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A Small 0-IIa+IIc Depressed-type T1b Colorectal Cancer in the Transverse Colon Kenjiro Shigita 1 , Gentaro Shindo 2 , Naoki Asayama 2 , Taiki Aoyama 2 , Akira Fukumoto 1 , Shinji Nagata 2 , Mayumi Kaneko 3 1Department of Endoscopy, Hiroshima City North Medical Center Asa Citizens Hospital, Hiroshima, Japan 2Department of Gastrointestinal Medicine, Hiroshima City North Medical Center Asa Citizens Hospital, Hiroshima, Japan 3Department of Diagnostic Pathology, Hiroshima City North Medical Center Asa Citizens Hospital, Hiroshima, Japan Keyword: 0-IIc陥凹型大腸癌 , 早期大腸癌 , JNET分類 , pit pattern , T1b癌 pp.601-605
Published Date 2026/4/25
DOI https://doi.org/10.11477/mf.053621800610040601
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 Depressed-type early colorectal cancer can be a high-risk lesion, even when it is small, because it may show submucosal invasion and lymph node metastasis. We encountered a 10mm 0-IIa+IIc depressed-type lesion in the transverse colon detected by positive fecal occult blood testing. Converging folds were seen around the lesion. Magnifying narrow-band imaging revealed Japan NBI Expert Team(JNET)type 3, and chromoendoscopy with crystal violet showed severely irregular-type VI pits with a focal VN pit pattern, resulting in a diagnosis of clinical T1b cancer. Despite recommending surgery, endoscopic mucosal resection was performed at the patient's request. Pathology revealed pT1b cancer with venous invasion, and additional segmental colectomy was performed. This case suggests that the choice of treatment for depressed lesions should not be based on lesion size alone ; rather, they should be regarded as non-polypoid de novo malignancies, and invasion depth should be assessed comprehensively by combining conventional and magnifying endoscopic findings.


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電子版ISSN 1882-1219 印刷版ISSN 0536-2180 医学書院

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