EVAN OTO / SCIENCE PHOTO LIBRARY EVAN OTO / SCIENCE PHOTO LIBRARY
An illustration of different stages of ulcerative colitis, an inflammatory bowel disease affecting the inner lining of the large intestine. The disease is characterized by the development of ulcers which begin damaging the mucosal lining, causing inflammation and progressive loss of blood. Severe cases may progress into the growth of pseudopolyps, and patients become more at risk of developing colorectal cancer.
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