Vertebral Angiosarcoma in a Horse

Abstract

From the Animal Health Diagnostic Laboratory (Kennedy) and Department of Large Animal Clinical Sciences (Brown), College of Veterinary Medicine, Michigan State University, East Lansing, MI 48824-1316. Received for publication October 23, 1991. or angiosarcomas. This is a report of a case of vertebral angiosarcoma in a horse. An 18-year-old Quarter Horse gelding had difficulty lifting his head. Over a 2-week period, the condition progressed to ataxia and recumbency. A myelogram revealed a space-occupying lesion impinging on the spinal cord at the level of the fourth cervical vertebra (C4). The horse was euthanized, and a necropsy was performed. A 3.4x 0.5x 0.5-cm dark red and yellow mottled soft mass was free in the extradural space, ventral to the spinal cord, and within the vertebral canal of C4 (Fig. 1). In a longitudinal section of C4, the periosteum of the ventral vertebral