Endoscopic Ultrasonography in the Diagnosis of Early Colorectal Cancer Invasion Masafumi Nomura 1 , Tokuma Tanuma 1 , Taku Harada 1 , Shinji Urade 1 , Itaru Yamamoto 1 , Hideaki Koga 1 , Yushi Kimura 1 , Hiroyuki Maguchi 1 , Yuko Omori 2 , Hiroko Noguchi 2 , Toshiya Shinohara 2 1Center for Gastroenterology, Teine-Keijinkai Hospital, Sapporo, Japan 2Department of Pathology, Teine-Keijinkai Hospital, Sapporo, Japan Keyword: 早期大腸癌 , 深達度診断 , EUS , 細径プローブ pp.693-702
Published Date 2015/5/24
DOI https://doi.org/10.11477/mf.1403200297
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 EUS(Endoscopic ultrasonography)is a method used to directly observe lesions in vertical cross sections, allowing for an objective evaluation of the depth of cancer invasion. Each lesion evaluated by EUS has already been diagnosed by colonoscopy ; thus, EUS usually serves to corroborate such diagnoses. The most important task when diagnosing the depth of invasion of early-stage colorectal cancer is to determine whether the lesion can be endoscopically resected. Although determining whether the lesion has a submucosal invasion depth exceeding 1,000μm would be ideal, visualization of the muscularis mucosae(which serves as a reference to distinguish between the mucosa and the submucosa)is often not possible. Therefore, lesions are diagnosed either as cancer confined to the mucosa or slightly invading into the submucosa, or as cancer with massive invasion into the submucosa. If it is not possible to determine whether the cancerous lesion is massively invading into the submucosa, endoscopic resection is performed and additional treatment is decided based on the pathological results. The EUS findings are significant because they can determine whether the outer surface of the submucosa can be preserved.

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