Abstract
The author carried out a study on 549 necropsy cases without primary disease of pancreas (tumor, inflammation, hemorrhage, necrosis, diabetes mellitus) between the years 1962 and 1969. This survey consisted primarily of pathological examination of principal athological-anato -mical changes, fibrous increase was observed in 400 cases (73%) .
Fibrous increase of the pancreas was classified morphologically into 3 types ; 1) intralo-bar type (247 cases), 2) interlobar type (59 cases), 3) mixed type (94 cases) . They were also histogenetically devided into the following three types ; 1) periductal type (297 cases) . 2) perivascular type (7 cases), 3) mixed type (96 cases) .
Fibrous increase in the pancreas originated with replacement of the residual necrosis owing to various generalized disorders, particularly of neighbouring tissues and viscerae. This fibrous tissue increases progressively and irreversively.
