite journal  | last1 = Takahara | first1 = M. | last2 = Ichikawa | first2 = R. | last3 = Oda | first3 = Y. | last4 = Uchi | first4 = H. | last5 = Takeuchi | first5 = S. | last6 = Moroi | first6 = Y. | last7 = Kiryu | first7 = H. | last8 = Furue | first8 = M. | title = Desmoplastic fibroblastoma: a case presenting as a protruding nodule in the dermis. | journal = J Cutan Pathol | volume = 35 Suppl 1 | issue =  | pages = 70-3 | month = Oct | year = 2008 | doi = 10.1111/j.1600-0560.2007.00964.x | PMID = 18544056 }}
{{Main|Smooth muscle tumours}}
</ref>
IHC markers: desmin, SMA, H-caldemsin (most specific).
**Significance ???


=Vascular lesions=
==Leiomyosarcoma==
Vascular lesions are "too red"; they have too many RBCs.
{{Main|Leiomyosarcoma}}
 
==Hemangioma==
===General===
Comes is various flavours:<ref name=pmid10410855>{{cite journal |author=Prieto VG, Shea CR |title=Selected cutaneous vascular neoplasms. A review |journal=Dermatol Clin |volume=17 |issue=3 |pages=507–20, viii |year=1999 |month=July |pmid=10410855 |doi= |url=}}</ref>
*Tufted.
**Small clusters of blood vessels.
*Microvenular hemangioma.
*Glomeruloid hemangioma.
*Epithelioid hemangioma.
*Targetoid hemosideric hemangioma.


===Microscopic===
===Microscopic===
Features:
Features (summary):
*Abundance of benign small blood vessels. (???)
*Fasicular cellular spindle cell lesion with:
**Nuclear atypia.
**[[Necrosis]].
**High mitotic rate.


==Kaposi sarcoma==
=Fibrohistiocytic tumours=
===General===
''Fibrohistiocytic'' refers (only) to the histomorphologic appearance and therefore may be written in quotation marks; these tumours are not derived from histiocytes (or tissue macrophages), as the name implies.<ref name=pmid20055912>{{Cite journal  | last1 = Luzar | first1 = B. | last2 = Calonje | first2 = E. | title = Cutaneous fibrohistiocytic tumours - an update. | journal = Histopathology | volume = 56 | issue = 1 | pages = 148-65 | month = Jan | year = 2010 | doi = 10.1111/j.1365-2559.2009.03447.x | PMID = 20055912 }}</ref>
*Not really a sarcoma.
*Caused by HHV-8.
*Associated with immunodeficiency, e.g. HIV/AIDS.


===Stages===
==Pleomorphic undifferentiated sarcoma==
It is seen in different stages:<ref>URL: [http://www.histopathology-india.net/KS.htm http://www.histopathology-india.net/KS.htm]. Accessed on: 31 January 2010.</ref>
*Abbreviated ''PUS''.
#Patch stage.
*[[AKA]] ''Undifferentiated pleomorphic sarcoma'', abbreviated ''UPS''.
#Plaque stage.
*Previously known as ''malignant fibrous histiocytoma'', abbreviated ''MFH''.<ref>URL: [http://sarcomahelp.org/learning_center/mfh.html http://sarcomahelp.org/learning_center/mfh.html]. Accessed on: 8 April 2011.</ref>
#Nodular stage.
{{Main|Pleomorphic undifferentiated sarcoma}}
#Lymphangioma-like. (???)


===Microscopic===
=Fibroblastic/myofibroblastic tumours=
Features:<ref>Klatt. AOP P.23.</ref>
{{Main|Fibroblastic/myofibroblastic tumours}}
*Vascular channels that anastomose - '''key feature'''.
*+/-Nuclear atypia.
*Hyaline globules (intracytoplasmic)<ref name=pmid7528163>{{cite journal |author=del Rosario AD, Bui HX, Singh J, Ginsburg R, Ross JS |title=Intracytoplasmic eosinophilic hyaline globules in cartilaginous neoplasms: a surgical, pathological, ultrastructural, and electron probe x-ray microanalytic study |journal=Hum. Pathol. |volume=25 |issue=12 |pages=1283–9 |year=1994 |month=December |pmid=7528163 |doi= |url=}}</ref> - pale pink globs (that are paler than RBCs) - '''important feature'''.
*+/-Hemosiderin deposits.
 
