Spontaneous Pneumothorax Ppt. A primary spontaneous pneumothorax (psp) occurs automatically without a known eliciting event, while a secondary spontaneous pneumothorax (ssp) occurs after an underlying pulmonary disease. Primary spontaneous pneumothorax (psp) no underlying lung disease.

Gas in the pleural space is termed a pneumothorax. Pneumothorax (collapsed lung) occurs when air accumulates in the pleural space.