ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Rectal cancer. Magnetic resonance imaging (MRI) scans of the pelvis of a 65 year old patient with a malignant (cancerous) tumour (white) in the rectum, the last part of the large intestine. Colorectal cancer is the third most common form of cancer, and the second most common cause of cancer deaths in the western world.
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