Intraspinal synovial cyst in a dog

An eight-year-old, male Siberian husky cross was referred with a history of an acute onset of pelvic-limb ataxia and paraparesis. Radiography and subs equent myelography of the spine revealed an extradural compression of the s pinal cord at the level of the 13th thoracic (T-13) to first lumbar (L-1) v ertebrae, Hemilaminectomy resulted in the successful removal of an extradur al cystic lesion. The morphological diagnosis based on histopathology was a synovial cyst with chondromatosis. There were no postoperative complicatio ns, and the dog's condition improved markedly. At two years postoperatively , the animal remains normal on both physical and neurological examination. To the authors' knowledge, this article is the first report of an intraspin al synovial cyst in a dog.