<unk>  is a rare type of<unk>  which forms adjacent to an atelectatic lobe. It is seen preferentially with atelectasis of the right upper lobe and is the result of rapid atelectasis producing an abrupt decrease in the intrapleural pressure with subsequent release of nitrogen from pleural capillaries.
Pneumothorax ex vacuo
Pulmonary hematoma
Hemothorax
Urinothorax
Diaphragmatic rupture
Pulmonary contusion
Chylothorax
Hydropneumothorax