Visceral mast cell tumors in dogs: 10 cases (1982-1997)

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Abstract

Objective - To characterize the clinical features of visceral mast cell tumors (MCT) without associated cutaneous involvement in dogs. Design - Retrospective study. Animals - 10 dogs with histologically confirmed MCT without associated cutaneous lesions. Procedure - Information on signalment, clinical signs, laboratory examinations, and time from first admission to death was obtained from the medical record of each dog. Results - Purebred male dogs of miniature breeds appeared to have a higher prevalence of visceral MCT. Clinical signs included anorexia, lethargy, vomiting, and diarrhea. Anemia (n = 7), hypoproteinemia (5), and mastocythemia (5) were detected. Treatments, including glucocorticoids, were not successful. Primary sites of tumors were the gastro intestinal tract (n = 6) and the spleen or liver (1); the primary site was not confirmed in the remaining 3 dogs. In 7 dogs, tumors were categorized as grade II or III, on the basis of histologic findings. The prognoses were poor, and all dogs died within 2 months after first admission. Conclusions and Clinical Relevance - Visceral MCT is uncommon in dogs, and the prognosis is extremely poor. Biological behavior and drug susceptibility of visceral MCT may be different from cutaneous MCT. The lack of specific clinical signs may result in delay of a definitive diagnosis. The rapid progression of clinical signs and difficulty in diagnosis contributes to a short survival time.

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Takahashi, T., Kadosawa, T., Nagase, M., Matsunaga, S., Mochizuki, M., Nishimura, R., & Sasaki, N. (2000). Visceral mast cell tumors in dogs: 10 cases (1982-1997). Journal of the American Veterinary Medical Association, 216(2), 222–226. https://doi.org/10.2460/javma.2000.216.222

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