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===Bone cysts===
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===[[Bone Cysts]]===
[[Image:Bone cysts dog.jpg|right|thumb|100px|<small><center>Bone cysts (Image sourced from Bristol Biomed Image Archive with permission)</center></small>]]
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*May be seen radiographically
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*Must be distinguished from [[Bones Hyperplastic and Neoplastic - Pathology#Neoplastic|neoplasia]]
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*Expansile lytic masses
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*Do not appear aggressive
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*'''Subchondral cysts'''
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**Common in horses and pigs
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**Usually manifestations of [[Joints Developmental - Pathology#Osteochondrosis|osteochondrosis]] and [[Joints Degenerative - Pathology#Degenerative joint disease (DJD)|DJD]]
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*'''Simple cysts'''
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**May contain clear colourless fluid, or serosanguinous
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**Wall of dense fibrous tissue, [[Bones - Anatomy & Physiology|woven or lamellar bone]]
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*'''Aneurysmal bone cysts'''
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**Expansie lesions
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**Arise from disturbance of vascular tissue of bone marrow
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**Grossly:
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***Appear as blood filled sponge
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***Spaces separated by fibrous trabeculae
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**Histologically:
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***Proliferation of undifferentiated mesenchymal cell with multinucleated osteoclast-like cells
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***Haemorrhage and haemosiderosis
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*Radiography is essential to help differentiate with cavity of a neoplasm
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[[Category:Bones - Degenerative Pathology]]
   
===Calcium hydroxylapatite deposition disease===
 
===Calcium hydroxylapatite deposition disease===
  
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