ANDRE LABBE, ISM / SCIENCE PHOTO LIBRARY ANDRE LABBE, ISM / SCIENCE PHOTO LIBRARY
Pleurisy. Frontal X-ray of the lungs of a 6-year-old boy, showing inflammation of the membranes (pleurae) that surround the lungs, a condition known as pleurisy. The right lung is affected here (at left). Pleurisy can be caused by various conditions, but viral infections are the most common.
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