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Japanese

Effectiveness of Magnifying Endoscopy in Diagnosing the Invasion Depth of Pedunculated and Semi-pedunculated Colorectal Cancer Yuichiro Tsuji 1,2 , Osamu Tsuruta 1,2 , Hiroshi Kawano 1,2 , Ken Toubaru 1,2 , Atsushi Toyonaga 1,2 1Department of Medicine II, Division of Gastroenterology and Endoscopy, Kurume University School of Medicine Keyword: 隆起型早期大腸癌 , 拡大内視鏡 , pit pattern , 通常内視鏡 , 深達度診断 pp.1571-1581
Published Date 2002/11/25
DOI https://doi.org/10.11477/mf.1403104594
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 We evaluated the effectiveness of magnifying endoscopy by comparing its results with those of conventional endoscopy in diagnosing the invasion depth of pedunculated and semi-pedunculated colorectal cancers. The materials consisted of 42 colorectal tumors examined by both conventional and magnifying endoscopy. In this study, we created the subclassification of type VⅠ pit pattern, namely, type VⅠ with clear outline and that with unclear outline. The accuracy rate, sensitivity and specificity of conventional endoscopy in the diagnosis of the depth of invasion into the submucosa (sm2,3) was a little higher than that of magnifying endoscopy. Furthermore, we classified the conventional endoscopic diagnosis into 2 groups : a definite diagnosis and a probable diagnosis, and evaluated the accuracy rate, sensitivity and specificity in the diagnosis of each group in combination with magnifying endoscopic diagnosis. Using this combination, the 6 probable diagnostic lesions decreased to 2 and the accuracy rate in the diagnosis of sm2,3 invasion in the definite diagnostic lesions was improved from 77.8% (7/9) to 84.6% (11/13). In summary, magnifying observation improved the quality of diagnosis of invasion depth. In comparative and histological studies, it seems that unclear outline of VⅠ indicates the degeneration and disappearance of foveolar epithelium, revealed by the dye spray technique, that appears on the surface of invasive cancer.


Copyright © 2002, Igaku-Shoin Ltd. All rights reserved.

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

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