Supine pneumothorax
Discussion:
- pneumothoraces on supine chest radiographs ("supine pneumothorax") can be very difficult to pick and often associated factors such as rib fracture and subcutaneous emphysema help raise the suspicion of otherwise equivocal findings
- up to 30% of supine pneumothoraces will be missed
- air collecting in the anteromedial pleural space (as in this case) is the most common location and can result in a dark lucent band that will crisply outline the right heart border and/or right hemidiaphragm
- CT will clearly show a supine pneumothorax
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