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Vet Pathol 44:240-243 (2007)
© 2007 American College of Veterinary Pathologists
BRIEF COMMUNICATIONS AND CASE REPORTS

Synovial Hemangioma in the Stifle Joint of a Dog

M. A. Miller, R. R. Pool and B. R. Coolman

Animal Disease Diagnostic Laboratory and Department of Veterinary Pathobiology, Purdue University, West Lafayette, IN (MAM); Department of Veterinary Pathobiology, Texas A & M University, College Station, TX (RRP); and Northeast Indiana Veterinary Emergency Specialty Hospital, Fort Wayne, IN (BRC)

Abstract

Synovial hemangioma was diagnosed in an 8-year-old castrated male Belgian Sheepdog with lameness of 3 months' duration. Pain, soft-tissue swelling, and hemarthrosis were localized to the left stifle joint. Projections of synovial membrane with reddish-purple nodules, excised via arthrotomy, were composed histologically of variably sized vascular channels that were lined by well-differentiated endothelial cells and separated by fibrous septa. Distension of some channels resulted in endothelial disruption, thrombosis, hemorrhage, necrosis, and focal spindle-cell proliferation. The limb was amputated to remove remaining neoplastic tissue. The hemangioma extended focally into the joint capsule and popliteal soft tissue but did not invade skeletal muscle or bone. The dog was free of detectable neoplasia 6 months after amputation. Synovial hemangioma is a rare benign vascular proliferation in people, most commonly in the knee, and should be included in the differential diagnosis for canine synovial tumors.

Key words: Dogs; hemarthrosis; lameness; synovial hemangioma.

Request reprints from Dr. Margaret A. Miller, Purdue University, Animal Disease Diagnostic Laboratory, 406 S. University St., West Lafayette, IN 47907 (USA). E-mail: pegmiller{at}purdue.edu






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