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Vet Pathol 43:374-377 (2006)
© 2006 American College of Veterinary Pathologists
BRIEF COMMUNICATIONS AND CASE REPORTS

Carcinoma ex Pleomorphic Adenoma with Sebaceous Differentiation in the Mandibular Salivary Gland of a Dog

O. A. Smrkovski, A. K. LeBlanc, S. H. Smith, C. J. LeBlanc, W. H. Adams and K. M. Tobias

Abstract

A carcinoma ex pleomorphic adenoma was diagnosed in the left mandibular salivary gland of an 8-year-old female spayed dog. The animal presented with a large nonpainful swelling in the left submandibular region. A computed tomography scan detected an irregularly enhancing soft tissue mass that was closely associated with the left external ear canal and extended to the left wing of the atlas. On surgical exploration, the mass was intimately associated with the left mandibular salivary gland. Both the mass and the adjacent gland were removed, and the diagnosis was determined by histopathology. The tumor was comprised of basaloid and low columnar epithelial cells, many glandular units formed by well-differentiated sebocytes, and multifocal regions of necrosis, mineralization, and hemorrhage. Salivary gland tumors with sebaceous differentiation are very rare in animals, with one previously reported case in a cat.

Key words: Carcinoma; dogs; salivary gland; tumor.

Request reprints from A. LeBlanc, The University of Tennessee, College of Veterinary Medicine, Small Animal Clinical Sciences, C247 Veterinary Teaching Hospital, 2407 River Dr., Knoxville, TN 37996 (USA). E-mail: aleblanc{at}mail.ag.utk.edu






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Copyright © 2006 by the American College of Veterinary Pathologists.