Open Management of a Symptomatic Superior Mesenteric Artery Aneurysmal Dissection
Devan Girish, BA; Amin Shabaneh, MD; John Pate, DO; Neal Talukdar, DO; Anthony Grieff, MD
- Abstract
- Background
Superior mesenteric artery aneurysms (SMAAs) are rare but carry a significant risk of rupture, with reported mortality rates after rupture approaching 25% to 70%. Clinical presentation is often nonspecific, including abdominal pain, weight loss, and decreased appetite, leading to delays in diagnosis. While endovascular repair is preferred when anatomically feasible, aneurysms involving multiple branch vessels often require open surgical reconstruction.
Case Description
We present the case of a 37-year-old male who presented with worsening diffuse abdominal pain for three days. His past medical history includes hypertension, methamphetamine use, tobacco use, mitral valve prolapse, and prior ascending hemi-arch repair for type A aortic dissection, consistent with underlying aneurysmal degeneration. CT angiography revealed a descending thoracic aortic dissection with an associated distal hemiarch aneurysm and a 2.5 cm proximal SMA aneurysm with a distal dissection flap. Multiple jejunal branches originated from the aneurysmal segment of the SMA.
Given the concern for visceral malperfusion and potential rupture, he was taken to the operating room for open SMA aneurysm repair. A midline laparotomy was performed, and the SMA aneurysm was identified at the base of the transverse mesocolon, densely adherent to the posterior peritoneum.
After obtaining proximal and distal SMA control and controlling multiple jejunal branches, the aneurysm was opened longitudinally, revealing a dissection flap with two perfusing lumens. An interposition reconstruction was performed using a rifampin-soaked Dacron conduit with an end-to-end distal anastomosis to the ileocolic artery beyond the dissected segment. The jejunal branches were reimplanted using Carrel patches anastomosed to the graft.
Results
Intraoperative assessment demonstrated strong Doppler signals in all reconstructed branch vessels with excellent flow through the reconstructed SMA. There was preserved perfusion throughout the small bowel mesentery with no evidence of visceral malperfusion.
Conclusion
SMAAs are not well studied in the literature, and there remains a lack of consensus in their management. This case highlights the complexity of treating SMAAs with associated dissection, particularly when multiple branch vessels are involved. In anatomically challenging cases, open reconstruction with branch reimplantation offers a safe and effective approach to restore mesenteric perfusion.
Lay Summary
Superior mesenteric artery aneurysms occur when a blood vessel supplying the intestines becomes enlarged and weakened. Although rare, they are dangerous because they can rupture, causing life-threatening complications. Symptoms such as abdominal pain and weight loss are often vague, which can delay diagnosis.
This case describes a young man with a complex aneurysm and a tear in this artery. Because several smaller vessels branched from the damaged area, minimally invasive repair was not possible. Surgeons performed an open operation to remove the damaged segment and rebuild it using a synthetic graft. The smaller vessels were preserved by removing them with small patches of surrounding tissue, similar to cutting out a button with fabric attached, and sewing them onto the graft to maintain blood flow.
Open surgical repair with vessel reimplantation is safe and effective for complex intestinal artery aneurysms. Documenting such cases helps guide treatment, standardize care, and improve outcomes. - Presented by
- Girish, Devan, BA
- Institution
- University of Missouri - Kansas City School of Medicine; St. Luke's Hospital






































