Mechanical colonic obstruction secondary to a giant aneurysm of the internal iliac artery complicated by a sigmoid volvulus: A case report and review of the literature

Internal iliac artery aneurysms are rare and generally asymptomatic. We report the case of a 90-year-old patient admitted for a low colonic obstruction. Computed tomography revealed a giant 80 mm aneurysm of the internal iliac artery compressing the recto-sigmoid junction, responsible for a mechanical obstruction complicated by a sigmoid volvulus. An emergency colo-exsufflation was performed followed by embolization. The outcome was favorable. This case illustrates the rarity of this presentation and highlights the importance of a multidisciplinary approach integrating the gastroenterologist in the management.