A very large bile duct stone

Out patient was a 65 year old lady who had Addison's disease and diabetes. She had developed obstructive jaundice and the cause was a very large bile duct stone. During ERCP, contrast injection outlined the stone and a particularly dilated CBD (A: green arrow). The stone couldn't be extracted so we passed a 10 French plastic stent of 10cm length (B: green arrows). There's a possibility of a choledochal cyst in this case. We will be reviewing this case in our joint meeting with the hepatobiliary surgical team.