Figure 13. Dynamic MRCP images (A obtained before secretin administration, B and C obtained 2 and 5 minutes, respectively, after secretin administration) in a patient with an ampullary tumor shows an increase in the caliber of the pancreatic duct (arrow) and an incomplete recovery of the baseline value 10 minutes (D) after the administration of secretin. Associated biliary tract dilatation is seen (arrowheads).