PMC6033610_01
Upper gastrointestinal contrast study showing a right-sided stomach and an abnormal position of the duodenojejunal flexure, suggestive of malrotation.
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An upper gastrointestinal contrast study was suggestive of intestinal malrotation: duodenojejunal flexure was demonstrated to the left of the midline with the stomach on the right; the proximal small bowel was on the left side of the abdomen ( Fig. 1 ). 
Intraoperative aspect: preduodenal portal vein crossing the second part of the duodenum. D1, first part of the duodenum; D2, second part of the duodenum; GB, gallbladder; PDPV, preduodenal portal vein.
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The stomach and duodenum proximal to the PDPV were distended adequately by air; however, the duodenum distal to the aberrant crossing vein remained collapsed signifying the presence of extrinsic compression ( Fig. 2 ).
PMC6033610_02