Atypical chondroblastic osteosarcoma in the axial skeleton in a dog

作者：de Franca Silva Francine Maria; Fabretti Andrei Kelliton; da Silva Elisangela Olegario; Lima da Silva Vanessa Carla; Faria dos Reis Antonio Carlos; Lyra Maia Frederico Celso; Alves Leucio Camara; Pereira Patricia Mendes

来源：Semina-Ciencias Agrarias, 2015, 36(1): 295-300.

DOI：10.5433/1679-0359.2015v36n1p295

• Thoracic cavity
• metastasis
• malignant tumor
• osteoblasts

Osteosarcoma is the most common malignant bone tumor in dogs, most frequently affecting middle- to old-aged animals. It is a tumor of mesenchymal origin with great potential for the development of metastases, and is characterized by its aggressive and invasive behavior. In the axial skeleton, primary osteosarcoma is rare but may occur in the ribs, sternum, vertebrae and skull. This paper reports an atypical case of primary chondroblastic osteosarcoma of the rib with esophageal metastasis in a dog. The patient had muffled heart sounds on auscultation, expiratory dyspnea, and severe dehydration. Thoracic radiography showed generalized enlargement of the heart silhouette, suggestive of pericardial effusion. Because of a suspicion of intrathoracic neoplasia and the poor general state of the patient, euthanasia was advised. Necropsy revealed a neoplastic mass within the thoracic cavity, adhered to a rib and the sternum and pericardial sac, in addition to a metastatic mass in the esophagus. Histopathological examination confirmed the diagnosis of this neoplasia. This report describes an unusual case of primary chondroblastic osteosarcoma of the rib in a dog with metastasis in the esophagus. It is considered unusual because of the location of the tumoral mass inside the thoracic cavity and external adhesion to the pericardial sac.

• 出版日期2015