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(A) Longitudinal scan of anterior chest wall showing 3 “B-lines”: comet-tail artifacts, always arising from the pleural line, and always moving in synchrony with lung-sliding. They are almost always long, well-defined, laser-like, hyperechoic, erasing A-lines, and are considered significant when ≥3. Few B-lines may be normally seen in basal lung zones. (B) Cine US clip demonstrating the same (Supplementary Material 3).
