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Fig. 1C —34-year-old man with nonspecific abdominal pain. Axial MRI small-bowel follow-through reveals abnormal anterior relationship of third part of duodenum relative to superior mesenteric vessels (white arrows, A). Compression and torsion of duodenum as it courses anteriorly results in beak sign (arrowhead, A). At same level, superior mesenteric vein passes posterior to superior mesenteric artery, creating "swirl sign" (black arrow, A). Further distally, duodenum courses posteriorly around mesenteric vessels, providing corkscrew appearance (white arrows, B and C). High cecum (curved black arrows, A–C) and terminal ileum (curved white arrow, B and C) are shown. These findings are typical of malrotation.