CTICasesBilateral Anterior Pneumothoraces simulating Anterior Junction Line
Imaging findings
Chest radiograph demonstrates a prominent, thickened vertical line in the upper mediastinum mimicking a thickened anterior junction line, shown on CT to represent the apposition of bilateral anterior pleural gas collections (pneumothoraces) in the supine position.
Key takeaways
In supine patients, pleural air accumulates anteriorly and medially. Bilateral anterior pneumothoraces can abut at the midline, simulating a thickened anterior junction line. Recognizing this sign is critical as it indicates bilateral pneumothoraces that may require bilateral drainage.
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