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# PLEURA ## I PNEUMOTHORAX **A. Accumulation of air in the pleural space** **B. Spontaneous pneumothorax** is due to rupture of an emphysematous bleb; seen in young adults. 1. Results in collapse of a portion of the lung (Fig. 9.24); trachea shifts to the side of collapse. **C. Tension pneumoth...

# PLEURA ## I PNEUMOTHORAX **A. Accumulation of air in the pleural space** **B. Spontaneous pneumothorax** is due to rupture of an emphysematous bleb; seen in young adults. 1. Results in collapse of a portion of the lung (Fig. 9.24); trachea shifts to the side of collapse. **C. Tension pneumothorax** arises with penetrating chest wall injury. 1. Air enters the pleural space, but cannot exit; trachea is pushed opposite to the side of injury. 2. Medical emergency; treated with insertion of a chest tube ## I MESOTHELIOMA **A. Malignant neoplasm of mesothelial cells;** highly associated with occupational exposure to asbestos **B. Presents with recurrent pleural effusions, dyspnea, and chest pain;** tumor encases the lung (Fig. 9.25).