Count of B-lines: A Matter with Persistent Limitations

To the Editor: After reading the interesting review by Gutierrez, et al 1, entitled “Ultrasound in the assessment of interstitial lung disease in systemic sclerosis. A systematic literature review by the OMERACT Ultrasound Group,” we must take issue with some of the statements published. The authors state that “B-lines consist of ‘comet tails’… generated by the reflection of the [lung] US beam from thickened subpleural interlobar septa.”...