DDx:
*Angiosarcoma (have many mitoses, nuclear atypia).
*Masson's hemangioma (Intravascular papillary endothelial hyperplasia).


Notes:
This is a very large and important group of soft tissue lesions. It is covered in a separate article.
*Hyaline globules have a DDx (hepatocellular carcinoma, lung adenocarcinoma, chondrosarcomas + others).<ref name=pmid7528163/>
*Promontory sign - small vessel protruding into an abnormal vascular space.<ref name=pmid19318797>PMID 19318797.</ref>
**Not pathognomonic for KS.<ref name=pmid20577080>PMID 20577080.</ref>
**Image: [http://www.diagnosticpathology.org/content/3/1/31/figure/F1 Promontory sign (diagnosticpathology.org)].


Images:
The grouping includes:
*[http://commons.wikimedia.org/wiki/File:Kaposi_sarcoma_high_mag.jpg Kaposi sacoma - high mag. (WC)].
*[[Inflammatory myofibroblastic tumour]].
*[http://commons.wikimedia.org/wiki/File:Kaposi_sarcoma_low_intermed_mag.jpg Kaposi sarcoma - intermed. mag. (WC)].
*[[Nodular fasciitis]].
*[[Desmoid-type fibromatosis]] (Desmoid tumour).
*[[Proliferative fasciitis]].
*[[Solitary fibrous tumour]] ([[Hemangiopericytoma]]).
*[[Desmoplastic fibroblastoma]].
*[[Low-grade fibromyxoid sarcoma]].
*Others.


===IHC===
=Perivascular tumours=
*CD31 +ve.  
This grouping includes only two:<ref name=Ref_WMSP602>{{Ref WMSP|602}}</ref>
*CD34 +ve.
*[[Glomus tumour]] - both benign and malignant.
*HHV-8 +ve.
*[[Myopericytoma]].


==Masson hemangioma==
=Vascular lesions=
===General===
{{Main|Vascular lesions}}
*Benign non-neoplastic lesion - a vessel that has thrombosed and recanalized.
Vascular lesions are "too red"; they have too many RBCs.
*[[AKA]] ''intravascular papillary endothelial hyperplasia''.<ref name=pmid15865098>{{cite journal |author=Korkolis DP, Papaevangelou M, Koulaxouzidis G, Zirganos N, Psichogiou H, Vassilopoulos PP |title=Intravascular papillary endothelial hyperplasia (Masson's hemangioma) presenting as a soft-tissue sarcoma |journal=Anticancer Res. |volume=25 |issue=2B |pages=1409–12 |year=2005 |pmid=15865098 |doi= |url=}}</ref>
*Histomorphologically may be confused with low-grade angiosarcoma or other soft tissue sarcomas.<ref name=pmid15865098/>
===Microscopic===
Features:
*Well-circumscribed - '''key (low power) feature'''.
*Abundant small vascular channels with benign endothelium.


Notes:
They include:
*Looks like Kaposi sarcoma at high power.
*[[Hemangioma]].
*[[Kaposi sarcoma]].
*[[Masson hemangioma]].
*[[Angiosarcoma]]
*[[Epithelioid hemangioendothelioma]].


==Angiosarcoma==
=Skeletal muscle tumours=
===General===
==Rhabdomyoma==
*Malignant tumour - with a horrible prognosis.<ref name=pmid20537949>{{cite journal |author=Young RJ, Brown NJ, Reed MW, Hughes D, Woll PJ |title=Angiosarcoma |journal=Lancet Oncol |volume= |issue= |pages= |year=2010 |month=May |pmid=20537949 |doi=10.1016/S1470-2045(10)70023-1 |url=}}</ref>
{{Main|Rhabdomyoma}}
*Classically on the scalp or head & neck.
*May arise secondary to therapeutic radiation or chronic lymphoedema related to breast carcinoma.


