title: Synovial osteochondromatosis with malignant transformation to chondrosarcoma in a dog.
abstract: A 4.5-year-old intact male Labrador Retriever dog had a 1-month history of right forelimb lameness with painful swelling of the elbow. The radiographic findings of increased synovial mass with mineralized opacities and the gross and histologic findings in the synovial biopsy specimens were consistent with a diagnosis of primary (idiopathic) synovial osteochondromatosis. Twenty months after initial presentation, based on progression of clinical signs and radiographic evidence of marked bone lysis in the distal aspect of the humerus and proximal aspects of the radius and ulna, the affected leg was amputated. The histologic diagnosis was chondrosarcoma with fibroblastic differentiation and bone lysis. The chondrosarcoma was interpreted as malignant transformation of primary synovial osteochondromatosis.
authors.affiliation: Department of Veterinary Biosciences, College of Veterinary Medicine, The Ohio State University, 1925 Coffey Road, Columbus, OH 43210, USA. aeffner.1@osu.edu
authors.forename: F
authors.initials: F
authors.lastname: Aeffner
authors.forename: R
authors.initials: R
authors.lastname: Weeren
authors.forename: S
authors.initials: S
authors.lastname: Morrison
authors.forename: I N M
authors.initials: IN
authors.lastname: Grundmann
authors.forename: S E
authors.initials: SE
authors.lastname: Weisbrode
mesh_terms: D000671:Amputation, Surgical / Q000662:veterinary; D000818:Animals; D001859:Bone Neoplasms / Q000175:diagnosis / Q000473:pathology / Q000601:surgery / Q000662:veterinary*; D002471:Cell Transformation, Neoplastic; D015838:Chondromatosis, Synovial / Q000175:diagnosis / Q000473:pathology / Q000662:veterinary*; D002813:Chondrosarcoma / Q000175:diagnosis / Q000473:pathology / Q000601:surgery / Q000662:veterinary*; D003937:Diagnosis, Differential; D004283:Dog Diseases / Q000175:diagnosis / Q000473:pathology* / Q000601:surgery; D004285:Dogs; D005552:Forelimb / Q000601:surgery*; D008297:Male