During screening of colorectal carcinoma by the test of occult haemorrhage in 1985 to 1989 in the Bruntál district during coloscopic examination of positive subjects a total of 277 adenomatous polyps of the large intestine were revealed. Adenomatous polyps were detected in 227 patients where by in 180 solitary polyps were involved and in 47 cases synchronous polyps. 222 adenomatous polyps were in the rectum and left half of the colon (80.1%). Histological examination revealed: tubular adenoma 153 cases (55.23%), tubovillous adenoma 92 cases (33.21%), villous adenoma 13 cases (4.69%), adenoma with intramucous carcinoma 12 cases (4.43%) and adenoma with invasive carcinoma 7 cases (2.53%).