PR MICHEL BRAUNER / ISM / SCIENCE PHOTO LIBRARY PR MICHEL BRAUNER / ISM / SCIENCE PHOTO LIBRARY
Pneumocystis pneumonia. Frontal chest X-ray of a male patient with pneumocystis pneumonia (PCP, or pneumocystosis). PCP is a form of pneumonia, caused by the yeast-like fungus Pneumocystis jirovecii (Pneumocystis carinii). Pneumonia is an inflammatory condition of the lung that primarily affects the microscopic air sacs known as alveoli.
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