Differential diagnosis, investigations and treatment
The COVID-19 patients were diagnosed using polymerase chain reaction
(PCR) test or quantitative antigen test. All patients underwent computed
tomography (CT) at admission and on demand by the physicians. The
medications for pneumonia included dexamethasone, remdesivir, and
favipiravir. We used nasal cannula, oxygen mask, and high-flow nasal
cannula (HFNC), but did not use ventilator or noninvasive positive
pressure ventilation (NPPV). The diagnosis of pneumothorax was made
using chest radiography (Figure 1) or CT (Figure 2). The requirement for
obtaining informed consent from patients was waived due to the
retrospective nature of the study. Patients were allowed to withdraw
from the study at any time.