THREE hundred and forty-two patients with a preoperative diagnosis of cholecystitis were operated on at the Boston City Hospital from January 1, 1951, to January 1, 1953. The records of 13 cases were not available for study; therefore, 96.2 per cent of the records of the entire group have been reviewed. The series comprised 99 cases with a preoperative diagnosis of acute cholecystitis and 230 cases with a preoperative diagnosis of chronic cholecystitis.Sex PrevalenceAcute cholecystitis appeared one and a half times more frequently in females whereas chronic cholecystitis appeared five times more frequently in females. Although it was . . .