Q: What is Pneumothorax ex vacuo?
Answer: Pneumothorax ex vacuo can be called a misnomer. It is formed when after thoracentesis the lung stays trapped due to thick fibrous pleural rind, cannot expand, and air filled the space. The exacerbating factor in this phenomenon is the negative pleural pressure created during the procedure. This may pull the air through the track formed by the catheter. Thick fibrous pleural rind may formed due to chronic underlying disease such as atelectasis, bronchial obstruction, an inflammatory or malignant process.
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References:
1. Woodring JH, Baker MD, Stark P. Pneumothorax ex vacuo. Chest 1996; 110:1102.
2. Byrd RP Jr, Roy TM. Pneumothorax ex vacuo. Chest. 1997 Jul;112(1):293-4. doi: 10.1378/chest.112.1.293-a.
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