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.
Titulo en ingles: Consumption of oxygen by white cachama (Piaractus brachypomus) during different stages of corporal development.RESUMEN: Con el objetivo de evaluar el consumo de oxígeno en cachama blanca (Piaractus brachypomus) durante diferentes etapas de desarrollo, ejemplares de 10, 50, 100, 200, 300 y 500 g de peso corporal, previo periodo de acostumbramiento de 30 min., se alojaron en un respirómetro cerrado de 172 L durante un periodo de dos a cuatro horas, manteniendo la temperatura del agua constante a 28°C. La concentración de oxígeno en el agua del respirómetro fue medida a intervalos de 5 min. durante dos horas mediante un oxímetro digital. Se determinó que el consumo de oxígeno por kg en esta especie está relacionado inversamente con el peso corporal y que animales con pesos corporales superiores a 50 g consumen menor cantidad de oxígeno por unidad de peso que animales de pesos inferiores. El consumo de oxígeno a esta temperatura podría expresarse mediante la siguiente ecuación de regresión: Y = 803.3 – 107.2 Ln (X), donde Y = consumo de oxígeno y Ln(X) = logaritmo natural del peso corporal expresado en kg.Palabras clave: cachama blanca, consumo de oxígeno, peso corporal, respirómetro.ABSTRACT: With the purpose of evaluating oxygen consumption of the cachama blanca (Piaractus brachypomus) during different stages of growth, after initial acclimatation during 30 min; fish with body weights of 10, 50, 100, 200, 300 and 500 g were placed in a closed respirometer of 172 liters, and the water temperature was maintained at (28°C) during 2 to 4 hours. The oxygen concentration in the water of the respirometer was measured every five min using a digital oxymeter. In this species, an inverse relationship between oxygen consumption per kg and corporal weight was observed; fish with body weight greater than 50 g consumed less oxygen than smaller fish. At 28°C, the oxygen consumption could be calculated using the following regression equation: Y = 803.3 – 107.2 Ln (X), where Y = oxygen consumption, and Ln (X) = natural logarithm of body weight expressed in kg.Keywords: cachama Blanca, oxygen consumption, body weight, respirometer.
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