DR. E. WALKER / SCIENCE PHOTO LIBRARY DR. E. WALKER / SCIENCE PHOTO LIBRARY
Colorectal cancer. Transverse section through a gross specimen of the large intestine with a malignant (cancerous) tumour (centre). This is a carcinoma, a cancer that arises from the lining of an organ. Colorectal 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. Symptoms include rectal bleeding and abdominal pain. Treatment is with surgery to remove the affected area.
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