RESUMO
Thymomas and mediastinal lymphomas are the most common mediastinal neoplasms in cats. While mediastinal lymphoma occurs primarily in younger cats (approximately 2 to 4 years of age), thymomas are diagnosed almost exclusively in older cats. However, the following case shows that this is not necessarily always the case.A 3-year- and 11-month-old neutered male European Shorthair was presented with a preliminary report of exercise intolerance and restricted respiration. Both symptoms occurred primarily at high ambient temperatures. Radiographically, a mediastinal mass filled a significant part of the thoracic cavity. A computed tomographic examination and ultrasound-guided TruCut biopsy were performed. Histologic examination suggested a thymoma. A sternal thoracotomy and resection of the circumferential proliferation was conducted. Subsequent histopathologic examination confirmed the suspected diagnosis of a mediastinal thymoma. The cat recovered well postoperatively, and a clinical and radiographic follow-up examination was unremarkable after 8 months.
Assuntos
Doenças do Gato , Timoma , Neoplasias do Timo , Gatos , Animais , Masculino , Doenças do Gato/cirurgia , Doenças do Gato/diagnóstico , Doenças do Gato/patologia , Doenças do Gato/diagnóstico por imagem , Timoma/veterinária , Timoma/cirurgia , Timoma/diagnóstico , Timoma/patologia , Neoplasias do Timo/veterinária , Neoplasias do Timo/cirurgia , Neoplasias do Timo/diagnóstico , Neoplasias do Timo/patologia , Neoplasias do Mediastino/veterinária , Neoplasias do Mediastino/cirurgia , Neoplasias do Mediastino/diagnóstico , Neoplasias do Mediastino/patologia , Tomografia Computadorizada por Raios X/veterináriaRESUMO
Este reporte describe los hallazgos macro y microscópicos de un mesotelioma invasivo epitelial y mesotelioma bifásico (mixto) maligno en un canino macho de 8 años de edad, raza Pit Bull, que llegó a la Clínica Veterinaria de la Escuela de Medicina Veterinaria y Zootecnia de la Facultad de Ciencias Agropecuarias y Recursos Naturales de la Universidad de los Llanos, cuyo motivo de consulta fue aumento del tamaño del abdomen, ascitis, anorexia, pérdida de peso, depresión, dificultad respiratoria y vómito. Según lo reportado por el propietario, el animal había recibido tratamiento para una falla renal que venía presentando meses atrás. Por el pobre pronóstico y orden del propietario, el animal fue eutanasiado y se remitió para necropsia al Laboratorio de Histopatología Veterinaria de la Universidad, siendo realizada la examinación post mortem. A la necropsia, se halló un tumor que comprometió el pericardio con dos neoplasias ulceradas, el mediastino y peritoneo, con numerosas multifocales o, a menudo, confluentes masas neoplásicas blanquecinas, las cuales estaban esparcidas a través del omento y superficies serosas de los órganos de la cavidad abdominal, como en el riñón derecho, páncreas e igualmente dos masas bilobuladas de color rojo de 1 x 1,5 cm en el tejido subcutáneo de la región inguinal, por extensión directa a través del peritoneo, implantación e invasión del tejido subyacente. Por histopatología, se diagnosticó un mesotelioma invasivo epitelial y mesotelioma bifásico maligno, con metástasis a riñón y páncreas, en los que se encontraron células mesoteliales neoplásicas con figuras mitóticas frecuentes, binucleación e invasión de tejidos submesoteliales infiltrados. En hemograma realizado previo a la necropsia, se encontró en el frotis sanguíneo, células blásticas y núcleos desnudos, hallazgos compatibles con una leucemia mielomonocítica.
This report describes the gross, microscopic features of an invasive epithelioid malignant mesothelioma and biphasic (mixed) malignant mesothelioma in an 8 ¡year ¡old male Pit ¡Bull, arrives to the Veterinary Clinic of the School of Veterinary Medicine and Zootecnia of the Faculty of Agricultural Sciences and Natural Resources of the Universidad de los Llanos, whose consultation reason was a increased of the size of abdomen, ascites, anorexia, weight lost, depression, breathing difficulty, vomit, according to the report of the owner, the animal had received treatment for the renal fail which occurred some months ago. The tumor involved the pericardium with two ulceratived neoplastic masses, pleura, mediastinum, and peritoneum with numerous, multiple foci, white neoplastic masses scattered through the peritoneum, and serous surfaces of the organs of the abdominal cavity as the right kidney, pancreas, and equality two bilobed masses with red color of 1 X 1,5cm in the subcutaneous tissue of the inguinal region by direct invaded through the peritoneum, implantation and direct invasion of the subjacent tissue. By histopathology was diagnosed a invasive epithelioid malignant mesothelioma and biphasic (mixed) malignant mesothelioma, with metastasis to kidney and pancreas, the neoplastic cells with frequent mitotic figures and binucleation that infiltrated submesothelial tissues. In the hemogram realized before the necropsy, we found blastic blood cell frotis and naked shared gross with a mielomonocitic leukaemya.