Radiographic Diagnosis of Laterally Spreading Tumors of the Colorectum Masafumi Nomura 1 , Shinya Mitsui 1 , Hayato Shida 1 , Hironori Aoki 1 , Shin Kato 1 , Masabumi Kaneko 1 , Toshiya Shinohara 2 , Hiroyuki Maguchi 1 1Center for Gastroenterology, Teine-Keijinkai Hospital, Sapporo, Japan 2Department of Pathology, Teine-Keijinkai Hospital, Sapporo, Japan Keyword: 側方発育型大腸腫瘍 , LST , 注腸X線検査 , 深達度診断 , 側面変形 pp.953-958
Published Date 2010/5/25
DOI https://doi.org/10.11477/mf.1403101953
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 Among colorectal neoplasms, there is a certain group that is likely to extend laterally rather than vertically along the colonic wall. This group of lesions is defined as laterally spreading tumor(LST). LST is classified into granular type and non-granular type. The former is further divided into two groups : homogeneous type and mixed nodular type. The latter is divided into two more groups : flat elevated type and pseudo-depressed type. Radiographic detection on the surface depression is hard, so it is difficult with barium enema to distinguish between the flat elevated type and the pseudo-depressed type. Though lateral view findings are useful for estimation of the invasion depth of colorectal carcinomas, some LST cases do not have lateral views and some LSTs within the mucosal layer indicate radiographic deformities in the lateral view findings. Comprehensive diagnosis including endoscopic and ultrasound findings is important for the diagnosis of the invasion depth of LSTs.

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