Assertion: spontaneous pneumothorax | /r/DefinedAs | sp
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text: More specifically, primary spontaneous pneumothorax (PSP) is defined as the spontaneously occurring presence of air in the pleural space in patients without clinically apparent underlying lung disease, whereas a secondary spontaneous pneumothorax (SSP) is defined as a SP with underlying lung disease (12) including cystic fibrosis, chronic obstructive pulmonary disease (COPD), AIDS, etc.