Management of a Rare Case of Superior Mesenteric Artery Aneurysm Associated with a Pancreatic Cyst Complicated by Acute Rupture: A Case Report and Review of Literature.

Superior mesenteric artery aneurysms are a rare pathology, and rupture due to a pancreatic cyst in the context of alcohol-induced pancreatitis is an even rarer condition. The first line of treatment is usually an endovascular approach. We present the case of a 51-year-old male with alcohol-induced pancreatitis, diagnosed with a superior mesenteric artery aneurysm with active bleeding in close contact with a large pancreatic cyst. A covered stent was used to treat this condition. The patient developed hemorrhagic shock 12 h after the procedure and an urgent laparotomy was performed. A second rupture of the arterial wall at the distal end of the stent was observed and in order to obtain distal perfusion, first, an infrarenal aorta to superior mesenteric artery bypass distal to the rupture was performed in order to exclude the aneurysm. Secondly, a bypass originating from the distal end of the first bypass to the distal end of the superior mesenteric artery was performed. The patient had an uneventful recovery and was discharged after 10 days. We reviewed the literature regarding the incidence and the therapeutic management of superior mesenteric artery aneurysm complicated by pancreatic cyst. An advanced search on PubMed from 2004 to 2024 returned 194 results and after applying the inclusion-exclusion criteria, 11 publications were selected. Although the endovascular approach is usually the first line of treatment with obvious advantages for the patient, a patient-tailored approach should be made in such cases and surgery could be the first option, when considering that the mechanism of aneurysm rupture is due to erosion of the arterial wall by the pancreatic enzymes. Surgery has the advantage of cyst drainage and aneurysm exclusion and in our case proved lifesaving.