Ulcerative colitis is defined as a chronic ulcerative process of unknown origin in the large intestine. It has been questioned whether ulcerative proctitis always represents an early stage of ulcerative colitis or whether it is a disease sui generis. In our material most patients who initially had only rectal involvement later developed colitis. There are some patients in whom the pathological changes remain limited to the rectum. The long-term prognosis for these cases is much more favourable than that for the cases with colitis (1).
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