Abstract
A case of granulomatous enteritis in a three-year-old thoroughbred horse is described. Onset of clinical signs succeeded pyrexia of unknown aetiology. The horse was emaciated, depressed and inappetent but diarrhoea was not a feature of the condition. There was hypoproteinaemia, anaemia, leucopaenia and abnormal small-intestinal carbohydrate absorption. Rectal biopsy revealed granulomatous changes in the rectal mucosa. As a result of these findings, euthanasia was performed and an autopsy was carried out. Histopathology showed marked villous atrophy in the small intestine with a diffuse mononuclear cellular infiltration involving mainly the submucosa and lamina propria. There were occasional granulomatous foci. The mononuclear cells consisted mainly of lymphocytes and histiocytes. No aetiological agent was isolated.
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