Presents the results of a study on the association of backwash ileitis (BWI) with colorectal carcinoma (CRC) in ulcerative colitis. Evaluation of group 1 patients with pancolitis with BWI, group 2 patients with pancolitis without BWI and group 3 patients with left-sided colitis; Percentage of patients who were diagnosed with CRC; Comparison of the multiple tumor growth among the three groups.