CT Colonography : Screening and Staging for Colorectal Carcinoma Koichi Koizumi 1 , Toshihiro Ogura 2 1Department of Internal Medicine, Cancer Institute Hospital 2Department of Radiology, Cancer Institute Hospital Keyword: 大腸癌 , 大腸ポリープ , CT , 診断 pp.1395-1402
Published Date 2002/10/25
DOI https://doi.org/10.11477/mf.1403104566
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 Recently, CT colonography (Virtual colonoscopy method) has become one of the useful procedures for colorectal imaging. Though it is possible to visualize exophytic polyps and carcinomas, it is important also to be able to visualize flat lesions. In this study, 61.5% of the flat lesions are visualized retrospectively.

 Concerning the staging of colorectal cancer, to diagnose the invasive depth is important for determining a therapeutic procedure. It is especially important to diagnose massive submucosal invasive (sm2・3) carcinomas. To diagnose indentation in the profile image of a lesion, double-contrast CT colonography (DCCT), which is similar to a double-contrast barium enema study, shows 89.3% accuracy for diagnosis of massive submucosal invasion.

 In addition, CT colonography by multiplanar-reconstruction image or maximum-intensity-projection image can diagnose lymph node metatasis more clearly at one scanning. CT colonograph might be a useful procedure for screening and staging for colorectal carcinoma.

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