Definitions 162
Primary spontaneous pneumothorax (PSP) 162
Secondary spontaneous pneumothorax (SSP) 162
Acute presentation 163
Tension pneumothorax 164
Investigations 165
Management 166
Complications 167
Pneumothorax is defined as air in the pleural space. It may occur as a result of trauma or spontaneously, in which case it is further subdivided into primary and secondary. The treatment, response to therapy, and prognosis in these two groups is quite different, and establishing the category is essential....