Agenesis of the gall bladder, an unexpected finding during laparoscopy; case report.

Congenital agenesis of the gall bladder is a very rare ranging from 0.02% to 0.002% in clinical practice. There is complete absence of the gall bladder with normal intra and extra hepatic biliary tree. The exact etiology remains unclear. Low index of suspicion and failure of routine investigations will result in its unexpected discovery during surgery. The condition usually results in diagnostic dilemma both before surgery and intraoperatively. A 25-year-old lady presented with repeated attacks of right side abdominal pain for 1 year. Abdominal examination showed tenderness on palpation in the right hypochonrdium. Abdominal ultrasound showed normal common bile duct with suspicion of small contacted gall bladder. MRCP showed extrahepatic biliary tree and not visualized gall bladder. During diagnostic laparoscopy exploration of the whole peritoneal cavity was performed. The gall bladder was not visualized after complete visualization of biliary anatomy. The appendix was inflamed with multiple adhesions with the bowel. The cecum was high placed in the sub-hepatic region. Laparoscopic appendicectomy was performed. Patients with gall bladder agenesis surprisingly have symptoms similar to cholecystitis, the pain may be attributed to cholangitis, biliary stones, or sphincter of Oddi dysfunction. When the condition diagnosed at operation extensive dissection to identify the gall bladder must be avoided because it may result in biliary injury.