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This article is made available via the PMC Open Access Subset for unrestricted re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the COVID-19 pandemic or until permissions are revoked in writing. Upon expiration of these permissions, PMC is granted a perpetual license to make this article available via PMC and Europe PMC, consistent with existing copyright protections.
Figure 2.
Ground-glass areas in COVID-19 pneumonia (Figure 2a) in a patient with ankylosing spondylitis and preexisting fibrosing nonspecific interstitial pneumonia (Figure 2b).