Congenital duplication of the gallbladder.

Duplication of the gallbladder is a rare congenital anomaly of the biliary system. In this article, two cases of gallbladder duplication are presented. The first case is a patient with double gallbladder and concomitant choledocholithiasis. The probable diagnosis of double gallbladder was made preoperatively by computed tomography. The patient underwent a successful open cholecystectomy and common bile duct exploration. In the second case, two cystic formations in the place of gallbladder are demonstrated with ultrasound scan in a woman with acute cholecystitis. At surgery, two gallbladders were found. A brief review of epidemiology and anatomy of double gallbladder is included, along with a discussion of the difficulties in diagnosis and treatment of this condition.