A case of giant cell osteosarcoma in a Scottish fold cat

This study describes a case of giant cell osteosarcoma (GCO) localised on the right scapulae in six-year-old neutered male Scottish Fold cat. GCO is rare tumour domestic animals. also known as cell-rich osteosarcoma. Multinucleated cells and osteoid structures are observed GCO. The mass was 4.6 x 4.4 4.3 cm size very firm. Microscopically, fusiform spindle-shaped multinucleated were observed. There 4-8 mitotic figures three random high-power fields (400x). Osteoid necrosis detected several areas. In these areas, atypia cells. Immunohistochemically, vimentin expression neoplastic No immunoreactivity against actin cytokeratin Additionally, periphery blood vessels vessel smooth muscle As result histopathological immunohistochemical findings, determined to be