ABSTRACT
Three different types of bone cysts have been reported in dogs: subchondral, uni - cameral and aneurysmal. Subchondral cysts are believed to be a manifestation of osteo - chon drosis and are formed as a result of invagination of synovial membrane. Uni - cameral or simple bone cysts occur in young, large-breed dogs and are located in the meta physeal area of long bones. Radiographically, the lesions are lytic and expansile. The cysts may be divided by a fibro-osseous septum and usually contain a strawcolored fluid or fibrous tissue. Aneurysmal bone cysts are expansive osteolytic lesions that develop secondary to hemodynamic alterations of the bone marrow. Benign and malig nant neoplasia, fibrous dysplasia, unicameral bone cyst and trauma have been pro posed as being inciting factors for aneurysmal bone cyst formation. iv. Treatment options include curettage with or without cancellous bone grafting, cryo - therapy, complete excision, irradiation or amputation. The latter was performed in this dog.
