Treatment consists of bronchoscopy rather than chest tube drainage. Radiographically,<unk>  is suggested when an atelectatic lobe or lung, particularly right upper lobe atelectasis, is surrounded by a focal<unk> .
Pneumothorax ex vacuo
Pulmonary hematoma
Hemothorax
Urinothorax
Diaphragmatic rupture
Pulmonary contusion
Chylothorax
Hydropneumothorax