Acute torsion of the gallbladder.

Torsion of the gallbladder is an uncommon process that is usually found at the time of exploration for an acute surgical abdomen. It results from two congenital anomalies and may be complete or partial. It should be considered in the etiology of what appears to be acute cholecystitis in the elderly, thereby prompting early surgical management. Two cases are presented to help define the true incidence of this process.