Early Gastric Carcinoma, Type Ⅱb: A CIinicopathologic Analysis Kenjiro Nakamura 1 1The Second Department of Pathology, Faculty of Medicine, Kyushu University pp.363-370
Published Date 1986/4/25
DOI https://doi.org/10.11477/mf.1403110224
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 Of the 2,021 lesions of early gastric carcinomas in 1,857 patients, 17 lesions of the type Ⅱb were selected for the study. These lesions showed neither protrusion nor depression at the level of the surrounding non-cancerous mucosa, presenting no distinct margins, Among these, 13 were classified as differentiated type carcinoma and the remainlng 4 as undifferentiated type, 15 as intramucosal carcinomas and 2 as carcinomas with minute submucosal invasion. The mucosal layer was replaced by the malignant tissue only in the upper portion in 10 (59%) (superficial type) and in all the layer in 7 (41%) (full thickness type). The marginal portions of the lesions were infiltrative in 11 (65%) and expansive in 6 (35%). Undifferentiated type carcinomas always had infiltrative margins, although differentiated ones were either infiltrative o expansive in the manner of growthr. Unlike the types Ⅱa (elevated) and Ⅱc (depressed), the type Ⅱb had the tendency to spread superficially and/or infiltratively in the lamina propria mucosae. A smaller proportion of the type Ⅱb tended to grow with low grade of structural atypia, giving no recognizable alteration in the mucosal level.

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