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letter
. 2020 Apr 18;75(7):553–554. doi: 10.1016/j.crad.2020.04.003

Table 1.

Timeline of common findings of COVID-19 in computed tomography (CT) and ultrasound.1,3, 4, 5, 6, 7, 8, 9

Symptom onset (days) CT Ultrasound
0–3 Single or multiple scattered and patchy GGO, patchy grid-like thickness of interlobular septa Unilateral or bilateral focal B-lines
3–7 Fused and large-scale consolidation with internal air bronchograms, crazy-paving pattern, multi-lobe GGO Bilateral diffuse B-lines with irregular pleural line and punctate defects, subpleural consolidations, air bronchograms
7–14 Multiple patchy consolidations that are reduced in size and density, crazy-paving pattern
14–21 Reduced patchy consolidations, strip-like opacities, grid-like thickening of interlobular septum, minimal crazy paving Resolving consolidations, A-lines

GGO, ground-glass opacity.