• Journal of Veterinary Clinics
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• v.37 no.6
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• pp.336-338
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• 2020

A 12-year-old female spayed miniature schnauzer with one month history of halitosis had a cylindrical protruding mass about 2 × 2 × 1 cm in size arising from the right palatine tonsil. Histopathologically, tonsillar mass was covered with stratified squamous epithelium and many lymphoid follicles with germinal center were existed in the upper area of submucosa. Numerous variable sized, occasionally cystic dilated vascular channels (thin walled lymphatic channels) lined by flattened, discontinous endothelial cells were widely distributed throughout the core of fibrovascular stroma. According to immunohistochemistry (IHC), lining endothelial cells in vascular channels showed strong immunoreactivities for CD31 and von Willebrand factor. Based on the gross, histopathologic, and IHC findings, the oral mass of dog was diagnosed as tonsillar lymphangiomatous polyp, the second case in a veterinary field.