Superior Mesenteric Artery Syndrome: Clinical and Radiological Considerations

Background. Superior mesenteric artery (SMA) syndrome is a rare condition of duodenal obstruction, caused by the overlying SMA. Aim. To report on our experience with the management of SMA syndrome, drawing the attention to its existence. Material and Methods. We reviewed our records to identify cases diagnosed with SMA syndrome, in the period from October 1995 to January 2012. Results. Seven patients were identified, one male and six females. Their mean age was 17.1 years. Vomiting and abdominal pain were the presenting complaints in all patients and history of weight loss was present in six of them. In no patient was the diagnosis suspected initially on clinical grounds. Only after radiological investigations was the diagnosis declared. Radiology took the form of gastrografin/barium meal only in four patients and both gastrografin/barium meal and computerized tomography scan in the remaining three. Four patients responded to medical treatment and surgery was performed in the remaining three, with open duodenojejunostomy in two patients and laparoscopic dissection of the ligament of Treitz in the third. Long lasting improvement was sustained in all patients except one in the surgery group who, despite initial improvement, still has infrequent attacks of abdominal pain. Conclusion. Although the clinical manifestations of SMA syndrome are shared with many other disease entities, it has unique radiological as well as endoscopic features, which enables a confident diagnosis to be made. Once diagnosed, conservative treatment with nutritional support and positioning should be tried first. In case of unresponsiveness, surgery may give a lasting cure.