Diagnosis of Protruded (Type Is) Submucosal Invaded Cancers Shin-ei Kudo 1 , Taisuke Komatsu 1 1Department of Gastroenterology, Akita Red Cross Hospital Keyword: 大腸Is型癌 , pit pattern , 表面陥凹型腫瘍 pp.1461-1472
Published Date 1997/10/25
DOI https://doi.org/10.11477/mf.1403105223
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 Using endoscopic findings and hisologic features, we analyzed 95 protruded (type Is) cancers invading the submucosa. We also analysis the pit pattern in 81 of these lesions. According to endoscopic observasion and pit pattern, they were classified into two types: the depressed area (-) group (61 lesions, 75.2%) and the depressed area (+) group (20 lesions, 24.7%). The depressed area (+) group manifested type ⅢL and type Ⅳ pit pattern, but these manifestations were not present in the depressed area (+) group. The size of tumors which have a depressed area was significantly smaller than that of other tumors, but all of them in this study had invaded the submucosa to a massive degree. It was suggested that the tumors of the depressed (+) group were derived from depressed tumors because of their similarity in histologic features. They had also invaded the submucosa rapidly in their early phase of growth and were recognized as protruded tumors. For the sake of deciding the indication for endoscopic resection, it is obvious that it is significant to distinguish these two groups from each other.

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