===Microscopic===
Features:
*Very many small capillaries of irregular shape lined with:
**Pleomorphic nuclei.
***May have hobnail morphology.
*Mitoses.
*Cytoplasmic vacuoles.
**Cells trying to form lumina - embryologic.
Notes:
*Epithelioid variant (with abundant cytoplasm & sheeting architecture) may resemble ''melanoma'' or ''hepatocellular carcinoma''.
===IHC===
*CD34 +ve.
*D2-40 +ve. (???)
*CD31 +ve.
==Hemangioendothelioma==
===General===
*Usually benign.
===Microscopic===
Features:<ref>Klatt. AOP P.23.</ref>
*Well-formed thin vascular channels on a fibrous stroma - '''key feature'''.
*+/-Thrombosis.
*+/-Calcification.
*+/-Fibrosis.
*+/-Myxoid change.
===IHC===
*Factor VIII +ve.
=Skeletal muscle tumours=
==Rhabdomyosarcoma==
==Rhabdomyosarcoma==
*Often abbreviated ''RMS''.
*Abbreviated ''RMS''.
*Most common paediatric sarcoma.
*~6% of all childhood cancer.
 
Histological subdivision:
#Alveolar rhabdomyosarcoma.
#*Usually young adults/adolescents.
#*Early mets common.
#Embryonal rhabdomyosarcoma.
#*Usual <10 years old.
#*Typically locally invasive.
 
Molecular and histologic subdivision:
#Translocation-positive alveolar RMS.
#Translocation-negative alveolar RMS.
#Embryonal RMS.
 
Notes:
*Translocation-negative alveolar RMS shares characteristics with ''embryonal RMS''.


===Microscopy===
{{Main|Rhabdomyosarcoma}}
Alveolar rhabdomyosarcoma:
Comes it two main flavours:
*Alveolus-like pattern:
*Alveolar rhabdomyosarcoma.
**Fibrous septae lined by tumour cells.
*Embryonal rhabdomyosarcoma.
***Space between fibrous sepate may be filled with tumour: ''solid variant of alveolar rhabdomyosarcoma''.
*Eccentric nucleus (???).
*Cytoplasm - dense pink staining on H&E (if well differentiated).
*Usu. nuclear pleomorphism +++.
*Mitoses common.


===Molecular diagnostics===
The histology may be that of a [[small round cell tumour]].
====Alveolar rhabdomyosarcoma====
Common translocations (~80%):
*t(1,13).
**PAX3/FKHR fusion gene.
*t(2,13).
**PAX7/FKHR fusion gene.


Several uncommon translocations exist.
=Chondro-osseous tumours=
{{Main|Chondro-osseous tumours}}


===IHC===
This grouping includes tumours derived from [[cartilage]] and [[bone]].
*Desmin (best marker).
*Actin.


=Tumours of uncertain differentiation=
=Tumours of uncertain differentiation=
==Clear cell sarcoma==
==Angiomatoid fibrous histiocytoma==
*Known among pathologists as "soft-tissue melanoma" and "melanoma of the soft parts", as it has a strong morphological resemblance.<ref name=pmid18300804>{{cite journal |author=Hisaoka M, Ishida T, Kuo TT, ''et al.'' |title=Clear cell sarcoma of soft tissue: a clinicopathologic, immunohistochemical, and molecular analysis of 33 cases |journal=Am. J. Surg. Pathol. |volume=32 |issue=3 |pages=452–60 |year=2008 |month=March |pmid=18300804 |doi=10.1097/PAS.0b013e31814b18fb |url=}}</ref>
{{Main|Angiomatoid fibrous histiocytoma}}
**Molecular changes and origin distinct from melanoma.
*Incidence: rare soft tissue tumour.


