Surgical resection of primary leiomyosarcoma of retro-hepatic inferior vena cava extending from bilateral renal veins across the diaphragm.

Vascular leiomyosarcoma of the inferior vena cava is a rare malignant soft tissue tumor that requires surgical treatment to prevent tumor-related symptoms such as pulmonary embolism and Budd-Chiari syndrome. However, a treatment strategy for surgical resection of advanced cases has not yet been determined. This report describes the case of advanced leiomyosarcoma of the inferior vena cava that was successfully treated with surgery and subsequent chemotherapy. A 44-year-old man was found to have a 12 × 10 cm retroperitoneal tumor on computed tomography. The tumor originated in the inferior vena cava and extended beyond the diaphragm into the renal vein. The surgical plan was determined in joint consultation with the multidisciplinary team. It was safely resected and the inferior vena cava was closed caudal to the porta hepatis without a synthetic graft. The tumor was diagnosed as leiomyosarcoma. Doxorubicin, followed by pazopanib were administered as treatment for metastatic disease. Eighteen months after the surgery, the patient's performance status was maintained.