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Vet Pathol 41:273-274 (2004)
© 2004 American College of Veterinary Pathologists
BRIEF COMMUNICATIONS AND CASE REPORTS

Multifocal Rhabdomyosarcomas Within the Tongue and Oral Cavity of a Dog

C. W. Brockus and R. K. Myers

Abstract

A 10-year-old terrier crossbreed presented with a change in bark intonation of 3–4 month's duration and pronounced panting. Four variably sized masses were observed within the oral cavity. The largest mass was located within the parenchyma at the caudal region of the tongue. Others were located on the left arytenoid, within the soft palate, and in the oropharynx above the soft palate. Histopathologic specimens consisted of large round to polygonal cells occasionally containing multiple nuclei and rare faint cytoplasmic cross striations. Staining was weakly positive with periodic acid–Schiff. Immunocytochemistry was strongly diffusely positive for muscle-specific actin, myoglobin, and desmin and scattered positive for S-100 and vimentin. Phosphotungstic acid–hematoxylin staining enhanced cytoplasmic cross striations. The cytoplasm of all neoplastic cells was filled with mitochondria on electron microscopy. The final diagnosis was multifocal/metastatic rhabdomyosarcoma.

Key words: Dogs; multifocal rhabdomyosarcoma; nasopharynx; oral cavity; tongue.

Request reprints from Dr. C. W. Brockus, Department of Veterinary Pathology, College of Veterinary Medicine, Iowa State University, Ames, IA 50011-1250 (USA). cbrockus{at}iastate.edu.




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