Fig. 4
“Whirlpool sign” in different patients. a, b A 34-year-old male with volvulus from the surgical group (DYJRCR, type 4a). The images show torsion of duodenum, proximal jejunum and mesenteric vessels (arrow). c A 30-year-old male with volvulus from the surgical group (DYJRCM, type 6). d, e Two males with volvulus from the conservative group (DYJRCR, type 4a). The degree of torsion of vessels and intestines is mild (arrow). f A 51-year-old asymptomatic female (DYJRCR, type 4a). The portal vein rotates anterior to the superior mesenteric artery