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P266. Chronic inflammatory bowel disorders diagnosed by screening colonoscopy for health check-up

N. Inoue, Y. Iwao, J. Matsuzaki, N. Takada, E. Shiomi, R. Shimizu, T. Yoshida, M. Takayama, Y. Sugino, Keio University School of Medicine, Center for Preventive Medicine, Tokyo, Japan


Colonoscopy is performed for screening of colon cancer early detection, but asymptomatic inflammatory bowel disorders are occasionally found upon screening colonoscopy. With recent increase in the number of patients with inflammatory bowel disease in Japan, the opportunity that chronic inflammatory bowel diseases such as ulcerative colitis (UC) are found by screening colonoscopy for health check-up is expected to increase. Here, we analysed the cases of asymptomatic inflammatory bowel disorders diagnosed upon colonoscopy for health check-up.


Among 669 subjects who voluntarily took screening colonoscopy (screening CS group) and 120 subjects who took colonoscopy because of positive immunological fecal occult blood test (positive FOBT group) between August 2012 and October 2013 at our institute, those endoscopically diagnosed as chronic inflammatory bowel diseases were analysed for clinical characteristics, endoscopic findings, course and treatment.


In screening CS group, 5 subjects (0.8%) were diagnosed as UC. Among these, 3 subjects were during treatment, one had already been diagnosed as UC and the remaining one was diagnosed as UC for the first time. In positive FOBT group, 4 subjects (3.3%) were diagnosed as UC. Among these, one was during treatment and the remaining three was pointed out UC for the first time. In addition, two subjects were revealed to have amoebic colitis and one was suspected to have peridiverticulitis in this group. Most of these subjects with chronic inflammatory bowel disorders had symptomatic bloody stool through detailed history taking, however, three subjects were symptomatic at all. In UC subjects, the endoscopic activity was mild except one whose activity was moderate.


It was not uncommon that chronic inflammatory bowel disorders such as UC and amoebic colitis were found in screening colonoscopy for health check-up. Although medical treatment is not necessary for all of these subjects, it is considered that they are needed to be carefully followed-up.