随着时间的推移，溃疡性结肠炎病人有患腺癌的危险。左侧可见很多正常腺体，但是右侧腺体明显异常，是第一个恶变的标志。
Over time, there is a risk for adenocarcinoma with ulcerative colitis. Here, more normal glands are seen at the left, but the glands at the right demonstrate dysplasia, the first indication that there is a move towards neoplasia.
