A case of a benign tumor with marked melanin pigmentation localized within the inferior vena cava.

A 65-year-old woman with no significant medical history was incidentally found to have a well-circumscribed lesion in the inferior vena cava on computed tomography. Despite unremarkable clinical findings and inconclusive preoperative assessments, she underwent surgical resection for diagnostic and therapeutic purposes. Complete excision was achieved, and histopathological analysis revealed a benign tumor with abundant melanin pigmentation. No recurrence was observed during 1 year of follow-up without adjuvant therapy. This case highlights the importance of surgical intervention for both diagnosis and treatment in managing tumors of the inferior vena cava.