MICHEL BRAUNER, ISM / SCIENCE PHOTO LIBRARY MICHEL BRAUNER, ISM / SCIENCE PHOTO LIBRARY
Bacterial pneumonia. Frontal X-ray of the lungs of a 53-year-old man, showing a partial lesion of the upper lobe of the right lung (upper left) due to bacterial pneumonia. This 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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