Japanese

Histopathological Examination of Superficial Spreading Type of Colorectal Epithelial Tumor Yasuo Ohkura 1 1Department of Pathology, Tokyo Metropolitan Cancer Detection Center Keyword: 表層拡大型大腸腫瘍 pp.143-152
Published Date 1996/2/25
DOI https://doi.org/10.11477/mf.1403103932
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 Superficial spreading type of colorectal epithelial tumors sometimes seemed the same as tumors of the esophagus and stomach. But the nature of these colorectal tumors was not defined. Fifty-two cases of spreading type colorectal tumors more than 3 cm in maximum diameter found in Tokyo Metropolitan Cancer Detection Center and Tama Cancer Detection Center were examined histopathologically. Invasion depth of the tumors showed that one case was a villotubular adenoma,31 cases were mucosal carcinoma,17 cases were submucosal invasive tumors,2 cases were propria muscle invasive, and 2 cases were subserosal invasive. In the examination, the tumors were divided into four groups, of which A group was more than 3 cm in maximum diameter,B group was more than 3 cm in minimum diameter,C group was more than 5 cm in maximum diameter, and D group was more than 5 cm in minimum diameter. The number of cases of each groups were 52,29,20 and 6 respectively.

 From macroscopical examination in all cases of A group, the common features of superficial spreading type of colorectal tumors were not revealed, but histological examination showed widely spread atypical glands in the upper portion of the mucosa. Similar findings were revealed in B and C group. In D group, several common features were found. They were 1) most of the tumors were mucosal carcinoma, 2) main macroscopic figure was superficially elevated type (Ⅱa type), 3) macroscopical appearance was mainly granular colonic area, 4) histopathogically, well differentiated carcinoma, mainly tubular type.

 It was thought that, as in the case of esophageal cancers it is necessary to define the height of these tumors. However, as the size of the cancers was not able to be assessed objectively, we defined superficial spreading type of colorectal epithelial tumors as being at least more than 5 cm in minimum diameter.

 According to this definition, such tumor cases were relatively few in number. Nevertheless, we considered it as suitable for revealing the most histopathological features of superficial spreading type of colorected epithelial tumor.


Copyright © 1996, 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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