Imaging related to underlying immunological and pathological processes in COVID-19

Figure 4 Imaging findings on conventional radiography range from normal findings to diffuse changes in the lung parenchyma. A: Posteroanterior (PA) chest X-ray 7 d after symptom onset. Predominantly peripheral ground glass opacities in both mid and lower zones of the lungs (white arrows); B: PA chest X-ray 11 d after symptom onset. Bilateral dense peripheral and basal air space consolidation (white arrows) more pronounced on the left and loss of lung markings in the mid and lower zones on the left; C: PA chest X-ray 3 d after symptom onset. Bilaterally, approximately proportionally in the middle and lower lung lobes, confluent ill-defined patchy opacities are visualized (white arrows). There is a relative preservation of the central areas of the lungs; D: PA chest X-ray 4 d after symptom onset. Bilaterally, predominantly in the right lower lobe, fine linear opacities (white arrows) are seen. Additionally, small patchy ground glass opacities (black arrow) are visualized in the peripheral region of right middle lobe.