endoscopic retrograde cholangiopancreatography revealed a short obstructing stenosis of the main pancreatic duct in the head of the pancreas , marked and tortuous dilatation of the prestenotic portion of the main pancreatic duct and its side branches , and a filling defect in the side branch in the body of the gland .
C0008310
endoscopic
C0030288
main pancreatic duct