Aneurysm of anomalous splenic artery arising from a splenomesenteric trunk: Review of the literature with a report of a new case

INTRODUCTION: Aneurysm of splenic artery arising from splenomesentric trunk is an extremely rare condition. The aim of this study is to report a new case with literature review. PRESENTATION OF CASE: A 52-year-old housewife presented with mild central abdominal pain for two month duration. Abdomen was soft. Abdominal ultrasound examination showed a focal aneurysmal dilatation in the splenic artery (SA) near the portal vein. Abdominal computed tomographic angiography (CTA) revealed presence of the splenomesentric trunk with fusiform aneurysm (45 × 33 mm) of the proximal part of the SA. In supine position, through upper midline laparotomy incision, exploration of both superior mesenteric artery (SMA) and SA was performed, total excision of the aneurysm was done, the SMA was side-repaired and SA was ligated. The post-operative period was uneventful. DISCUSSION: It is interesting to note that orthotopic SA aneurysms, most commonly present in the distal third of the artery, followed by the middle third, while in cases of splenomesentric trunk, all reported cases of anomalous SA aneurysms including the current one, showed the aneurysms to be located in the proximal portion or root of the SA. CONCLUSION: Splenomesentric trunk is a rare anatomical anomaly, aneurysm of which is even rarer. It can be managed either by endovascular intervention or open surgery.