Osteossarcoma extra-esquelético intra-abdominal em canino da raça perdigueiro

Abstract

Extra-skeletal osteosarcoma is a rare malignant mesenchymal tumor that primarily affects older dogs, with a higher predisposition in females. This type of cancer, although normally affecting long bones, can occur in any tissue and is characterized by the proliferation of mesenchymal cells that produce bone matrix without involvement of adjacent bone tissue. This study aims to report a case of extra-skeletal osteosarcoma in a seven-year-old female Fila Brasileiro dog. The animal was treated at the Veterinary Hospital of the Federal University of Paraíba - UFPB, where diagnosis and classification were performed through detailed clinical, laboratory, and histopathological evaluation. In the macroscopic examination, the biological material presented firm and soft areas, with an irregular multilobulated yellow-red surface. In the microscopic examination, the presence of extracellular matrix, osteoblasts, and osteoclasts was observed. Based on these findings, it was possible to reach a diagnosis of extra-skeletal osteosarcoma.