Histological Subtype and Tumor Size Takashi Kanesaka 1 , Noriya Uedo 1 , Tomoki Michida 1 , Ryu Ishihara 1 1Department of Gastrointestinal Oncology, Osaka International Cancer Institute, Osaka, Japan Keyword: 早期胃癌 , 分化型癌 , 未分化型癌 , 腫瘍径 , 拡大内視鏡 pp.9-16
Published Date 2021/1/25
DOI https://doi.org/10.11477/mf.1403202221
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 In white-light endoscopy for diagnosing early gastric cancer, differentiated-type cancer often appears reddish in color, whereas undifferentiated-type cancer appears pale. Elevated-type(0-I/0-IIa)cancer is typically a differentiated-type cancer. Furthermore, in magnifying endoscopy for diagnosing early gastric cancer, the combination of an absent microsurface pattern and opened-loop type microvessels is a feature of undifferentiated-type cancer, whereas a present microsurface pattern and/or polygonal/closed-loop microvessels are features of differentiated-type cancer. To estimate the tumor size using endoscopy, comparing the scope diameter and opening diameter of biopsy forceps, or using measure forceps, is recommended. Additionally, it is necessary to confirm the histological subtype by biopsy before endoscopic treatment and to confirm the tumor size by histological examinations using a resected specimen after endoscopic treatment.

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