Difference between revisions of "Bone"

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=Normal bone=
=Normal bone=
==Bone==
==Bone anatomy==
===Anatomy===
*Epiphysis = rounded end of the bone.
*Epiphysis = rounded end of the bone.
*Metaphysis = between epiphysis and diaphysis; contains ''epiphyseal plate'' - site of growth in childhood.
*Metaphysis = between epiphysis and diaphysis; contains ''epiphyseal plate'' - site of growth in childhood.
*Diaphysis = shaft, mid-portion, contains [[bone marrow]].
*Diaphysis = shaft, mid-portion, contains [[bone marrow]].


Image:
===Image===
*[http://commons.wikimedia.org/wiki/File:EpiMetaDiaphyse.jpg Bone (WC)].
<gallery>
Image:EpiMetaDiaphyse.jpg | Bone. (WC)
</gallery>


===Matrix===
==Bone histology==
Two types (based on arrangement of collagen):
Two types (based on arrangement of collagen):
#Woven.
# Woven bone.
#*Always abnormal in adults.
# Lamellar bone.
#*Collagen arranged haphazardly - mechanically weak.  
#Lamellar.
#*Collagen organized in layers (lamellae).


Woven vs. lamellar:
===Woven bone===
*Easiest way to differentiate: polarize; lamellar bone has well-defined layers.
*Always abnormal in adults.
*Collagen arranged haphazardly - mechanically weak.  


Images:
Images:
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*[http://www.brown.edu/Courses/Digital_Path/systemic_path/bone/paget.html Woven bone (brown.edu)].
*[http://www.brown.edu/Courses/Digital_Path/systemic_path/bone/paget.html Woven bone (brown.edu)].


===Cells===
===Lamellar bone===
[[File:Lamella bone H&E and under polarised light.gif|thumb|Animated GIF showing a photomicrograph of lamellar bone. The layers are accentuated under polarised light.]]
*Collagen organized in layers (lamellae).
 
===Woven versus lamellar===
*Easiest way to differentiate: polarize; lamellar bone has well-defined layers.
 
==Bone cells==
*Osteocytes.
*Osteocytes.
**Sit in lacunae.
**Sit in lacunae.
Line 42: Line 48:
==Bone marrow==
==Bone marrow==
{{Main|Haematopoiesis}}
{{Main|Haematopoiesis}}
===General===
*One of two ''[[primary lymphoid organs]]'' - the other one is the [[thymus]].<ref>URL: [http://www.life.umd.edu/classroom/bsci423/song/Lab1.html http://www.life.umd.edu/classroom/bsci423/song/Lab1.html]. Accessed on: 28 March 2012.</ref>
*One of two ''[[primary lymphoid organs]]'' - the other one is the [[thymus]].<ref>URL: [http://www.life.umd.edu/classroom/bsci423/song/Lab1.html http://www.life.umd.edu/classroom/bsci423/song/Lab1.html]. Accessed on: 28 March 2012.</ref>
Bone marrow biopsy adequacy:<ref name=pmid16477878>{{Cite journal  | last1 = Rudzki | first1 = Z. | last2 = Partyła | first2 = T. | last3 = Okoń | first3 = K. | last4 = Stachura | first4 = J. | title = Adequacy of trephine bone marrow biopsies: the doctor and the patient make a difference. | journal = Pol J Pathol | volume = 56 | issue = 4 | pages = 187-95 | month =  | year = 2005 | doi =  | PMID = 16477878 }}</ref>
*10 intertrabecular spaces or 10 mm.
===Microscopic===
One should see three cell lines:<ref>URL: [http://emedicine.medscape.com/article/199003-overview http://emedicine.medscape.com/article/199003-overview]. Accessed on: 28 March 2012.</ref>
#Erythroid (red cells).
#Myeloid (white blood cells).
#Megakaryocytic (platelets).
Adipose tissue:
*Fat content (%) ~= age in years.<ref>IAV. 26 Feb 2009.</ref>
*Fat content (%) ~= age in years.<ref>IAV. 26 Feb 2009.</ref>
**e.g. 60 year old will have 60% fatty replacement.
**e.g. 60 year old will have 60% fatty replacement.


*One should see three cell lines:<ref>URL: [http://emedicine.medscape.com/article/199003-overview http://emedicine.medscape.com/article/199003-overview]. Accessed on: 28 March 2012.</ref>
Identifying the cell lines:<ref>[http://upload.wikimedia.org/wikipedia/commons/6/69/Hematopoiesis_%28human%29_diagram.png http://upload.wikimedia.org/wikipedia/commons/6/69/Hematopoiesis_%28human%29_diagram.png]</ref>
*#Erythroid (red cells).
*#Myeloid (white blood cells).
*#Megakaryocytic (platelets).
 
Note: Lymphocytes are considered separately and typically spared in bone marrow failure.<ref>[http://emedicine.medscape.com/article/199003-overview http://emedicine.medscape.com/article/199003-overview]</ref>
 
Identifying the lines:<ref>[http://upload.wikimedia.org/wikipedia/commons/6/69/Hematopoiesis_%28human%29_diagram.png http://upload.wikimedia.org/wikipedia/commons/6/69/Hematopoiesis_%28human%29_diagram.png]</ref>
#Megakaryocytes:
#Megakaryocytes:
#*Big cells ~ 3x the size of a [[RBC]].
#*Big cells ~ 3x the size of a [[RBC]].
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#*Reniform nucleus, i.e. kidney bean shaped nucleus.
#*Reniform nucleus, i.e. kidney bean shaped nucleus.


