Clinical Presentation
Before and after placement of a left-sided thoracostomy tube in a patient with left-sided pneumothorax. The patient had left-sided chest pain for the previous 3 days.
Further Work-up

Imaging Findings

(A) Initial chest radiograph demonstrates a large left-sided pneumothorax (arrows). (B) After placement of a thoracostomy tube, radiograph shows significant re-expansion of the left lung with interval development of diff use parenchymal opacities in the same lung (asterisk).
Differential Diagnosis
• Re-expansion pulmonary edema (RPE):
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