the intrapancreatic strictures of chronic pancreatitis are characteristically smooth and tapering on endoscopic retrograde cholangiopancreatography ( ercp ) , but in some patients , they may have a sharp cut-off and closely resemble the appearance of carcinoma of the pancreas invading the bile duct .
C0008310
endoscopic retrograde cholangiopancreatography
C0005400
bile duct