Images:
Note:  
*[http://commons.wikimedia.org/wiki/File:Bone_marrow_WBC.JPG Myeloid line (WC)].
*Lymphocytes are considered separately and typically spared in bone marrow failure.<ref>[http://emedicine.medscape.com/article/199003-overview http://emedicine.medscape.com/article/199003-overview]</ref>
 
====Organization====
====Organization====
*Mature hematopoeitic cells at the centre (distant from bone).
*Mature hematopoeitic cells at the centre (distant from bone).
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*Immediately adjacent to the bone (paratrabecular)... is where [[follicular lymphoma]] is classically found.<ref name=pmid17284114>{{Cite journal  | last1 = Iancu | first1 = D. | last2 = Hao | first2 = S. | last3 = Lin | first3 = P. | last4 = Anderson | first4 = SK. | last5 = Jorgensen | first5 = JL. | last6 = McLaughlin | first6 = P. | last7 = Medeiros | first7 = LJ. | title = Follicular lymphoma in staging bone marrow specimens: correlation of histologic findings with the results of flow cytometry immunophenotypic analysis. | journal = Arch Pathol Lab Med | volume = 131 | issue = 2 | pages = 282-7 | month = Feb | year = 2007 | doi = 10.1043/1543-2165(2007)131[282:FLISBM]2.0.CO;2 | PMID = 17284114 }}</ref>
*Immediately adjacent to the bone (paratrabecular)... is where [[follicular lymphoma]] is classically found.<ref name=pmid17284114>{{Cite journal  | last1 = Iancu | first1 = D. | last2 = Hao | first2 = S. | last3 = Lin | first3 = P. | last4 = Anderson | first4 = SK. | last5 = Jorgensen | first5 = JL. | last6 = McLaughlin | first6 = P. | last7 = Medeiros | first7 = LJ. | title = Follicular lymphoma in staging bone marrow specimens: correlation of histologic findings with the results of flow cytometry immunophenotypic analysis. | journal = Arch Pathol Lab Med | volume = 131 | issue = 2 | pages = 282-7 | month = Feb | year = 2007 | doi = 10.1043/1543-2165(2007)131[282:FLISBM]2.0.CO;2 | PMID = 17284114 }}</ref>
**Image: [http://www.flickr.com/photos/euthman/5691578596/in/set-72057594114099781 Paratrabecular follicular lymphoma (flickr.com)].
**Image: [http://www.flickr.com/photos/euthman/5691578596/in/set-72057594114099781 Paratrabecular follicular lymphoma (flickr.com)].
===Images===
<gallery>
Image:Bone_marrow_WBC.JPG| Myeloid line. (WC)
</gallery>
===Sign out===
====Essentially normal====
<pre>
Bone Marrow, Posterior Superior Iliac Spine, Biopsy:
- Bone marrow with trilineage hematopoiesis.
- Cellularity within normal limits for age.
- Case will be sent to hematology for consultation and correlation
  with other testing.
</pre>
====Inadequate====
<pre>
Right Posterior Superior Iliac Spine, Bone Marrow Biopsy:
- Predominantly benign dense fibrous tissue with a small
  amount of laminar bone, and minute fragment of marrow (<2 mm).
- Case will be sent to hematopathology for further assessment.
</pre>


=Benign variants=
=Benign variants=
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=Infections=
=Infections=
==Osteomyelitis==
==Acute osteomyelitis==
General
===General===
Pathophysiology/entry:
*Hematogenous - often in children.
*Hematogenous - often in children.
*Direct entry (skin defect) - adults with diabetes.
*Direct entry (skin defect) - adults with diabetes.


===Microscopic===
===Microscopic===
Features:
*[[PMN]]s.
*[[PMN]]s.
*Micro-organisms - esp. cocci.
Image:
*[http://osteomyelitis.stanford.edu/pages/histo_002.html Acute osteomyeelitis (stanford.edu)].
===Stains===
*[[Gram stain]].


