Torsion of the gallbladder in an adult: a rare case of acute cholecystitis.

Torsion of the gallbladder is a rare condition that is generally due to an abnormal anatomical variation, i.e., the presence of a long mesocyst with loss of fixation of gallbladder to the inferior margin of the liver. The clinical features closely mimic those of acute cholecystitis. In any case, the definitive diagnosis is made during surgery. We report a case of gallbladder torsion in an 80-year-old woman. She underwent laparoscopic cholecystectomy with an uneventful postoperative course.