K H FUNG / SCIENCE PHOTO LIBRARY K H FUNG / SCIENCE PHOTO LIBRARY
Lung cancer. Coloured 3D axial computed tomography (CT) scan of human lungs at the level of the heart, seen from above with a cancer (red, lower left) in the left lung. The tumour is attached to the pleura, the membranes surrounding the lungs. The heart is at upper centre and the spine is at lower centre. 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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