Fig. 3

The classification of volvulus. a The proximal and distal bowel are twisted like a torsion pendulum by an abnormality such as a tumor. b The proximal and distal bowel are rotated on an axis formed by a fixed point on the abdominal wall. c Volvulus occurs due to the adhesion (arrow: torsion origin) of the proximal and distal bowel or the adhesion of the bowel and mesocolon