A 45-year-old white woman was found on selective superior mesenteric artery angiography to have an aneurysm arising in an aberrant hepatic artery. The aberrant hepatic artery originated from the superior mesenteric artery, and was the only artery supplying the liver. The aneurysm was excised and continuity of the aberrant artery was restored by insertion of a short segment of autogenous long saphenous vein.