ALAIN POL, ISM / SCIENCE PHOTO LIBRARY ALAIN POL, ISM / SCIENCE PHOTO LIBRARY
False-colour chest X-ray of a person suffering from silicosis, a lung disease (one of a group known as the pneumoconioses) that is caused by inhaling silica dust particles. The presence of silica stimulates fibrosis of lung tissue which results in breathlessness & an increased susceptibility to tuberculosis. In this image, fibrosis is represented by the patchy yellow areas over the reduced, blue lung fields. A comparable normal lung would have larger & better defined blue areas. Workers in the mineral mining, quarrying, stone-dressing, sandblasting and boiler-scaling industries are prone to the disease.
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