Fig. 5
From: Magnetic resonance cholangiopancreatography: the ABC of MRCP
a Example of an extra-ductal factor causing a potential pitfall in interpretation. Coronal MIP reformat suggests a stricture or possible filling defect in the common hepatic duct (arrow) but with no upstream dilatation. Incidental note is also made of a small pseudocyst (P) associated with the main pancreatic duct due to a history of pancreatitis. b Thin-section MRCP image more clearly shows that this is due to extrinsic compression from the right hepatic artery which appears as a subtle curvilinear signal void outside the duct and extending across it (arrows)