Primary omentum extraskeletal osteosarcoma in a dog: case report.

A rescued male mixed-breed dog, approximately nine years old, was evaluated due to progressive weight loss and an enlarged abdomen. An ultrasound revealed a large, indeterminate mass with mineral-like margins visible on the radiographs. The animal underwent an exploratory laparotomy, and the mass was excised. Histopathological analysis revealed characteristics consistent with a primary omentum extraskeletal osteosarcoma. This rare neoplasm, originating from mesenchymal cell proliferation and bone matrix production, is highly malignant. It often results in death due to metastasis and local recurrence or necessitates euthanasia post-diagnosis in certain cases.

Um canino macho de aproximadamente 9 anos de idade, sem raça definida, foi recebido para atendimento apresentando sinais de emagrecimento progressivo e aumento de volume abdominal. Um exame ultrassonográfico revelou uma formação de grandes dimensões e de origem indeterminada, apresentando característica de mineralização periférica pela radiografia. Foi realizada laparotomia exploratória com remoção da formação. A análise histopatológica revelou características compatíveis com osteossarcoma primário de omento, uma neoplasia rara originada da proliferação de células mesenquimais com produção de matriz óssea, com alto grau de malignidade, geralmente levando à óbito devido a metástases e recorrência local do tumor ou eutanásia após o diagnóstico em alguns casos.

Osteossarcoma mamário com êmbolo neoplásico em cerebelo / Mammary osteosarcoma with neoplastic emboli in cerebellum

Background: The mammary neoplasms are highly frequent in female dogs. It is characterized by the proliferation of epithelial or mesenchymal cells. The mammary osteosarcoma is a example of the proliferation of the last group and its main feature is production of osteoid matrix and areas of mature bone tissue formation. Metastases to the lungs and regional lymph nodes are frequent, however some other metastasis sites have been reported. The aim of this study is to report a mammary osteosarcoma in a 12-year-old mixed-breed female dog with multiple metastases and neoplastic emboli to the central nervous system. Case: The animal was brought to the Veterinary Hospital of the Uberlândia Federal University (HV/UFU) with the complaint of increase in the volume of the mammary glands. The cytopathological exams was performed in the mass that measured 15 cm of diameter and covering a large region of the mammary gland, from the right cranial thoracic to the right cranial abdominal mammary gland. The cytological diagnostic was inconclusive because of the lack of material for diagnosis. Therefore, total unilateral mastectomy was performed for histopathology analysis. The material was then sent to the Animal Pathology Laboratory of the HV/UFU where routine processing was performed. The microscopy showed proliferation of mesenchymal cells arranged in bundles with intense pleomorfism and producing osteoid matrix, leading to the diagnosis of mammary osteosarcoma. Around 15 days after the diagnostic the animal died and was sent the Animal Pathology Laboratory of the HV/UFU for necropsy. During the external exam there was a mass at the same site of the primary mass previously extracted. Besides it, there were masses affecting lungs, intestine and kidneys. The histopathological exam showed sites of metastasis of osteosarcoma in the organs described, as well as neoplastic...(AU)

Osteossarcoma mamário com êmbolo neoplásico em cerebelo / Mammary osteosarcoma with neoplastic emboli in cerebellum

Background: The mammary neoplasms are highly frequent in female dogs. It is characterized by the proliferation of epithelial or mesenchymal cells. The mammary osteosarcoma is a example of the proliferation of the last group and its main feature is production of osteoid matrix and areas of mature bone tissue formation. Metastases to the lungs and regional lymph nodes are frequent, however some other metastasis sites have been reported. The aim of this study is to report a mammary osteosarcoma in a 12-year-old mixed-breed female dog with multiple metastases and neoplastic emboli to the central nervous system. Case: The animal was brought to the Veterinary Hospital of the Uberlândia Federal University (HV/UFU) with the complaint of increase in the volume of the mammary glands. The cytopathological exams was performed in the mass that measured 15 cm of diameter and covering a large region of the mammary gland, from the right cranial thoracic to the right cranial abdominal mammary gland. The cytological diagnostic was inconclusive because of the lack of material for diagnosis. Therefore, total unilateral mastectomy was performed for histopathology analysis. The material was then sent to the Animal Pathology Laboratory of the HV/UFU where routine processing was performed. The microscopy showed proliferation of mesenchymal cells arranged in bundles with intense pleomorfism and producing osteoid matrix, leading to the diagnosis of mammary osteosarcoma. Around 15 days after the diagnostic the animal died and was sent the Animal Pathology Laboratory of the HV/UFU for necropsy. During the external exam there was a mass at the same site of the primary mass previously extracted. Besides it, there were masses affecting lungs, intestine and kidneys. The histopathological exam showed sites of metastasis of osteosarcoma in the organs described, as well as neoplastic...

