Radiographic and Endoscopic Diagnosis of the Depth of Invasion of Early Colorectal Cancer Toshio Hoashi 1,2 , Tsuneyoshi Yao 1 , Tadahiko Fuchigami 3 1Department of Gastroenterology, Fukuoka University Chikushi Hospital 2Department of Pathology, Fukuoka University Chikushi Hospital 3Department of Gastroenterology, Matsuyama Red Cross Hospital Keyword: 伸展不良所見 , 早期大腸癌 , 弧の硬化像 , 画然とした硬化像 , 深達度診断 pp.1651-1662
Published Date 1997/11/25
DOI https://doi.org/10.11477/mf.1403105256
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 The aim of the present study was the radiographic and endoscopic diagnosis of the depth of submucosal invasion in early colorectal cancer (mucosal and submucosal invasion). The depth of invasion was classified by histological examination as follows; A group (m and sm1 invasion) and B group (sm2, and sm3 invasion).

 The following four radiographic features (distinct rigidity of the colorectal wall, radiolucency around the tumor, mucosal convergence, central depression), and 10 endoscopic features (rigidity of an arc in the lumen, submucosal elevation around the tumor, mucosal convergence, ulcer or erosion, central depression, tense impression, redness, white spots, irregularity, disappearance of gloss) and tumor size were assessed and comparison was made between the A and B group.

 In the IIa type, the most significant feature was an impression of tenseness. But in other types of early colorectal cancer, the rigidity of an arc in the lumen was the most significant feature. It is concluded that the depth of cancer invasion, if divided into A and B group, will be able to be diagnosed endoscopically and radiographically.

 Technically, it is very important to obtain an adequate picture which can show the characteristics of regular features regularities. The lesion should be visualized with both an adequate volume of air and with control of perstalsis. It is important to visualize with a lateral view, radiographically, and with a distant view, endoscopically.

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