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Your report says chronic colitis. Colitis is inflammation of the large intestine, and when stated without "ulcerative colitis" they usually mean an infection. Saying "chronic colitis" together likely means an ongoing infection.
If you truly have ulcerative colitis then the biopsy results would show it when examined under a microscope. As, Ulcerative Colitis permanently changes the appearance of the cells within our large intestine and they are quite distinct on your biopsy slide. In a healthy person, the blood vessels in a biopsy appear in a very orderly pattern. In an Ulcerative Colitis patient, the blood vessel pattern is not orderly, rather it's very random and disorganized because of the repeated cycles of inflammation and healing changing its structure. The cells themselves look very unusual, they have thick cell walls, strange gaps between the cells, the insides of the cells are unusual. The surface of a normal large intestine is a pattern of hills and valleys when viewed under the microscope, the valleys are known as "crypts" in medical jargon. In Ulcerative Colitis patients have their crypts full of stuff that doesn't belong there (usually white blood cells), known as "crypt abscesses." We just look very weird under a microscope, even when we're in remission it can be seen.
"Hyperplastic polyposis is a rare syndrome characterized by the development of multiple colorectal serrated lesions, most often a mixture of hyperplastic polyps and flat serrated adenomas. Patients with hyperplastic polyposis syndrome (HPS) have a high lifetime risk of developing colorectal cancer (up to 50%). However, at colonoscopy the diagnosis is often missed because the flat lesions are not recognized or the endoscopist is simply unaware of this syndrome."
www.sciencedirect.com/science/article/pii/S2212097113701638