三次元画像表示が有用であった静脈硬化症による大腸虚血性病変2例

Three-Dimensional (3D) Images of the Ischemic Colonic Lesions Caused by Phlebosclerosis, Report of Two Cases

要旨　ヘリカルCTを用いて静脈硬化症による大腸虚血性病変の2例の三次元画像を作成し，本病変の特徴である大腸に沿った石灰化について，静脈および腸管壁との立体的関係を観察した．腸管壁外の石灰化は腸問膜静脈の末梢側に沿ってみられた．腸管壁内の石灰化は主として腸壁の漿膜側にあり，腸間膜付着側に観察された．石灰化の観察には三次元画像に加えMIP(maximum intensity projection)処理像の併用が病変の立体構築の把握に有用であった．

　Three-dimensional (3D) images using a helical CT were made in two patients who were diagnosed as having ischemic colonic lesions caused by phlebosclerosis, and, because of remarkable calcification, a relationship between the venous and the intestinal wall was observed. Extramural calcification was observed peripherally position along the mesenteric vein. Intramural calcification was mainly observed on the serosal side of the intestinal wall, and also on the mesenteric side. A combination study between 3D images and a maximum intensity projection (MIP) was useful for stereo graphical observation of these areas of calcification.