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要旨●小腸において粘膜下腫瘍様隆起の形態を呈する腫瘍性・腫瘍様病変として,GIST,脂肪腫,IFP,異所性膵,NET,Meckel憩室内翻症,リンパ管腫,pyogenic granuloma,血管性病変(Dieulafoy's lesion/AVM)を取り上げ,自験例と過去の報告に基づいて,各病変の形態的特徴と鑑別診断を概説した.これらの鑑別には,病変の頂部のみならず基部を含めた病変表面性状・色調の確認と管外性発育傾向の有無の確認が重要である.また,顕性出血例においては,pyogenic granulomaと血管性病変の可能性を念頭に置く必要がある.
In this study, based on our own cases and reviews of past reports, we investigated morphological features and differential diagnosis of the following tumors and tumorous lesions in the small intestine exhibiting submucosal tumor-like bulging:GIST(gastrointestinal stromal tumor), lipoma, IFP(inflammatory fibroid polyp), ectopic pancreas, NET(neuroendocrine tumor), inversion of Meckel's diverticulum, lymphangioma, pyogenic granuloma, and Dieulafoy's lesion/AVM(arteriovenous malformation). For differential diagnosis, it is important to confirm surface characteristics and color tone of not only the top part of a tumorous lesion but also its stem, in addition to the presence or absence of growth outside the gastrointestinal tract. In addition, in the case of overt bleeding, it is necessary to consider the possibility of vascular lesions, including pyogenic granuloma and Dieulafoy's lesion/AVM.
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