ANDRE LABBE, ISM / SCIENCE PHOTO LIBRARY ANDRE LABBE, ISM / SCIENCE PHOTO LIBRARY
Lobar pneumonia. Frontal X-ray of the lungs of a 2-year-old girl, showing lobar pneumonia of the upper and middle lobes of the left lung (upper right). Lobar pneumonia is a bacterial infection that causes inflammation of the lungs. The alveoli (the air sacs of the lungs) become blocked with pus and solidify. The solid areas are visible on X-rays. Symptoms are coughing and chest pain.
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