==Chronic osteomyelitis==
==Chronic osteomyelitis==
===General===
Most common organism:
*''Staphylococcus aureus''.<ref name=pmid22046943>{{Cite journal  | last1 = Hatzenbuehler | first1 = J. | last2 = Pulling | first2 = TJ. | title = Diagnosis and management of osteomyelitis. | journal = Am Fam Physician | volume = 84 | issue = 9 | pages = 1027-33 | month = Nov | year = 2011 | doi =  | PMID = 22046943 | URL = http://www.aafp.org/link_out?pmid=22046943 }}</ref>
Risk factors:<ref name=pmid22046943/>
*[[Diabetes mellitus]].
*Peripheral vascular disease.
===Microscopic===
===Microscopic===
Features:
Features:
*Plasma cells.
*Plasma cells - '''key feature'''.
**May be sterile, i.e. no organisms.
**May be sterile, i.e. no organisms.
*+/-Fibrosis.
*+/-Necrotic bone - bone with empty lacunae.
*+/-[[Amyloid]].  
*+/-[[Amyloid]].  
**~10% of patients in one series.<ref name=pmid2071276>{{Cite journal  | last1 = Alabi | first1 = ZO. | last2 = Ojo | first2 = OS. | last3 = Odesanmi | first3 = WO. | title = Secondary amyloidosis in chronic osteomyelitis. | journal = Int Orthop | volume = 15 | issue = 1 | pages = 21-2 | month =  | year = 1991 | doi =  | PMID = 2071276 }}</ref>
**~10% of patients in one series.<ref name=pmid2071276>{{Cite journal  | last1 = Alabi | first1 = ZO. | last2 = Ojo | first2 = OS. | last3 = Odesanmi | first3 = WO. | title = Secondary amyloidosis in chronic osteomyelitis. | journal = Int Orthop | volume = 15 | issue = 1 | pages = 21-2 | month =  | year = 1991 | doi =  | PMID = 2071276 }}</ref>
Image:
*[http://osteomyelitis.stanford.edu/pages/histo_001.html Chronic osteomyelitis (stanford.edu)].
===Sign out===
<pre>
LOWER LEG, RIGHT, BELOW KNEE AMPUTATION:
- ACUTE AND CHRONIC OSTEOMYELITIS.
- MODERATE ATHEROSCLEROSIS.
- SKIN ULCERATION.
- SOFT TISSUE SURGICAL MARGIN WITH FAT NECROSIS AND MUSCULAR ATROPHY.
- NEGATIVE FOR MALIGNANCY.
</pre>
<pre>
TRAPEZIUM, RIGHT HAND, REMOVAL:
- DEGENERATIVE JOINT DISEASE.
- MARROW SPACE WITH FIBROSIS AND SCATTERED LYMPHOCYTES AND PLASMA CELLS,
  COMPATIBLE WITH MILD CHRONIC OSTEOMYELITIS.
- NO MICROORGANISMS APPARENT WITH ROUTINE STAINS.
- NEGATIVE FOR MALIGNANCY.
</pre>


=Bone tumours=
=Bone tumours=
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A general DDx for cystic bone lesions is found on ''radipedia.com''.<ref>URL: [http://radipedia.com/WikiMedia/index.php?title=Benign_cystic_bone_lesions http://radipedia.com/WikiMedia/index.php?title=Benign_cystic_bone_lesions]. Accessed on: 15 March 2011.</ref>
A general DDx for cystic bone lesions is found on ''radipedia.com''.<ref>URL: [http://radipedia.com/WikiMedia/index.php?title=Benign_cystic_bone_lesions http://radipedia.com/WikiMedia/index.php?title=Benign_cystic_bone_lesions]. Accessed on: 15 March 2011.</ref>
==Sequestrum==
{{Main|Sequestrum}}


==Osteoarthritis==
==Osteoarthritis==
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==Aneurysmal bone cyst==
==Aneurysmal bone cyst==
*Abbreviated ''ABC''.
{{Main|Aneurysmal bone cyst}}
:''Also see [[giant cell reparative granuloma]]'' ([[AKA]] ''solid aneurysmal bone cyst'').
 
===General===
Features:<ref name=emed_abc>URL: [http://emedicine.medscape.com/article/1254784-overview http://emedicine.medscape.com/article/1254784-overview]. Accessed on: 4 February 2011.</ref>
*Benign.
**May grow rapidly.
*Osteolysis -> cystic space -> filled with blood.
*Relatively common; in children second only to osteosarcoma.<ref>{{cite journal |author=van den Berg H, Kroon HM, Slaar A, Hogendoorn P |title=Incidence of biopsy-proven bone tumors in children: a report based on the Dutch pathology registration "PALGA" |journal=J Pediatr Orthop |volume=28 |issue=1 |pages=29–35 |year=2008 |pmid=18157043 |doi=10.1097/BPO.0b013e3181558cb5 |url=}}</ref>
 
===Microscopic===
Features:<ref name=emed_abc/>
*Bony trabeculae ''or'' osteoid tissue.
*Osteoclast giant cells.
**Multi-nucleated giant-cells with round randomly arranged nuclei.
*Benign spindle cells (fibroblasts) - surround bone/adjacent to the giant cells - '''important'''.
*Blood +/- surrounded by giant cells.
 
DDx:
*[[Giant cell tumour of bone]] - the nuclei of the cells surrounding the giant cells are similar to those in the giant cells (round nuclei).
*Telangiectatic [[osteosarcoma]].
*Other [[giant cell lesions]].
 
Images:
*[http://www.webpathology.com/image.asp?n=4&Case=344 ABC - low mag. (webpathology.com)].
*[http://www.webpathology.com/image.asp?n=5&Case=344 ABC - intermed. mag. (webpathology.com)].
*[http://www.webpathology.com/image.asp?case=344&n=6 ABC - high mag. (webpathology.com)].


==Myositis ossificans==
==Myositis ossificans==
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**Lesion is well-circumscribed.
**Lesion is well-circumscribed.
**Normal muscle is adjacent to the lesion - '''key feature'''.
**Normal muscle is adjacent to the lesion - '''key feature'''.
DDx:
*[[Heterotopic ossification]] - bone, not cellular, no inflammation.


