Figure 1.

Chest CT scans of the 47-year-old man. A: consolidation of bilateral lower lungs and small bilateral pleural effusion (day 4 after admission); B: a thin-walled small cavity with ground glass exudation in the left lower lobe (day 15 after admission); C: two small nodules with cavities in the bilateral lower lungs (day 15 after admission); D: a thin-walled small cavity without ground glass exudation in the left lower lobe (day 20 after discharge).