===Clinical===
==Aggressive angiomyxoma==
*Usually - deep soft tissue ''or'' extremities.
*[[AKA]] deep aggressive angiomyxoma.
*Guarded prognosis.
{{Main|Aggressive angiomyxoma}}
*First described in 1965.<ref>URL: [http://www.informaworld.com/smpp/723576818-750600/ftinterface~db=all~content=a789166263~fulltext=713240928 http://www.informaworld.com/smpp/723576818-750600/ftinterface~db=all~content=a789166263~fulltext=713240928]. Accessed on: 5 May 2010.</ref>


===Microscopy===
==Angiomyofibroblastoma==
Features:<ref name=pmid18300804/>
{{Main|Angiomyofibroblastoma}}
*Architecture: sheets or fascicular (bundles) arrangement.
*Cells: Spindle cells or epithelioid cells.
*Prominent nucleoli - basophilic.
*Fibrous septae.
*Uniform


Image:
==Extrarenal malignant rhabdoid tumour==
*[http://commons.wikimedia.org/wiki/File:Clear_cell_sarcoma.Image12.jpg Clear cell sarcoma (WC)].
*Essentially identical to ''[[renal malignant rhabdoid tumour]]''.<ref name=Ref_WMSP627>{{Ref WMSP|627}}</ref>
*[http://www.informaworld.com/ampp/image?path=/713690780/789166263/sonc_a_284443_o_f0003g.jpeg Clear cell sarcoma (informaworld.com)].
{{Main|Extrarenal malignant rhabdoid tumour}}


===IHC===
==Ewing sarcoma/PNET==
Features:<ref name=pmid18300804/>
{{Main|Ewing sarcoma}}
*S100 +ve.
*A [[small round blue cell tumour]] that may be seen in [[bone]]. It is discussed in the context of [[bone tumours]].
*HMB-45 +ve.
*Melan A (MART-1) +ve; sometimes -ve.
*BCL2 +ve.
*CD57 +ve (usually).


Keratins:
==Epithelioid sarcoma==
*EMA may be +ve.
:Sarcomas with an epithelioid morphology are covered in ''[[epithelioid sarcomas]]''.
*CAM5.2 -ve.
{{Main|Epithelioid sarcoma}}
*AE1/AE3 -ve.


===Molecular studies===
==Alveolar soft part sarcoma==
*Chromosomal translocation t(12;22)(q13;q12).<ref name=pmid18300804/>
{{Main|Alveolar soft part sarcoma}}
**Fusion transcripts:
***EWSR1-ATF1.
***EWSR1-CREB1 (GI tract associated).


==Chondrosarcoma==
==Desmoplastic small round cell tumour==
*May arise from an ''enchondroma''.
{{Main|Desmoplastic small round cell tumour}}
*Usually a good prognosis.


===Microscopic===
==Clear cell sarcoma==
Features:
{{Main|Clear cell sarcoma}}
*Resembles cartilage at low power.<ref>Klatt. AOP P.417.</ref>
*More cellular than cartilage... but relatively paucicellular compared to other sarcomas.
 
Images:
*[http://commons.wikimedia.org/wiki/File:Chondrosarcoma_(1).jpg Chondrosarcoma - low mag. (WC)].
*[http://commons.wikimedia.org/wiki/File:Chondrosarcoma_(2).jpg Chondrosarcoma - high mag. (WC)].
*[http://commons.wikimedia.org/wiki/File:Chondrosarcoma_(3).jpg Chondrosarcoma - high mag. (WC)].
 
====Grading====
Features:<ref name=Ref_WMSP643>{{Ref WMSP|643}}</ref>
*Grade I: moderate cellularity +/- binucleated cells.
*Grade III: nuclear pleomorphism, mitoses common.
*Grade II: between Grade I and Grade III.


==Synovial sarcoma==
==Synovial sarcoma==
===General===
{{Main|Synovial sarcoma}}
*Does not arise from cartilage.<ref name=Ref_WMSP627>{{Ref WMSP|627}}</ref>
*Young adults or adolescents.
 