Osteossarcoma osteoblástico primário em glândula tireoide de cão da raça rotweiller - relato de caso / Primary osteoblastic osteosarcoma in the thyroid gland of a rottweiler - a case report / Osteosarcoma osteoblástico primario de tiroides en Rottweiler - relato de caso

Osteossarcoma extraesquelético em cães é um tipo raro de câncer ósseo,com capacidade de acometer outros órgãos e tecidos epiteliais. Este estudotem como objetivo relatar o caso de um cão macho da raça rotweiller comosteossarcoma extraesquelético em glândula tireoide e evolução de três meses, desde a sua manifestação clínica. Durante a consulta , foi realizada radiografia do pescoço para avaliar a extensão do tumor. Foram feitas também radiografia do tóraxe ultrassonografia abdominal, sendo ambas negativas para metástase. O material do tumor foi colhido por citologia aspirativa, sendo sugestivo para osteossarcoma. Após 25 dias, o paciente foi submetido ao procedimento cirúrgico para tireoidectomia total; no entanto, veio a óbito após o término da cirurgia, devido a complicaçõescardio/respiratórias. Foi realizada a necropsia, sendo constatada a presença de nódulos na pleura e no pulmão compatíveis com metástase. O diagnóstico foi confirmado posteriormente por meio do exame histopatológico, o que caracterizou um quadro raro de câncer em cães.(AU)

Extraskeletal osteosarcoma is a rare type of bone cancer in dogs, and canaffect other organs and epithelial tissues. This study reports the case of a male rottweiler presenting a three-month history of extraskeletal osteosarcoma in the thyroid gland. Neck radiography was performed to assess tumor extension, as well as chest and abdominal ultrasonography, which were negative for metastasls . Aspirationcytology of tumor material was suggestive of osteosarcoma. After 25 days, the patient underwent total thyroidectomy, but passed away after surgery completion due to cardiorespiratory complications. Necropsy confirmed the presence of nodules in the pleura and lung that were consistent with metastasis. Histopatholoqical examinationlater confirmed the diagnosis of a rare case of cancer in dogs.(AU)

El osteosarcoma extraesquelético del perro es un tipo raro de cânceróseo, que puede afectar otros órganos y tejidos epiteliates. Este trabajo tiene como objetivo relatar el caso de un perro macho de raza Rottweiler que presento un osteosarcoma extraesquelético en la glándula tiroides con evolución de tres mesesdesde su manifestación clínica. Durante la consulta se realizó una radiografia delcuello a fin de evaluar la extensión del tumor. Se realizaron también radiografías de tórax y ecografía abdominal, aunque ambos exámenes fueron negativos en relacióna la presencia de metástasis. Se realizó una punción aspirativa, y el material enviado para examen fue sugestivo de osteosarcoma. Veinticinco días después el paciente entró en cirugía, en la que se realizó una tiroidectomía total. No obstante, el mismo murió después del procedimiento quirúrgico debido a complicaciones cardiorrespiratorias.En la necropsia se pudo comprobar la presenda de nódulos en la pleura y en el pulmón compatibles con metástasis. El diagnóstico se comprobó por exámenes histopatológicos, confirmando la presencia de un cuadro raro de cáncer en perros.(AU)

Osteossarcoma osteoblástico primário em glândula tireoide de cão da raça rotweiller - relato de caso / Primary osteoblastic osteosarcoma in the thyroid gland of a rottweiler - a case report / Osteosarcoma osteoblástico primario de tiroides en Rottweiler - relato de caso

Osteossarcoma extraesquelético em cães é um tipo raro de câncer ósseo,com capacidade de acometer outros órgãos e tecidos epiteliais. Este estudotem como objetivo relatar o caso de um cão macho da raça rotweiller comosteossarcoma extraesquelético em glândula tireoide e evolução de três meses, desde a sua manifestação clínica. Durante a consulta , foi realizada radiografia do pescoço para avaliar a extensão do tumor. Foram feitas também radiografia do tóraxe ultrassonografia abdominal, sendo ambas negativas para metástase. O material do tumor foi colhido por citologia aspirativa, sendo sugestivo para osteossarcoma. Após 25 dias, o paciente foi submetido ao procedimento cirúrgico para tireoidectomia total; no entanto, veio a óbito após o término da cirurgia, devido a complicaçõescardio/respiratórias. Foi realizada a necropsia, sendo constatada a presença de nódulos na pleura e no pulmão compatíveis com metástase. O diagnóstico foi confirmado posteriormente por meio do exame histopatológico, o que caracterizou um quadro raro de câncer em cães.

Extraskeletal osteosarcoma is a rare type of bone cancer in dogs, and canaffect other organs and epithelial tissues. This study reports the case of a male rottweiler presenting a three-month history of extraskeletal osteosarcoma in the thyroid gland. Neck radiography was performed to assess tumor extension, as well as chest and abdominal ultrasonography, which were negative for metastasls . Aspirationcytology of tumor material was suggestive of osteosarcoma. After 25 days, the patient underwent total thyroidectomy, but passed away after surgery completion due to cardiorespiratory complications. Necropsy confirmed the presence of nodules in the pleura and lung that were consistent with metastasis. Histopatholoqical examinationlater confirmed the diagnosis of a rare case of cancer in dogs.

El osteosarcoma extraesquelético del perro es un tipo raro de cânceróseo, que puede afectar otros órganos y tejidos epiteliates. Este trabajo tiene como objetivo relatar el caso de un perro macho de raza Rottweiler que presento un osteosarcoma extraesquelético en la glándula tiroides con evolución de tres mesesdesde su manifestación clínica. Durante la consulta se realizó una radiografia delcuello a fin de evaluar la extensión del tumor. Se realizaron también radiografías de tórax y ecografía abdominal, aunque ambos exámenes fueron negativos en relacióna la presencia de metástasis. Se realizó una punción aspirativa, y el material enviado para examen fue sugestivo de osteosarcoma. Veinticinco días después el paciente entró en cirugía, en la que se realizó una tiroidectomía total. No obstante, el mismo murió después del procedimiento quirúrgico debido a complicaciones cardiorrespiratorias.En la necropsia se pudo comprobar la presenda de nódulos en la pleura y en el pulmón compatibles con metástasis. El diagnóstico se comprobó por exámenes histopatológicos, confirmando la presencia de un cuadro raro de cáncer en perros.