Polyps in large bowel grow for many years before they become cancer. How big a polyp can grow before it becomes a colon cancer? Is it important to remove all polyps found during colonoscopy? How CT colonography can identify important polyps in large bowel? Leading virtual colonoscopy screening expert discusses CT colonography (virtual colonoscopy)
Precancerous colon polyps – flat adenoma polyp. How big a colon polyp can grow before becoming a cancer threat? What is “flat adenoma”? Virtual colonoscopy (CT Colonography)can detect more rare large bowel and rectal lesions. Flat adenoma and serrated adenoma are two precancerous lesions in large bowel. Smaller than 5 millimeter polyps have basically zero chance of being colorectal cancer. Virtual colonoscopy is very good at detecting those polyps that have a chance to be early colorectal cancer or precancerous lesions. large polyps 10 millimeters or one centimeter and larger are important in screening for colorectal cancer. 6 to 9 mm polyps are in a grey zone for colon cancer risk. 6 to 9 mm polyps are more common than large polyps. both regular optical colonoscopy and CT colonography can detect flat polyps (flat adenomas) fairly well.