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A Case of Early Colorectal Cancer Arising from a Sessile Serrated Lesion(SSL with Intramucosal Cancer) Takashi Murakami 1 , Naoki Tsugawa 1 , Yuka Hirasawa 1 , Wataru Hata 1 , Yudai Otsuki 1 , Tomonori Yamauchi 1 , Eiji Kamba 1 , Hirofumi Fukushima 1 , Tomoyoshi Shibuya 1,2 , Takashi Yao 3 , Akihito Nagahara 1,2 1Department of Gastroenterology, Juntendo University Faculty of Medicine 2Department of Pathophysiological Research and Therapeutics for Gastrointestinal Disease, Juntendo University Faculty of Medicine 3Department of Human Pathology, Juntendo University Graduate School of Medicine Keyword: SSL , sessile serrated lesion , SSLD , SSL with dysplasia , 大腸癌 , serrated pathway , 大腸鋸歯状病変 pp.579-584
Published Date 2026/4/25
DOI https://doi.org/10.11477/mf.053621800610040579
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 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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電子版ISSN 1882-1219 印刷版ISSN 0536-2180 医学書院

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