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Intestinal Choristoma in the Subcutis of a Dog

Abstract

A 2-year-old, spayed female, Labrador Retriever-cross presented with a subcutaneous mass of several weeks' duration in the right flank region. Surgical excision and histologic examination were performed. The 1.0-cm-diameter mass was circumscribed, unencapsulated, and cystic with a bilayer wall. The inner layer resembled intestinal mucosa, including a tall columnar lining epithelium, crypt-like glands containing scattered neuroendocrine cells that were strongly immunopositive for synaptophysin, and a supporting lamina propria-like fibrovascular tissue that contained lymphocytes and plasma cells. The outer layer was 1- to 2-mm thick and was composed of intersecting and blending bundles of smooth muscle and collagen. Given the presence of organized intestinal tissues in the subcutis, the lesion was consistent with intestinal choristoma.

Key words: Choristoma; dogs; immunohistochemistry; intestine; subcutis.

Request reprints from Dr K A Whitten, Department of Veterinary Pathology, Armed Forces Institute of Pathology, 14th Street& Alaska Avenue NW, Washington, DC 20306-6000 (USA). E-mail: kim.whitten{at}us.army.mil