[Morphological characteristics of multiple polyps of the large intestine].

Morphologic characteristics of multiple colonic polyps from 155 patients were analysed. In 23.5% of cases the polyps were proximally localized. The histologic structure in 98.1% out of 316 polyps showed them to be adenomas with different atypical changes of the epithelium, including carcinoma in situ, or invasive cancer. With the increase in adenoma size its histologic structure became more complicated and atypical changes more prominent. Different forms of colonic mucosa multiple adenoma are reviewed, the incidence of malignancy being 11.6%. It is concluded, that thorough examination of the colon and active surgery is indicated in this group of patients.