CTICasesPneumothorax ex vacuo secondary to carcinoid obstruction
Imaging findings
CT and radiographs show chronic right upper lobe collapse due to an obstructing endobronchial carcinoid, complicated by a persistent, localized right pneumothorax that did not respond to chest tube placement.
Key takeaways
Pneumothorax ex vacuo is a rare complication of chronic lobar collapse. Rapid collapse of a lobe creates negative intrapleural pressure, drawing air into the pleural space. It is a mechanical phenomenon that does not require pleural intervention.
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