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要旨●SSL(sessile serrated lesion)は右側結腸に発生する前癌病変である.SSL内にdysplasiaが生じたSSLD(SSL with dysplasia)はPCCRC(post-colonoscopy colorectal cancer)の原因の一つとされており,早期診断が重要である.今回,大腸内視鏡検査で上行結腸に厚い粘液を伴う12mm大の0-Is型病変を認めた.粘液除去後,病変内に発赤を伴う小結節を認め,同部はNBI拡大ではJNET分類Type 2B,色素拡大ではVI型軽度不整pitを呈した.EMRを施行し,病理学的にSSLに付随した高分化管状腺癌(pTis)を確認した.免疫組織化学染色ではMLH1発現は癌部で低下していた.本症例は,SSLDの早期診断において粘液除去と微細所見の注意深い観察が重要であることを示唆する症例である.
Sessile serrated lesions(SSLs)are precancerous lesions commonly arising in the right colon. When dysplasia develops within an SSL, the lesion is termed an SSL with dysplasia, which is considered a cause of post-colonoscopy colorectal cancer. Therefore, early detection is essential. In this case, colonoscopy revealed a 12mm, 0-Is lesion in the ascending colon covered by thick mucus. After careful removal of the mucus, a small reddish nodule was identified within the lesion. Magnifying narrow-band imaging(NBI)revealed a JNET Type 2B pattern, and chromoendoscopy with crystal violet staining demonstrated a VI-mild irregular pit pattern. Endoscopic mucosal resection(EMR)was performed, and histology confirmed a well-differentiated tubular adenocarcinoma(pTis)arising within the SSL. Immunohistochemistry revealed decreased MLH1 expression in the cancerous area. This case highlights the importance of thorough mucus removal and careful evaluation of subtle endoscopic findings for the early diagnosis of SSL with dysplasia.

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