Air trapping is often incidentally diagnosed on computed tomography (CT) scanning.
On expiratory films, retained hyperlucent gas will be visualised in cases of air trapping.
[2] Air trapping represents poorly aerated lung, but on its own is clinically benign.
On diving the lung volume collapses and pushes air into the poorly aerated regions.
On arising from a deep depth, these air-trapped areas of lung expand.