SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY
Lung cancer. Coloured axial positron electron tomography (PET) scan of lung cancer (white, lower left) in the right lung. Lung cancers are most often caused by cigarette smoking, exposure to asbestos, or other forms of pollution. Treatment includes radiotherapy, chemotherapy and the surgical removal of all or part of the affected lung.
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