Volvulus of the gall bladder diagnosed by ultrasonography, computed tomography, coronal magnetic resonance imaging and magnetic resonance cholangio-pancreatography

Figure 1 Abdominal ultrasonography revealed an abnormally large floating gallbladder without gallstones, and a thickened gallbladder wall.

Figure 2 Abdominal enhanced computed tomography revealed a dilatated gallbladder, but a non-enhanced gallbladder wall.

Figure 3 MRCP demons-trated dilatation of the gall-bladder, but its image identified no gallbladder neck.

Figure 4 Coronal MRI revealed a dilatated gallbladder, and its invagination-like image identified the neck of the gallbladder.

Figure 5 At laparotomy, macroscopic findings showed a distended and gangrenous gallbladder along with a counterclockwise torsion of 360 degrees of the gallbladder mesentery.