Fig. 2

Chest CT findings. The lesions (indicated by red arrow) of CT scan detected on day 3 after symptom onset (a). Axial images showed bilateral ground-glass opacity and consolidation on day 9 (b) and the larger area of lesions were observed on day 10 (c). CT scan on day 17 showed significant improvement of lesions before the first discharge (d), and on day 27 at relapse showed consolidation with higher density (e). The sixth and seventh follow-up CT scans demonstrated increased lesions on day 32 (f) and subsequent reduction of damaged area on day 44 (g), respectively