Images:
Images:
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==Paget disease of the bone==
==Paget disease of the bone==
===General===
{{Main|Paget's disease of the bone}}
*Benign - unlike [[Paget disease of the breast]].
*Afflicts ~ 3% of population > 55 years old.<ref name=pmid22396921/>
*Leading cause of ''secondary [[osteosarcoma]]''.
*Uncommonly associated with [[giant cell tumour of bone]].<ref name=pmid17437100>{{Cite journal  | last1 = Hoch | first1 = B. | last2 = Hermann | first2 = G. | last3 = Klein | first3 = MJ. | last4 = Abdelwahab | first4 = IF. | last5 = Springfield | first5 = D. | title = Giant cell tumor complicating Paget disease of long bone. | journal = Skeletal Radiol | volume = 36 | issue = 10 | pages = 973-8 | month = Oct | year = 2007 | doi = 10.1007/s00256-007-0310-x | PMID = 17437100 }}</ref><ref name=pmid21319038>{{Cite journal  | last1 = Karakida | first1 = K. | last2 = Ota | first2 = Y. | last3 = Aoki | first3 = T. | last4 = Akamatsu | first4 = T. | last5 = Kajiwara | first5 = H. | last6 = Hirabayashi | first6 = K. | title = Multiple giant cell tumors in maxilla and skull complicating Paget's disease of bone. | journal = Tokai J Exp Clin Med | volume = 35 | issue = 3 | pages = 112-7 | month = Sep | year = 2010 | doi =  | PMID = 21319038 }}</ref>
*[[Diagnosis]] based on radiology.<ref name=pmid22396921/>
 
Classically divided into three phases:<ref name=emed_paget>URL: [http://emedicine.medscape.com/article/311688-overview http://emedicine.medscape.com/article/311688-overview]. Accessed on: 25 December 2010.</ref><ref>URL: [http://radiopaedia.org/articles/paget-disease-of-bone-1 http://radiopaedia.org/articles/paget-disease-of-bone-1]. Accessed on: 25 December 2010.</ref>
#Lytic (predominantly osteoclasts).
#Mixed lytic (osteoclastic) and blastic (osteoblastic).
#Sclerotic (burned-out).
 
====Clinical====
Presentation:<ref name=pmid22396921>{{Cite journal  | last1 = Britton | first1 = C. | last2 = Walsh | first2 = J. | title = Paget disease of bone - an update. | journal = Aust Fam Physician | volume = 41 | issue = 3 | pages = 100-3 | month = Mar | year = 2012 | doi =  | PMID = 22396921 | URL = http://www.racgp.org.au/afp/201203/201203britton.pdf }}</ref>
*[[Fracture of bone|Fracture]].
*Bone pain.
*Bony deformity.
*Deafness.
*Incidental finding - radiologic or biochemical.
 
Serology:
*Elevated ALP.
 
===Microscopic===
Features:<ref name=emed_paget>URL: [http://emedicine.medscape.com/article/311688-overview http://emedicine.medscape.com/article/311688-overview]. Accessed on: 25 December 2010.</ref>
*Bone matrix has jigsaw-puzzle like pattern.
**Jigsaw-puzzle pieces each ~ 100-500 micrometres in size (largest dimension).
*Increased osteoclast activity.
**Osteoclast = macrophage that reabsorbs bone matrix.
 
Images:
*[http://commons.wikimedia.org/wiki/File:Paget_disease_of_bone_-_high_mag.jpg Paget disease - bone - high mag. (WC)].
*[http://commons.wikimedia.org/wiki/File:Paget_disease_of_bone_-_intermed_mag.jpg Paget disease - bone - intermed. mag. (WC)].


==Fibrous dysplasia==
==Fibrous dysplasia==
*[[AKA]] ''osteitis fibrosa''.
*[[AKA]] ''osteitis fibrosa''.
===General===
{{Main|Fibrous dysplasia}}
Classification:
*''Monostotic'' - one bone involved, ~80% of cases.
*''Polyostotic'' - several bones involved, ~20% of cases.
**May be associated with [[McCune-Albright syndrome]].
 
===Microscopic===
Features:<ref>URL: [http://www.pathologypics.com/pictview.aspx?id=104 http://www.pathologypics.com/pictview.aspx?id=104]. Accessed on: 14 April 2011.</ref>
*Woven bone with odd irregular shapes - '''key feature'''.
**Described as "chinese characters".<ref>URL: [http://www.pathcases.com/bone_tumors_and_tumor.htm http://www.pathcases.com/bone_tumors_and_tumor.htm]. Accessed on: 31 May 2011.</ref>
*Fibrous tissue around bone.
 
Notes:
*No osteoblastic rimming.
 
DDx:
*[[Desmoplastic fibroma]] - has lamellar bone.
*Low grade [[fibrosarcoma]].
 
Images:
*[[WC]]:
**[http://commons.wikimedia.org/wiki/File:Fibrous_dysplasia_-_low_mag.jpg Fibrous dysplasia - low mag. (WC)].
**[http://commons.wikimedia.org/wiki/File:Fibrous_dysplasia_-_intermed_mag.jpg Fibrous dysplasia - intermed. mag. (WC)].
**[http://commons.wikimedia.org/wiki/File:Fibrous_dysplasia_-_high_mag.jpg Fibrous dysplasia - high mag. (WC)].
*www:
**[http://www.pathologypics.com/pictview.aspx?id=104 Fibrous dysplasia of bone - high mag. (pathologypics.com)].
**[http://www.pathologypics.com/BigPicViewer.aspx?PictureID=103 Fibrous dysplasia of bone - low mag. (pathologypics.com)].


