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Bones Degenerative - Pathology (view source)

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===~~Bone cysts===~~

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===[[Bone Cysts]]===

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[[~~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===

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