- Etiology: thin body habitus, recent severe weight loss, scoliosis surgery
- UGI: obstruction at duodenal horizontal limb by superior mesenteric artery
- CT: SMA angle to aorta normally 45 degrees but in SMA syndrome is 6-25 degrees, SMA to aorta distance normally 10-20 mm but in SMA syndrome is 2-8 mm
- Treatment: feeding tube tip beyond ligament of Treitz
- Clinical: postprandial discomfort, bilious vomiting
