Management of Metastatic Primary Renal Synovial Sarcoma with Inferior Vena Cava Thrombus: A Rare Case Report

Synovial sarcomas constitute 5-10% of all soft-tissue sarcomas and tend to occur in the extremities, particularly the lower extremity. Renal sarcoma is a rare entity, constituting approximately 1-5% of all malignant renal tumours. Metastatic large renal synovial sarcoma with Inferior Vena Cava (IVC) thrombus is a rare surgical challenge that demands thorough preoperative evaluation and planning for its management. A 31-year-old young male presented with symptoms of left flank pain for 10 days, with a past history of similar complaints two years prior. On examination, a massively large renal mass was palpable. A Computed Tomography (CT) scan showed an IVC thrombus and metastatic deposits. The patient underwent a radical nephrectomy with ileal segment resection, followed by chemotherapy, which showed near-complete resolution of the metastatic deposits. Renal synovial sarcoma should be considered as a differential diagnosis in young patients presenting with a metastatic, exceptionally large renal mass complicated by an IVC thrombus, necessitating thorough preoperative evaluation for effective management.