Partial cranial internal hemipelvectomy in a feline patient with ilial osteosarcoma - a case report.

Partial cranial internal hemipelvectomy with adjuvant chemotherapy provides excellent outcomes for feline ilial osteosarcoma.

This case report documents successful treatment of ilial osteosarcoma in a 15-year-old male domestic shorthair cat using partial cranial internal hemipelvectomy. Imaging revealed an osteolytic lesion with soft tissue invasion but no pulmonary metastasis. Histopathology confirmed poorly differentiated chondroblastic osteosarcoma with clear surgical margins (minimum 9-mm tumor-free margin). The surgical technique preserved the ipsilateral pelvic limb and caudal sacroiliac joint, allowing normal limb function. The cat received adjuvant carboplatin chemotherapy beginning 20 days post-operatively for six cycles. Recovery was unremarkable with normal activity resumed by three weeks and no lameness observed. Extended follow-up at 473 days post-surgery showed no evidence of metastasis on thoracic radiographs or local recurrence on pelvic radiographs, with the patient remaining active and disease-free. This case demonstrates that partial cranial internal hemipelvectomy is a viable surgical option for feline ilial wing osteosarcoma, offering excellent functional outcomes and disease control when combined with adjuvant chemotherapy.

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