Sign
B-lines
Vertical lines that rise from the pleural line to the bottom of a lung ultrasound image, caused by fluid in the subpleural interstitium.
- Found
- Seen on lung ultrasound as vertical lines that arise from the pleural line and reach the bottom of the screen.
- Normal
- None, or at most a few isolated lines, in healthy aerated lung.
- Abnormal
- Several lines in one intercostal space, or confluent lines that merge into a white lung.
- Suggests
- Fluid in the interstitium or alveoli, as in respiratory distress syndrome.