Sign
A-lines
Horizontal, evenly spaced lines seen below the pleural line on lung ultrasound, produced by reverberation at the pleural surface.
- Found
- Seen on lung ultrasound as horizontal lines that repeat below the pleural line at regular intervals.
- Normal
- The normal air-filled lung, where the lines are evenly spaced and the pleura slides beneath them.
- Abnormal
- The same horizontal pattern with lung sliding absent.
- Suggests
- Normal lung aeration, or pneumothorax when lung sliding is also lost.