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A pneumothorax is an accumulation of air in the pleural space. Often spontaneous
due to rupture of a pleural bleb. Other causes are trauma - also iatrogen
CVC lines, asthma, TB, pneumonia and others. Pneumothorax
will show as an area devoid of lung.
Pay attention tension pneumothorax. A tension pneumothorax results from leaking
air into the pleural space on inspiration - but on expiration the leakage
is closed by tissue or anything else. So the pressure in the pleural space
increases on insparation - a clinical emergency. As the pressure in the pleural
space arises, the surrounding structures, such as mediastinum, and heart can
be displaced.