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. 2021 Jun 17;8:689568. doi: 10.3389/fmed.2021.689568

Figure 4.

Figure 4

Dynamic changes in lung lesions in two representative cases with COVID-19 pneumonia. A 65-year-old man: (A) scan obtained on day 2; multiple patchy GGOs were shown in the middle lobe and both lower lobes; the PPV, PGV, and PCV were 1.14, 1.07, and 0.07%, respectively. (B) Scan obtained on day 7 showed extensive GGOs with consolidation and crazy-paving pattern in the both lower lobes; the PPV, PGV, and PCV increased to 14.24, 11.38, and 2.86%, respectively. (C) Scan obtained on day 21 showed obvious absorption of abnormalities with fibrotic-like appearances; the PPV, PGV, and PCV were 7.73, 7.12, and 0.61%, respectively. A 67-year-old woman: (D) Scan obtained on day 2, small nodule of GGO was shown in the right lung; the PPV, PGV, and PCV were 0.19, 0.16, and 0.03%, respectively. (E) Scan obtained on day 10 showed extensive GGOs in both lungs with consolidation in the lower lobes; the PPV, PGV, and PCV increased to 48.67, 38.23, and 10.44, respectively. (F) Scan obtained on day 56 showed obvious absorption of GGOs and consolidation with fibrotic-like appearances; the PPV, PGV, and PCV were 39.47, 33.77, and 5.70%, respectively.