Can chest computed tomography findings be compared between outpatient and hospitalized COVID‐19 patients?

We read with great interest the recently published study by Zarei et al. [1] that described the computed tomography (CT) findings in outpatients and hospitalized patients that tested positive for COVID-19 at RT-PCR in Shiraz. The Authors surely should be commended for theirefforts in evaluating chest CT findings of COVID-19 in a relevant sample of patients. However, some concerns could be raised, especially about the methods adopted in this cross-sectional study which, in our opinion, suggest taking with caution at least some of the conclusions drawn by the Authors. The role of chest CT as a fundamental diagnostic tool for the diagnosis of COVID-19 infection has been widely underlined by many studies [2]. Especially at the beginning of the pandemics, chest CT proved to be useful because of the typical signs of COVID-19 pneumonia that could be easily identified.