Fig 3. Two cases from the survivor and deceased cohorts illustrating progression of CT findings over time in COVID-19.

(A) Admission CT images of a 69-year-old male from the deceased cohort demonstrating mild bilateral peripheral ground-glass opacities on CT. Total CT severity score calculated at 9. (B) Follow-up CT images of the same patient 6 days later with severe worsening of disease manifesting as diffuse consolidative and ground-glass opacities. Total CT severity score calculated at 22. (C) Admission CT images of a 37-year-old male from the survivor cohort demonstrating multilobar ground-glass opacities. Total CT severity score calculated at 14. (D) Follow-up CT images of the same patient 6 days later with significant improvement of disease extent. Total Ct severity score calculated at 10.