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要旨●本稿では小腸の良性腫瘍および腫瘍様病変として,比較的特徴的な形態を呈することが多い,腺腫,脂肪腫,リンパ管腫,Peutz-Jeghers型ポリープ,Cronkhite-Canada症候群,若年性ポリープ,血管性病変,pyogenic granuloma,異所性膵,IFP(炎症性線維性ポリープ),Meckel憩室内翻症を取り上げ,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.これらの診断には,病変の頂部のみならず基部を含めた病変表面性状の確認に加え,管外性発育傾向の有無や石灰化の有無など随伴所見の評価が重要である.
On the basis of our cases and reviews of previous reports, this study aimed to investigate the morphological features and differential diagnosis of the following tumors and tumorous lesions in the small intestine:adenoma, lipoma, lymphangioma, Peutz-Jeghers-type polyp, Cronkhite-Canada syndrome, juvenile polyp, arteriovenous malformation or Dieulafoy's lesion, pyogenic granuloma, inflammatory fibroid polyp, and inversion of Meckel's diverticulum. Confirming the surface characteristics and color tone of the top and stem of a tumorous lesion, as well as the presence or absence of growth outside the gastrointestinal tract and other associated findings like calcification, is important for differential diagnosis.
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