Inferior Vena Cava Tumor Thrombus Secondary to a Mixed Germ Cell Tumor: A Case Report of Multimodal Management With a Favorable Outcome.

Inferior vena cava (IVC) thrombus arising from testicular tumors is a rare clinical entity. Diagnostic imaging and subsequent pathological examination can help confirm a mixed germ cell tumor with an IVC thrombus. We present a case of a 19-year-old male with a right testicular tumor and IVC thrombus, successfully managed with a combination of a temporary IVC filter, anticoagulants, and systemic chemotherapy. The patient presented with a two-month history of right testicular swelling, significant weight loss, and other constitutional symptoms. He underwent right radical inguinal orchiectomy and received BEP (bleomycin, etoposide, and cisplatin) chemotherapy. Post-chemotherapy, the thrombus resolved completely, and the patient has remained disease-free for 24 months. This report highlights the presentation, diagnosis, treatment, and prognosis of metastatic testicular cancer with IVC tumor thrombus.