[Colo-rectal precancerous conditions: anatomo-pathologic and clinical aspects].

The authors, after emphasizing the value presently ascribed to the conception of "epithelial displasia" as initial histologic and cytologic alteration, common to all groups of patients with high risk of development of colorectal cancer, review the mani precancer lesions of large intestine. As a conclusion, they affirm the main target one presently aims at for the screening in groups with high risk is to precociously identify the stage of transformation of epithelial displasia into carcinoma, so as to be able to set up a timely treatment.