K H FUNG / SCIENCE PHOTO LIBRARY K H FUNG / SCIENCE PHOTO LIBRARY
Lung cancer. Coloured 3D axial computed tomography (CT) scan of human lungs seen from above with a cancer (blue, far left) in the upper lobe of the left lung. Also seen here is collapse of the surrounding lung area, and pleural adhesions. 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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