Pneumothorax is a collection of free air in the pleural cavity with resultant pulmonary collapse. Spontaneous pneumothorax is divided into two types according to the presence or absence of an underlying disease. If there is not an underlying disease, it is called "primary spontaneous pneumothorax" (PSP). If there is another underlying lung disease (e.g. COPD, tuberculosis), it is called "secondary spontaneous pneumothorax" (SSP). The various methods of simple observation, aspiration, tube thoracostomy, pleu