K H FUNG / SCIENCE PHOTO LIBRARY K H FUNG / SCIENCE PHOTO LIBRARY
Lung cancer. Coloured 3D frontal computed tomography (CT) scan of human lungs with a cancer (blue, upper right) in the upper lobe of the left lung. Cancer cells divide in an uncontrolled fashion and migrate to invade other tissues. Treatment is with surgery if the cancer is still localised, and chemotherapy and radiotherapy if it has spread.
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