What does a 30cm polyp in the colon look like?

A 30 cm polyp in the colon is exceptionally large and would appear as a significant growth protruding from the colonic wall. It may have a lobulated or irregular surface, and its color can vary from pink to reddish, sometimes with areas of ulceration or necrosis. Depending on its type, it could be sessile (flat) or pedunculated (attached by a stalk). Such a size would likely raise concerns for malignancy, and it would be a focal point of investigation during a colonoscopy.