===Microscopic===
Comes in three flavours:<ref name=Ref_WMSP627>{{Ref WMSP|627}}</ref><ref>{{cite journal |author=Schaal CH, Navarro FC, Moraes Neto FA |title=Primary renal sarcoma with morphologic and immunohistochemical aspects compatible with synovial sarcoma |journal=Int Braz J Urol |volume=30 |issue=3 |pages=210–3 |year=2004 |pmid=15689250 |doi= |url=http://www.brazjurol.com.br/may_june_2004/Schaal_ing_210_213.htm}}</ref>
#Spindle cell sarcoma with features of hemangiopericytoma, i.e. staghorn vessels.
#Biphasic synovial sarcoma:
##Spindle cells with features of hemangiopericytoma.
##Epitheliod glands or nests.
#Primative round cell type.
 
Images:
*[http://www.scielo.br/img/revistas/ibju/v30n3/3a06f03.jpg Synovial sarcoma (scielo.br)].
*[http://www.humpath.com/spip.php?page=article&id_article=1965 Synovial sarcoma - collection of images (humpath.com)].
 
===IHC===
Features:<ref name=Ref_WMSP627>{{Ref WMSP|627}}</ref>
*Vimentin +ve + cytokeratin and/or EMA +ve.
*CD99 +ve.
 
Others:
*Beta-catenin +ve ~30-70%.<ref name=pmid16740029>{{cite journal |author=Horvai AE, Kramer MJ, O'Donnell R |title=Beta-catenin nuclear expression correlates with cyclin D1 expression in primary and metastatic synovial sarcoma: a tissue microarray study |journal=Arch. Pathol. Lab. Med. |volume=130 |issue=6 |pages=792–8 |year=2006 |month=June |pmid=16740029 |doi= |url=}}</ref>
*Cyclin D1 ~50%.<ref name=pmid16740029/><ref name=pmid15375433>{{cite journal |author=Ng TL, Gown AM, Barry TS, ''et al.'' |title=Nuclear beta-catenin in mesenchymal tumors |journal=Mod. Pathol. |volume=18 |issue=1 |pages=68–74 |year=2005 |month=January |pmid=15375433 |doi=10.1038/modpathol.3800272 |url=}}</ref>


===Molecular pathology===
=Other=
Unique translocation:
==Granulocytic sarcoma==
*t(X;18)(p11.2;q11.2).<ref>URL: [http://www.ncbi.nlm.nih.gov/omim/300813 http://www.ncbi.nlm.nih.gov/omim/300813]. Accessed on: 30 May 2010.</ref>
*Common alternate terms: extramedullary leukemia,<ref name=pmid21795742>{{Cite journal  | last1 = Bakst | first1 = RL. | last2 = Tallman | first2 = MS. | last3 = Douer | first3 = D. | last4 = Yahalom | first4 = J. | title = How I treat extramedullary acute myeloid leukemia. | journal = Blood | volume = 118 | issue = 14 | pages = 3785-93 | month = Oct | year = 2011 | doi = 10.1182/blood-2011-04-347229 | PMID = 21795742 }}</ref> myeloid sarcoma, chloroma.
*Other terms:<ref name=pmid21556238>{{Cite journal  | last1 = Eom | first1 = KS. | last2 = Kim | first2 = TY. | title = Intraparenchymal myeloid sarcoma and subsequent spinal myeloid sarcoma for acute myeloblastic leukemia. | journal = J Korean Neurosurg Soc | volume = 49 | issue = 3 | pages = 171-4 | month = Mar | year = 2011 | doi = 10.3340/jkns.2011.49.3.171 | PMID = 21556238 | PMC = 3085814 | url = http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3085814/ }}</ref> myeloblastoma, chloromyeloma, chloromyelosarcoma, granulocytic leukosarcoma, or myelosarcoma.
{{Main|Granulocytic sarcoma}}


=See also=
=See also=
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{{reflist|2}}
{{reflist|2}}


[[Category:Weird stuff]]
[[Category:Soft tissue lesions]]
Michael
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