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Colon cancer. Coloured composite computed tomography (CT) and positron emission tomography (PET) scans through the abdomen of a patient with sigmoid colon cancer. The tumour is at bottom centre (pink), the pink structure above it is the bladder. The sigmoid colon is at the end of the colon and start of the rectum. Symptoms of colon cancer include rectal bleeding and abdominal pain. Treatment is with surgery to remove the affected area. Colon cancer is one of the most common cancers in the Western world. It is a disease of late and middle age. Risk factors include a diet high in animal fat and low in fibre and a sedentary lifestyle.
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