Rectal cancer, endoscope view. Rectal cancer (adenocarcinoma) causing a severe obstruction of the bowel. Adenocarcinoma is a cancer of the glandular lining that is found in many different organs, including the digestive tract. Rectal cancer is similar to colon cancer, and is often named colorectal cancer. Colon cancer is one of the most common cancers in North America and Western Europe. It is thought to be connected to a diet high in fat and low in fibre.
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