==Desmoplastic fibroma==
==Desmoplastic fibroma==
Line 250: Line 245:
DDx:
DDx:
*[[Fibrous dysplasia]] - has woven bone.
*[[Fibrous dysplasia]] - has woven bone.
*Low grade fibrosarcoma.
*Low grade [[fibrosarcoma]].


==Gaucher disease==
==Gaucher disease==
Line 290: Line 285:
*[[Giant cell tumour of bone]].
*[[Giant cell tumour of bone]].


Images:
====Images====
*[http://commons.wikimedia.org/wiki/File:Central_giant_cell_granuloma_-_intermed_mag.jpg CGCG - intermed. mag. (WC)].
<gallery>
*[http://commons.wikimedia.org/wiki/File:Central_giant_cell_granuloma_-_high_mag.jpg CGCG - high mag. (WC)].
Image:Central_giant_cell_granuloma_-_intermed_mag.jpg | CGCG - intermed. mag. (WC/Nephron)
 
Image:Central_giant_cell_granuloma_-_high_mag.jpg | CGCG - high mag. (WC/Nephron)
</gallery>
===Molecular===
===Molecular===
Recurrent [[chromosomal translocation]]:<ref name=pmid22285042/>
Recurrent [[chromosomal translocation]]:<ref name=pmid22285042/>
Line 303: Line 299:
*Rare.
*Rare.
*Genetic - may be autosomal dominant, autosomal recessive or X-linked.<ref name=pmid19232111/>
*Genetic - may be autosomal dominant, autosomal recessive or X-linked.<ref name=pmid19232111/>
*Pancytopenias - due to oblieration of the marrow space.
*[[bone fractures|Fractures]].
*Radiologic diagnosis.


===Gross===
===Gross===
*Marbled appearance.
*Marbled appearance.
*Thickening with obliteration of the marrow space.
*Patchy (brown) surface due to vascularization/[[extramedullary hematopoiesis]].<ref name=Ref_AoGP469>{{Ref AoGP|469}}</ref>


Image:
Image:
Line 311: Line 312:


===Microscopic===
===Microscopic===
Features:
Features:<ref name=pmid11264157/>
*Abundant irregular (pink) bony trabeculae with layers of (blue-gray) [[cartilage]].


Image:
Image:
Line 319: Line 321:
===General===
===General===
*Very common.
*Very common.
*Associated with [[bone fractures|fractures]], esp. wrist, [[traumatic hip fracture|hip]] & vertebra.<ref name=pmid22537071>{{Cite journal  | last1 = Lix | first1 = LM. | last2 = Azimaee | first2 = M. | last3 = Acan Osman | first3 = B. | last4 = Caetano | first4 = P. | last5 = Morin | first5 = S. | last6 = Metge | first6 = C. | last7 = Goltzman | first7 = D. | last8 = Kreiger | first8 = N. | last9 = Prior | first9 = J. | title = Osteoporosis-related fracture case definitions for population-based administrative data. | journal = BMC Public Health | volume = 12 | issue = 1 | pages = 301 | month = Apr | year = 2012 | doi = 10.1186/1471-2458-12-301 | PMID = 22537071 }}</ref>
*Radiologic diagnosis - bone mineral density.
Etiology:<ref name=Ref_PCPBoD8_617>{{Ref PCPBoD8|617}}</ref>
*Primary (senile).
*Secondary:
**Endocrine:
***Hyperparathyroidism.
**Gastrointestinal:
***Malabsorption, e.g. [[celiac disease]], [[cystic fibrosis]], [[Crohn's disease]].
***Starvation.
**Psychiatric:
***Anorexia nervosa.
***Bulimia nervosa.
**Neoplasia:
***[[Multiple myeloma]].
**Drugs:
***Systemic steroids.<ref name=pmid16243531>{{Cite journal  | last1 = Dalle Carbonare | first1 = L. | last2 = Bertoldo | first2 = F. | last3 = Valenti | first3 = MT. | last4 = Zenari | first4 = S. | last5 = Zanatta | first5 = M. | last6 = Sella | first6 = S. | last7 = Giannini | first7 = S. | last8 = Cascio | first8 = VL. | title = Histomorphometric analysis of glucocorticoid-induced osteoporosis. | journal = Micron | volume = 36 | issue = 7-8 | pages = 645-52 | month =  | year = 2005 | doi = 10.1016/j.micron.2005.07.009 | PMID = 16243531 }}</ref>
===Gross===
*Decreased numbers of, abnormally thin, bony spicules.
Images:
*[http://www.sciencephoto.com/media/260363/enlarge Osteoporosis (sciencephoto.com)].
*[http://library.med.utah.edu/WebPath/TUTORIAL/OSTEO/OST005.html Osteoporosis (utah.edu)].


