SCOTT CAMAZINE / SCIENCE PHOTO LIBRARY SCOTT CAMAZINE / SCIENCE PHOTO LIBRARY
Lung cancer. Coloured computed tomography (CT) scan through the chest of a 59-year-old man with a lung cancer (red, centre left) in his right lung. The lungs are the two white areas either side of the heart (red, centre). The aortic arch (black) is seen between the heart and the left lung. The spine (bottom), sternum (top) and the circling ribs are all black with other body tissues blue. Lung cancers are most often caused by cigarette smoking, exposure to asbestos, and pollution. Treatment includes radiotherapy, chemotherapy, and the surgical removal of all or part of the affected lung. CT scanning uses X-rays to obtain slice images of internal body organs.
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