A 50 year old man is described with hepatic dysfunction and chronic pa
ncreatitis in whom greatly increased concentrations of the pancreatic
tumour marker CA 19-9 combined with an abnormal appearance at endoscop
ic retrograde cholangiopancreatography lead to the false suspicion of
pancreatic carcinoma. CA 19-9 concentrations should be interpreted wit
h caution in patients with intrinsic liver disease or biliary obstruct
ion.