===Microscopic===
===Microscopic===
Features:
Features (femoral neck):<ref name=pmid18708176>{{Cite journal  | last1 = Blain | first1 = H. | last2 = Chavassieux | first2 = P. | last3 = Portero-Muzy | first3 = N. | last4 = Bonnel | first4 = F. | last5 = Canovas | first5 = F. | last6 = Chammas | first6 = M. | last7 = Maury | first7 = P. | last8 = Delmas | first8 = PD. | title = Cortical and trabecular bone distribution in the femoral neck in osteoporosis and osteoarthritis. | journal = Bone | volume = 43 | issue = 5 | pages = 862-8 | month = Nov | year = 2008 | doi = 10.1016/j.bone.2008.07.236 | PMID = 18708176 }}</ref>
*Thinner cortex.
*Decreased trabecular thickness
*Decreased number of trabeculae.
 
Note:
*One study looking at iliac bone biopsies suggests trabeculae are no different in osteoporosis.<ref name=pmid3414359>{{Cite journal  | last1 = Chappard | first1 = D. | last2 = Alexandre | first2 = C. | last3 = Riffat | first3 = G. | title = Spatial distribution of trabeculae in iliac bone from 145 osteoporotic females. | journal = Acta Anat (Basel) | volume = 132 | issue = 2 | pages = 137-42 | month =  | year = 1988 | doi =  | PMID = 3414359 }}</ref>


=See also=
=See also=
Line 327: Line 360:
*[[Chondro-osseous tumours]].
*[[Chondro-osseous tumours]].
*[[Femoral head]].
*[[Femoral head]].
*[[Spine]].
*[[Hematopathology]].
*[[Hematopathology]].
*[[Soft tissue lesions]].
*[[Soft tissue lesions]].
Line 334: Line 368:
{{reflist|2}}
{{reflist|2}}


[[Category:Weird stuff]]
=External links=
*[http://www.medicalhistology.us/twiki/bin/view/Main/CartilageAndBoneAtlas08 Bone and cartilage histology (medicalhistology.us)].
 
[[Category:Bone]]

Latest revision as of 21:39, 23 June 2018

Bone is a scaffold it bears weight and occasionally gets infected.

Tumours often spread to bone and occasionally arise in bone. Bone tumours are dealt with in the bone tumours article.

Normal bone

Bone anatomy

  • Epiphysis = rounded end of the bone.
  • Metaphysis = between epiphysis and diaphysis; contains epiphyseal plate - site of growth in childhood.
  • Diaphysis = shaft, mid-portion, contains bone marrow.

Image

  • Bone. (WC)

Bone histology

Two types (based on arrangement of collagen):

  1. Woven bone.
  2. Lamellar bone.

Woven bone

  • Always abnormal in adults.
  • Collagen arranged haphazardly - mechanically weak.

Images:

Lamellar bone

Animated GIF showing a photomicrograph of lamellar bone. The layers are accentuated under polarised light.
  • Collagen organized in layers (lamellae).

Woven versus lamellar

  • Easiest way to differentiate: polarize; lamellar bone has well-defined layers.

Bone cells

  • Osteocytes.
    • Sit in lacunae.
      • Empty lacunae = necrotic bone.
  • Osteoblasts.
    • Make bone.
  • Osteoclasts.
    • Destroy bone.
    • Multinucleated.

Memory device: 'b' before 'c'.

Bone marrow

Main article: Haematopoiesis

General

Bone marrow biopsy adequacy:[3]

  • 10 intertrabecular spaces or 10 mm.

Microscopic

One should see three cell lines:[4]

  1. Erythroid (red cells).
  2. Myeloid (white blood cells).
  3. Megakaryocytic (platelets).

Adipose tissue:

  • Fat content (%) ~= age in years.[5]
    • e.g. 60 year old will have 60% fatty replacement.

Identifying the cell lines:[6]

  1. Megakaryocytes:
    • Big cells ~ 3x the size of a RBC.
  2. Normoblasts (RBC precursors):
    • Hyperchromatic, i.e. blue, nucleus.
  3. Myeloid line:
    • Granules.
    • Reniform nucleus, i.e. kidney bean shaped nucleus.

Note:

  • Lymphocytes are considered separately and typically spared in bone marrow failure.[7]

Organization

  • Mature hematopoeitic cells at the centre (distant from bone).
  • Immature hematopoeitic cells adjacent to the bone.

Note:

Images

  • Myeloid line. (WC)

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Essentially normal

Bone Marrow, Posterior Superior Iliac Spine, Biopsy:
- Bone marrow with trilineage hematopoiesis.
- Cellularity within normal limits for age.
- Case will be sent to hematology for consultation and correlation 
  with other testing.

Inadequate

Right Posterior Superior Iliac Spine, Bone Marrow Biopsy:
- Predominantly benign dense fibrous tissue with a small 
  amount of laminar bone, and minute fragment of marrow (<2 mm).
- Case will be sent to hematopathology for further assessment.

Benign variants

Hyperostosis frontalis interna

  • Extra-thick frontal bone.[9]
  • No clinical significance -- just has to be recognized as a "nothing".

Infections

Acute osteomyelitis

General

Pathophysiology/entry:

  • Hematogenous - often in children.
  • Direct entry (skin defect) - adults with diabetes.

Microscopic

Features:

  • PMNs.
  • Micro-organisms - esp. cocci.

