Fig. 2

Positron emission computed tomography findings. a The round mass of the head of the pancreas exhibited posterior protrusion, with increased tracer distribution (SUVmax 6.91). The lesion involved the adjacent common bile duct and no abnormality was observed in the remaining pancreas. b Two abnormal perfusion foci in the retroperitoneum (behind the head of the pancreas) were closely attached to the abdominal aorta and left renal vein (SUVmax 4.45)