Coalescent B-Lines in a COVID-19 patient: Hyperechoic artifacts (horizontal arrows) arising from the pleural line (black arrows) and extending vertically (in regard to the screen) to the bottom of the image, moving with the cycle of respiration. Any horizontal artifacts below the pleura that are usually seen in the healthy lung and represent reverberations of the pleural line (A-Lines) are obliterated by B-Lines, and are absent here