Reconstrução toracoabdominal com tela de polipropileno após exérese de osteossarcoma condroblástico em cadela

Osteosarcoma is the main bone neoplasm originating in the costal arches. However, its occurrence is less common than that of appendicular osteosarcoma. Known to be locally invasive and with high metastatic potential, it generally requires multimodal treatment involving aggressive surgery and adjuvant chemotherapy. This study aims to report an unusual case of costal arch osteosarcoma in a one-year-old Pitbull dog who underwent resection of five ribs aiming at wide tumor resection, with subsequent reconstruction of the thoracoabdominal wall using polypropylene mesh. After surgical resection of the tumor, adjuvant antineoplastic chemotherapy with doxorubicin and carboplatin was administered at 21-day intervals, totaling six cycles. To date, the patient has shown no signs of local recurrence or metastasis, with a disease-free period of 16 months.