From what I've found online - "A person who has an adenomatous polyp has a high risk of developing additional polyps. Almost 20% of patients will have more than one polyp at the same time. Therefore, when a polyp is found, it is important to check the entire colon for additional polyps. Once removed, a polyp does not grow back; however, new polyps can develop. Over 30% of people with adenomatous polyps will develop new polyps within two years."
Perhaps it was a new polyp that returned. I'm hoping any biopsy that was done found them to be benign. It sounds like you should have a colonoscopy to check the entire large bowel.
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