Fig. 1

Example of a normal secretin-stimulated MRCP in a patient being investigated for sphincter of Oddi dysfunction, with idiopathic dilatation of the CBD. a Thick coronal slab at baseline shows the pancreatic duct is of normal caliber (arrow) with little secretions in the duodenum (D); b) at 3 min there is progressive filling of the duodenum (D) due to an increase in pancreatic secretions and the pancreatic duct has become more prominent (arrow); c) at 9 min, the pancreatic duct has returned to baseline calibre (arrow)