PMC8387596_01
Series of chest X-ray images of COVID-19 patient from case 1. The images are chronologically* arranged in a-z order (the letter mark is indicated in the lower right corner of each image) . *The dates of records are visible in the top right corner of each image.  Identifiable patient's data are covered.
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F1
Basic blood laboratory analysis and chest radiograph were performed (Figure 1A), none of which showed significant pathology (except for a slight increase in granulocytes regarding lab work). Bilateral pneumonia of lower lung fields was described by a radiologist (Figure 1B). Control chest radiogram showed progressive dynamic of bilateral pneumonia and discrete pleural effusion in the projection of the left lateral phrenicocostal sinus (Figure 1C), while CRP value was reduced to 6.5. Further, a control chest X-ray showed mild regressive dynamic of infiltrative inflammatory changes of lung parenchyma (Figure 1D). Approximately a month and a half later, the patient appeared at an appointment at specialists, and the control chest X-ray image was described as a normal finding by a radiologist, meaning that no scaring changes in terms of postinflammatory fibrosis were observed (Figure 1E).
PMC8387596_02
Series of chest X-ray images of COVID-19 patient from case 2. The images are chronologically* arranged in a-z order (the letter mark is indicated in the lower right corner of each image) . *The dates of records are visible in the top right corner of each image.  Identifiable patient's data are covered.
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F2
Equally important, an X-ray image of the chest was described as "extensive infiltrative changes of the lung parenchyma bilaterally" by a radiologist (Figure 2A). Later on, as part of the specialist's examination, new control chest X-ray imaging was performed and it was described as a "normal finding" by the radiologist, meaning that no previously described fibrose changes were now visible (Figure 2B).
PMC8387596_03
Series of chest X-ray images of COVID-19 patient from case 3. The images are chronologically* arranged in a-z order (the letter mark is indicated in the lower right corner of each image) . *The dates of records are visible in the top right corner of each image.  Identifiable patient's data are covered.
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F3
The laboratory analysis did not show any remarkably disturbed parameter, while the chest radiograph revealed a mildly more pronounced interstitial pattern basally and toward the periphery of lower lung fields (Figure 3A). The chest radiograph showed progressive dynamic of inflammatory changes (Figure 3B), while the blood count revealed slightly reduced total leucocytes and platelets and mildly elevated granulocytes. Control chest imaging was performed and it showed initial regressive dynamic of inflammatory changes (Figure 3C). Prior to specialist controls, the new chest radiograph was performed and it was described as "almost complete regression of the inflammatory changes of the lung parenchyma" by the radiologist (Figure 3D).