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B-lines: vertical hyperechoic artifacts, extending from the pleura that erase normal A-lines (horizontal hyperechoic artifacts). They are the sign of increased interstitial fluid content and thickening of interlobular septae. (A) Deep B-lines, (B) short B-lines, (C) compact B-lines: the number of these artifacts is proportional to the decrease in air content with a tendency to confluence in severe alveolar–interstitial syndrome.
