Fig. 2From: Endoscopic features for early decision to evaluate superior mesenteric artery syndrome in childrenUpper gastrointestinal series shows abrupt vertical or oblique cutoff of contrast at the midline of the third lumbar level. The upper edge of the cutoff is sharp (white arrow), and lower edge is blunt and smooth (black arrow). These reflect the external compression of duodenum by the superior mesenteric arteryBack to article page