An ultrasound scan is recommended for the investigation of post-cholec
ystectomy symptoms. In two patients ultrasound scan reported a persist
ent gall-bladder following laparoscopic cholecystectomy. ERCP identifi
ed a choledochal cyst in one and no abnormality in the other. Failure
to detect choledochal cysts is equally likely following laparoscopic a
nd open surgery, and ERCP should be considered the investigation of ch
oice for recurrent symptoms following cholecystectomy.