Figure 9b.  Duct of Wirsung and diminutive duct of Santorini in a 51-year-old man with acute pancreatitis. (a) MR cholangiopancreatogram shows the major drainage route of the pancreas through the duct of Wirsung (arrow) at the major ampulla. Note the distal bile duct (arrowheads). (b) MR cholangiopancreatogram obtained 5 mm anterior to a reveals a persistent but diminutive duct of Santorini (arrow) entering the minor ampulla cephalad to the duct of Wirsung (arrowheads).