A 68-year-old man with a history of retroperitoneal fibrosis was referred to our clinic because of disabling bilateral lower extremity swelling and venous claudication, worse on the right side than on the left. He was noted to have a duplicated inferior vena cava and an iliac vein obliteration from retroperitoneal fibrosis. The patient underwent bilateral iliac vein stenting and had complete relief of symptoms through follow-up of 46 months with no recurrence. Keywords: Inferior vena cava duplication, Retroperitoneal fibrosis, Venous compressio