<prompt> Following is an exception to Courvoisiers law:Cancer of ampullaCancer of pancreasCancer of bile ductPrimary oriental cholangiohepatitis causing stones in the CBD.  <response>: Primary oriental cholangiohepatitis causing stones in the CBD Exceptions to Courvoisiers law: Double impaction - one stone in CBD and stone in cystic duct. Periampullary carcinoma in a patient who has undergone cholecystectomy. Primary oriental cholangiohepatitis causing stones in the CBD gall bladder is normal in these cases. 