Staphylococcal pneumonia and pneumothorax. Computed axial tomography (CT) scan showing a section through the lungs of a 62-year-old patient with pneumonia contracted in hospital. Multiple pulmonary abscesses are present in both lungs, and a significant pneumothorax, a large pocket of air (black, upper right), has expanded the pleural cavity and compressed the patient's left lung. In bacterial pneumonia, the pathogen is inhaled into the lung segments, or lobes, where it causes the alveoli (air sacs) to become blocked with pus. Treatment is with antibiotics. Surgical insertion of a chest tube is used to drain the air from a pneumothorax.
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