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This article presents the clinical observation of the diagnosis and treatment of type II endoleak – complications in the late postoperative period following endoprosthetics of an aneurysm of the infrarenal abdominal aorta in a 64-year-old patient. On the regular follow-up MSCT-angiography, the growth of aneurysmal sac was detected with no obvious signs for the presence of endoleak. During selective angiography of superior mesenteric artery, the path of blood reflux into the isolated aneurysm cavity from the trunk of the inferior mesenteric artery was well visualized. Embolization of the inferior mesenteric artery was performed. Rare anatomical variant of blood supply to the splenic angle and descending colon was revealed. This clinical case describes an effective method for eliminating type II endoleak.