**5. Imaging findings**

#### **5.1 Chest radiographs**

Chest radiographs may be normal in early or mild disease. Common abnormal radiograph findings were consolidation and ground-glass opacities, with bilateral, peripheral, and lower lung zone distributions; lung involvement increased over the course of illness, with a peak in severity at 10 to 12 days after symptom onset.

Spontaneous pneumothorax has also been described, although it is relatively uncommon.
