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要旨 LSTをLST-G-H,LST-G-MとLST-NG-FE,LST-NG-PDに分類し,LSTの肉眼型亜分類とpit patternの関係,pit patternと病理組織の関係,pit pattern診断の質診断能および深達度診断能を検討した.肉眼型とpit patternの関係では顆粒型,非顆粒型ともにIII/IV型が主体を成していた.VN型pit patternを示した病変は全例pT1b癌であった.しかし,VI型pit patternを示した病変では粘膜内癌を中心に腺腫からSM癌まで幅広く存在した.pit patternによる質診断能は異型度を高く読む傾向がみられ,深達度診断能は深達度を深く読む傾向がみられた.
We retrospectively analyzed the epidemiological data of LST(laterally spreading tumor), which was macroscopically divided into the following subtypes : LST-G-H, LST-G-M, LST-NG-FE, and LST-NG-PD. In addition, we investigated the relationship between macroscopic and histologic features and the pit pattern of these lesions to differentially diagnose adenoma and LST cancer and to determine the depth of tumor invasion in LST using pit patterns.
Macroscopic assessment showed that Type III/IV pit patterns mainly constitute the granular and non-granular subtypes of LSTs. The lesion that showed VN type of pit pattern was observed in all cases of pT1b cancer. However, the lesion that showed the VI type pit pattern was differentially diagnosed as SM cancer instead of adenoma, based on the observation intramucosal carcinoma. A tendency to read an atypical degree highly was observed in the quality diagnosis ability using pit patterns. A tendency to read the depth of tumor invasion deeply was observed in the diagnosis ability of the depth of tumor invasion using pit patterns.
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