Evaluation of peripancreatic extension or invasion in pancreatic disease is an important role of CT(Com- puted Tomography) We analyzed the abdominal CT findings of 104 normal patients(including the patients with trivial disease processes not related to pancreas) in regard to whether they actually would visualize the peripancratic fat lines distinctly or not. In regard to adjacent organs the duodenal second portion showed the highest rate of obliteration of peripan-creatic fat lines (75.0%) In regard to adjacent vessels the portal confluence showed the higgest rate of obliteration (93.75%) and the superior mesenteric vein and the splenic vein also showed high rates of obliteration of peripancreatic fat lines (89.3% and 78.4% respectively). And the superior mesenteric artery showed the remarkable preservation rate of 98.1%.