The collection of air between the parietal and visceral pleurae.
Collapsed lung or pneumothorax can be caused either spontaneously or due to pathology. Causes of pneumothorax include injuries like knife wounds, fractured ribs, by a medical needle or by the damaging processes of disease like COPD, asthma, connective tissue disease, cystic fibrosis, and pneumonia.
Percussion of the thorax will produce hyperresonant note. Auscultation will reveal reduced breath sounds. Vocal fremitus will be decreased. There may also be crackles and wheezes.
(Full details and demonstration of procedures are provided with the DVD/videos and associated study material)