1.4　Imaging

Diffuse enlargement of the pancreas with loss of the normal lobulated contour is the classical appearance of AIP on cross-sectional imaging.Typically，enhancement is decreased during the early phase and delayed in the late phase due to inflammation.A low attenuating rim，termed capsule-like rim，is known to be highly characteristic of AIP（Fig.11.1a）.(https://www.daowen.com)

Typical pancreatograhic findings are long（＞1/3 length of the MPD）or multiple strictures without marked dilatation of the upstream MPD，but with side branches arising from strictured segments（Fig.11.l b）.