ABSTRACT. The present study describes macroscopic and microscopic findings in a canine English Bulldog , female, 6 years with sudden death and suspicious of poisoning. The animal was referred for post-mortem evaluation to the Pathology Sciences Department of Veterinary FacultyNational University of Asunción (UNA) . The necropsy revealed an unique irregular protuberance (4 x 2.5 cm) located at the heart base external to the aorta, invading adventicia and infiltrating left atrium myocardium with focal central necrosis. Histopathological examination showed polygonal, round and oval cells with granular cytoplasm, histologic characteristics of neoplastic chemoreceptor cells. Keywords RESUMEN.En el presente estudio se describen hallazgos macroscópicos y microscópicos de un quimiodectoma en un canino, Bulldog inglés, hembra, de 6 años con muerte súbita y diagnóstico presuntivo de envenenamiento. El cadáver del animal se remitió al Departamento de Ciencias Patológicas de la Facultad de Ciencias Veterinarias (FCV) -Universidad Nacional de Asunción (UNA) para el estudio post-mortem. La necropsia reveló una protuberancia única, irregular (4 x 2,5cm) localizada en la base del corazón, periférica a la aorta, invadiendo adventicia e infiltrando miocardio auricular izquierdo con necrosis focal central. Al examen histopatológico de la protuberancia se constató una población celular compuesta por células poligonales, redondeadas y ovales con citoplasma granular, características histológicas de células quimiorreceptoras neoplásicas.Palabras clave: quimiodectoma, cuerpo aórtico, canino, corazón.
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