Fig. 2
MRI before surgery. A The previously diagnosed 12 cm tumor with homogeneous adipose intensity is visible in the pancreatic head (arrowheads). B A solid T2-low intensity mass appeared at the upper margin of the tumor (arrow), which invaded and obstructed the distal common bile duct. C Diffusion-weighted imaging showed a high-signal intensity mass at the upper margin of the adipose tumor (arrow). D Magnetic resonance cholangiopancreatography showed no stenosis or other specific findings in the main pancreatic duct