Image:

Stains

Chronic osteomyelitis

General

Most common organism:

  • Staphylococcus aureus.[10]

Risk factors:[10]

Microscopic

Features:

  • Plasma cells - key feature.
    • May be sterile, i.e. no organisms.
  • +/-Fibrosis.
  • +/-Necrotic bone - bone with empty lacunae.
  • +/-Amyloid.
    • ~10% of patients in one series.[11]

Image:

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LOWER LEG, RIGHT, BELOW KNEE AMPUTATION:
- ACUTE AND CHRONIC OSTEOMYELITIS.
- MODERATE ATHEROSCLEROSIS.
- SKIN ULCERATION.
- SOFT TISSUE SURGICAL MARGIN WITH FAT NECROSIS AND MUSCULAR ATROPHY.
- NEGATIVE FOR MALIGNANCY.

TRAPEZIUM, RIGHT HAND, REMOVAL:
- DEGENERATIVE JOINT DISEASE.
- MARROW SPACE WITH FIBROSIS AND SCATTERED LYMPHOCYTES AND PLASMA CELLS,
  COMPATIBLE WITH MILD CHRONIC OSTEOMYELITIS.
- NO MICROORGANISMS APPARENT WITH ROUTINE STAINS.
- NEGATIVE FOR MALIGNANCY.

Bone tumours

Main article: Bone tumours

This is a big topic. It is dealt with in a separate article.

The bone tumour article covers tumour mimics, e.g. brown cell tumour.

Fractures

Main article: Bone fractures

This is dealt with in the forensic pathology article.

Others

The following is a collection of stuff that doesn't really fit in another category or is just weird.

A general DDx for cystic bone lesions is found on radipedia.com.[12]

Sequestrum

Main article: Sequestrum

Osteoarthritis

Main article: Osteoarthritis

This keeps orthopaedic surgeons busy.

Aneurysmal bone cyst

Main article: Aneurysmal bone cyst

Myositis ossificans

  • AKA fibro-osseous pseudotumour of digits.[13]

General

Epidemiology:

  • Young people.
  • History of trauma - typically.
  • Extremities - digits (fingers, toes).

Notes:

  • Histologically "worrisome" (for malignancy) - due to high cellularity.[13]

Microscopic

Features:[13]

  • High cellularity.
  • Low mitotic activity.
  • No atypical mitoses.
  • No hyperchromasia.

Other features:[14]

  • Low power diagnosis:
    • Lesion is well-circumscribed.
    • Normal muscle is adjacent to the lesion - key feature.

DDx:

Images:

Paget disease of the bone

Main article: Paget's disease of the bone

Fibrous dysplasia

  • AKA osteitis fibrosa.
Main article: Fibrous dysplasia

Desmoplastic fibroma

General

  • Rare.

Microscopic

Features:[15]

  • Lamellar bone.
  • Fibrotic marrow space with:
    • Collagen.
    • Low cellularity.
    • Spindle cells without significant atypia.

DDx:

Gaucher disease

Main article: Gaucher disease

General

  • May present as a fracture.

Microscopic

  • Macrophages in the marrow space with a "crumpled tissue paper" appearance.

Langerhans cell histiocytosis of bone

  • AKA eosinophilic granuloma of bone.
Main article: Langerhans cell histiocytosis

General

  • Rare.
  • Children.

Microscopic

Features:

  • Eosinophils.
  • Cerebriform and/or reniform macrophages.

Giant cell reparative granuloma

General

  • Lesion of the mandible and maxilla.[16]

Radiology

  • Lytic lesion.

Microscopic

Features:[16]

  • Giant cells.
  • Fibroblasts.
  • Osteoid.
  • Hemosiderin-laden macrophages.

DDx:

Images

  • CGCG - intermed. mag. (WC/Nephron)

  • CGCG - high mag. (WC/Nephron)

Molecular

Recurrent chromosomal translocation:[17]

  • t(16;17)(q22;p13).

Osteopetrosis

General

  • Rare.
  • Genetic - may be autosomal dominant, autosomal recessive or X-linked.[18]
  • Pancytopenias - due to oblieration of the marrow space.
  • Fractures.
  • Radiologic diagnosis.

Gross

Image:

Microscopic

Features:[20]

  • Abundant irregular (pink) bony trabeculae with layers of (blue-gray) cartilage.

Image:

Osteoporosis

General

  • Very common.
  • Associated with fractures, esp. wrist, hip & vertebra.[21]
  • Radiologic diagnosis - bone mineral density.

Etiology:[22]

Gross

  • Decreased numbers of, abnormally thin, bony spicules.

Images:

Microscopic

Features (femoral neck):[24]

  • Thinner cortex.
  • Decreased trabecular thickness
  • Decreased number of trabeculae.

Note:

  • One study looking at iliac bone biopsies suggests trabeculae are no different in osteoporosis.[25]

