Figure 3.

Images demonstrating the main changes on LUS in COVID-19 patients (the elements of A-BBC score). I–score 0 (class A): normal pleural line, 1 B-line, presence of A-lines; II–score 1 (class B1); normal pleural line, >3 B-lines; III - score 2 (class B2): multiple B-lines (“waterfall” sign), pleural involvement (“p”); IV - score 3 (class C): subpleural involvement (consolidation) and disruption of pleural line; V–Z-lines: vertical, wider lines, less ecogenic than the pleural line, without clinical significance