The acute course of coronavirus disease 2019 (COVID-19) is variable and ranges
from asymptomatic infection to fulminant respiratory failure. Patients
recovering from COVID-19 can have persistent symptoms and computed tomography
(CT) abnormalities of variable severity. At 3 months after acute infection, a
subset of patients will have CT abnormalities that include ground glass
abnormalities (GGO) and subpleural bands with concomitant pulmonary function
abnormalities. At 6 months after acute infection, some patients have persistent
CT changes to include the resolution of GGOs seen in the early recovery phase
and the persistence or development of changes suggestive of fibrosis such as
reticulation with or without parenchymal distortion. Predictors of post-COVID
lung disease include need for intensive care unit (ICU) admission, mechanical
ventilation, higher inflammatory markers, longer hospital stay and a diagnosis
of acute respiratory distress syndrome (ARDS). Treatments of post-COVID lung
disease are being investigated with anti-fibrotic agents being investigated for
the prevention of post-COVID lung fibrosis. The etiology of post-COVID lung
disease may be a sequela of prolonged mechanical ventilation, COVID-induced ARDS
or direct injury from the virus. Future research is needed to determine the
long-term persistence of post-COVID lung disease, its impact on patients and
ways to prevent or treat it.