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Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

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A spontaneous pneumothorax is the spontaneous occurrence of air or gas in the pleural space (1).

It is the most common form of pneumothorax and often occurs in young, thin men.

Spontaneous pneumothorax can be divided into:

  • primary spontaneous pneumothorax (PSP)
    • no predisposing lung disease or history of thoracic trauma
  • secondary spontaneous pneumothorax (SSP)
    • an underlying lung abnormality is present (1,2)


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