Midgut volvulus in an 11-year-old boy. (a) Axial contrast-enhanced CT shows transposition of superior mesenteric artery (arrowhead) and vein (arrow). (b, c) Axial CT below (a) shows “whirlpool sign” (arrow) which consists of wrapping of the superior mesenteric vein and its branches, mesenteric fat, bowel loops around the superior mesenteric artery in the clockwise direction. (d, e) UGIS shows “corkscrew sign” (arrows), a spiral configuration of the 4th portion of the duodenum and proximal jejunum

Meckel diverticulitis in a 23-year-old man. (a, b) Axial (a) and coronal (b) contrast-enhanced CT shows a tubular structure (curved arrow) with enhancing thick wall adjacent to distal small bowel loops. Note fat stranding (asterisks) around the tubular-enhancing structure. (c) Tc-99m pertechnetate scintigraphy shows a persistent focus of uptake (curved arrow) in the right upper side of the urinary bladder, suggesting the presence of heterotopic gastric mucosa. (d) Gross specimen shows inflamed Meckel diverticulum (arrows)

Meckel diverticulum in a 51-year-old woman. (a, b) Axial contrast-enhanced CT shows a fluid-filled tubular structure coursing in a craniocaudal direction. Note normal appendix (arrowheads). (c) Coronal CT shows a large fluid-filled curved tubular structure (arrows) in the abdomen. (d) Gross specimen shows a giant Meckel diverticulum (arrows) arising from the ileum

Meckel diverticulum with small bowel obstruction in a 48-year-old man. (a–e) Axial and coronal contrast-enhanced CT images show a fluid-filled curved tubular structure (asterisks) which originates from the distal ileum (arrow). Diffuse fluid-filled small bowel dilation is seen, which suggested small bowel obstruction. The transitional point (arrowhead) is noted near the origin site of the tubular structure, with the proximal small bowel feces sign (curved arrow). (f) Gross specimen of the resected small bowel shows a Meckel diverticulum (asterisks) originating from the ileum