Table 2. Lung ultrasound patterns and corresponding clinical interpretation.

Pattern	Image	Findings	Interpretation
A		Reverberation artefacts parallel to the pleural line (A-lines)	Expression of a physiologically aerated lung when accompanied by the sliding sign of the pleural layers, but could also be present in hyper-inflated regions—normal lung aeration
B1		Multiple vertical artefacts (B-lines)	Correlated to extra vascular lung water content, absent in normal lung, hallmark of the alveolo-interstitial syndrome—moderate loss of aeration
B2		Multiple, coalescent B-lines	Further progression of the B1 pattern—severe loss of aeration
C		Real image, not artefact with tissue-like echogenicity, or shred sign (typical of alveolar consolidation)	Visible when consolidations are extended to the pleura—collapsed or consolidated lung tissue