See also

References

  1. ↑ Lin DD, Gailloud P, McCarthy EF, Comi AM (February 2006). "Oromaxillofacial osseous abnormality in Sturge-Weber syndrome: case report and review of the literature". AJNR Am J Neuroradiol 27 (2): 274–7. PMID 16484391.
  2. ↑ URL: http://www.life.umd.edu/classroom/bsci423/song/Lab1.html. Accessed on: 28 March 2012.
  3. ↑ Rudzki, Z.; Partyła, T.; Okoń, K.; Stachura, J. (2005). "Adequacy of trephine bone marrow biopsies: the doctor and the patient make a difference.". Pol J Pathol 56 (4): 187-95. PMID 16477878.
  4. ↑ URL: http://emedicine.medscape.com/article/199003-overview. Accessed on: 28 March 2012.
  5. ↑ IAV. 26 Feb 2009.
  6. ↑ http://upload.wikimedia.org/wikipedia/commons/6/69/Hematopoiesis_%28human%29_diagram.png
  7. ↑ http://emedicine.medscape.com/article/199003-overview
  8. ↑ Iancu, D.; Hao, S.; Lin, P.; Anderson, SK.; Jorgensen, JL.; McLaughlin, P.; Medeiros, LJ. (Feb 2007). "Follicular lymphoma in staging bone marrow specimens: correlation of histologic findings with the results of flow cytometry immunophenotypic analysis.". Arch Pathol Lab Med 131 (2): 282-7. doi:10.1043/1543-2165(2007)131[282:FLISBM]2.0.CO;2. PMID 17284114.
  9. ↑ URL: http://radiopaedia.org/articles/hyperostosis_frontalis_interna. Accessed on: 29 September 2010.
  10. ↑ 10.0 10.1 Hatzenbuehler, J.; Pulling, TJ. (Nov 2011). "Diagnosis and management of osteomyelitis.". Am Fam Physician 84 (9): 1027-33. PMID 22046943.
  11. ↑ Alabi, ZO.; Ojo, OS.; Odesanmi, WO. (1991). "Secondary amyloidosis in chronic osteomyelitis.". Int Orthop 15 (1): 21-2. PMID 2071276.
  12. ↑ URL: http://radipedia.com/WikiMedia/index.php?title=Benign_cystic_bone_lesions. Accessed on: 15 March 2011.
  13. ↑ 13.0 13.1 13.2 Humphrey, Peter A; Dehner, Louis P; Pfeifer, John D (2008). The Washington Manual of Surgical Pathology (1st ed.). Lippincott Williams & Wilkins. pp. 607. ISBN 978-0781765275.
  14. ↑ IAV. 9 December 2010.
  15. ↑ URL: http://www.bonetumor.org/tumors-fibrous-tissue/desmoplastic-fibroma. Accessed on: 14 April 2011.
  16. ↑ 16.0 16.1 16.2 Shah UA, Shah AK, Kumar S. Giant cell reparative granuloma of the jaw: A case report. Indian J Radiol Imaging [serial online] 2006 [cited 2012 Feb 28];16:677-8. Available from: http://www.ijri.org/text.asp?2006/16/4/677/32297.
  17. ↑ 17.0 17.1 Pan, Z.; Sanger, WG.; Bridge, JA.; Hunter, WJ.; Siegal, GP.; Wei, S. (Jan 2012). "A novel t(6;13)(q15;q34) translocation in a giant cell reparative granuloma (solid aneurysmal bone cyst).". Hum Pathol. doi:10.1016/j.humpath.2011.10.003. PMID 22285042.
  18. ↑ 18.0 18.1 Stark, Z.; Savarirayan, R. (2009). "Osteopetrosis.". Orphanet J Rare Dis 4: 5. doi:10.1186/1750-1172-4-5. PMC 2654865. PMID 19232111. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2654865/.
  19. ↑ Rose, Alan G. (2008). Atlas of Gross Pathology with Histologic Correlation (1st ed.). Cambridge University Press. pp. 469. ISBN 978-0521868792.
  20. ↑ 20.0 20.1 McMahon, C.; Will, A.; Hu, P.; Shah, GN.; Sly, WS.; Smith, OP. (Apr 2001). "Bone marrow transplantation corrects osteopetrosis in the carbonic anhydrase II deficiency syndrome.". Blood 97 (7): 1947-50. PMID 11264157.
  21. ↑ Lix, LM.; Azimaee, M.; Acan Osman, B.; Caetano, P.; Morin, S.; Metge, C.; Goltzman, D.; Kreiger, N. et al. (Apr 2012). "Osteoporosis-related fracture case definitions for population-based administrative data.". BMC Public Health 12 (1): 301. doi:10.1186/1471-2458-12-301. PMID 22537071.
  22. ↑ Mitchell, Richard; Kumar, Vinay; Fausto, Nelson; Abbas, Abul K.; Aster, Jon (2011). Pocket Companion to Robbins & Cotran Pathologic Basis of Disease (8th ed.). Elsevier Saunders. pp. 617. ISBN 978-1416054542.
  23. ↑ Dalle Carbonare, L.; Bertoldo, F.; Valenti, MT.; Zenari, S.; Zanatta, M.; Sella, S.; Giannini, S.; Cascio, VL. (2005). "Histomorphometric analysis of glucocorticoid-induced osteoporosis.". Micron 36 (7-8): 645-52. doi:10.1016/j.micron.2005.07.009. PMID 16243531.
  24. ↑ Blain, H.; Chavassieux, P.; Portero-Muzy, N.; Bonnel, F.; Canovas, F.; Chammas, M.; Maury, P.; Delmas, PD. (Nov 2008). "Cortical and trabecular bone distribution in the femoral neck in osteoporosis and osteoarthritis.". Bone 43 (5): 862-8. doi:10.1016/j.bone.2008.07.236. PMID 18708176.
  25. ↑ Chappard, D.; Alexandre, C.; Riffat, G. (1988). "Spatial distribution of trabeculae in iliac bone from 145 osteoporotic females.". Acta Anat (Basel) 132 (2): 137-42. PMID 3414359.

External links

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