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Vet Pathol 38:223-226 (2001)
© 2001 American College of Veterinary Pathologists
BRIEF COMMUNICATIONS AND CASE REPORTS

Small Intestine Large Granular Lymphoma in a Horse

P. Herraez, B. Berridge, P. Marsh, B. Weeks and F. Ramiro-Ibañez

Abstract

A 12-year-old Appaloosa gelding was referred to the Texas Veterinary Medical Center with a history of chronic diarrhea and weight loss. At necropsy, numerous oval, craterlike ulcers were observed throughout the small intestine. Histologically, these lesions were composed of a neoplastic proliferation of round cells with intracytoplasmic phosphotungstic acid–hematoxylin-positive granules. The tumor cells stained positively for the CD3 antigen and negatively for a B-cell marker. A diagnosis of large granular lymphoma was based on the morphologic and immunohistochemical characteristics of the neoplasm. The postmortem presentation of this case depicted unusual multifocal, ulcerative lymphomatous lesions throughout the small intestine without involvement of the regional lymph nodes. The histologic and ultrastructural morphology of the neoplastic lymphocytes was similar to that in previously reported cases of abdominal equine large granular lymphomas, but in this case the neoplasm was restricted to the small intestine.

Key words: Granular lymphoma; horses; natural killer cells; small intestine; T lymphocytes.

Request reprints from Dr. F. Ramiro-Ibañez, Department of Pathobiology, College of Veterinary Medicine, Texas A&M University, College Station, TX 77843 (USA).




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[Abstract] [Full Text] [PDF]


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