Because they can: Large polyps are more common, without symptoms, if they are on right side of colon, where stool is liquid, and bowel is bigger, more elastic. Not all large polyps are cancerous. Size within the bowel cavity (lumen) of a cancerous polyp is less important than depth of involvement into bowel wall. Bulky, but superficial tumors can be cured with surgery alone.
Answered 10/4/2016
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