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Vet Pathol 38:242-246 (2001)
© 2001 American College of Veterinary Pathologists
BRIEF COMMUNICATIONS AND CASE REPORTS

Gastrointestinal Stromal Tumors of the Equine Cecum

S. Hafner, B. G. Harmon and T. King

Abstract

Ten cecal tumors were identified during the postmortem examination of seven horse carcasses at slaughter (one horse had three tumors). The multinodular and hemorrhagic tumors ranged from 1 to 10 cm in diameter and consisted of spindle cells arranged in thin, interconnected trabeculae that were often separated by sinuses filled with mucinous fluid, erythrocytes, and siderophages. Spindle cells of all tumors were immunopositive for vimentin, neuron-specific enolase, and c-kit protein but lacked reactivity with antibodies to glial fibrillary acidic protein, S100 protein, and desmin. In one tumor, spindle cells diffusely bound antibodies to synaptophysin. Most tumors contained focal reactivity to smooth muscle actin antibodies; one tumor reacted diffusely. Ultrastructurally, tumor cells were connected by desmosome-like structures and exhibited extended cell processes; some contained dense core neurosecretory granules. These equine stromal tumors appeared to share some characteristics with human gastrointestinal stromal tumors.

Key words: Cecum; gastrointestinal stromal tumor; horses; immunohistochemistry; neoplasia.

Request reprints from Dr. Scott Hafner, Pathology Section, USDA FSIS, Eastern Laboratory, Russell Research Center, PO Box 6085, College Station Road, Athens, GA 30604 (USA). E-mail: scott.hafner{at}dchqexs1.hqnet.usda.gov.




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