The author had an opportunity to study 480 cases with chief complaints of various gastrointestinal symptoms who subsequently underwent to 60cm flexible sigmoidofiberscope examination during the period June 1983 to July 1984 at Department of Internal Medicine, School of Medicine, Yeung-Nam University and the following results were obtained. 1) The incidence of lesions through endoscopy were following that, 48 patients (10%) had colonic polyps, 13 patients (2.7%) had ulcerating cancers among 480, the ratio of male and female was 59:41, the most common range of age was sixth decade, 27.9% of 61 cases (17 cases) and above fifth decade was 86.9% (43 cases). 2) Analysis of histopathological finding revealed that the most common polyps were adenoma, 40% of 42 cases (17 cases), the most common size was less than 1cm of 48 cases(38 cases) and synchronous polyps were 21% of 48 cases (10 cases). 3) The size of malignant changed polyps was l. 5cm and 2cm respectively in 2 cases 4) The seven cases among present series were found at above 25cm from conventional 25cm rigid sigmoidoscopy is not being reached.