Renal vein leiomyoma: a rare entity with review of literature.

Tumors of vascular origin are unusual. These tumors are predominantly malignant and commonly arise from the inferior vena cava. Benign smooth muscle tumors arising from renal vein are very rare. We present a case of leiomyoma of renal vein in a post-menopausal woman that clinically resembled a retroperitoneal paraganglioma.