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