GCOs are the hazy appearance of the lungs on the imaging studies of patients.  Could be due to filling the pulmonary spaces with fluid or the collapse of the space.

University of California, Santa Cruz

Coronavirus pneumonia tends to affect the entire lung as opposed to other viral pneumonia affecting small parts. As per respiratory clinicians and radiologists, the 3 features  of coronavirus pneumonia are ground-glass opacities, consolidation, and pleural effusion seen in the chest of the CT scans.

COVID-19 pneumonia vs. other viral pneumonia

Sharma, S. Drawing insights from COVID-19-infected patients using CT scan images and machine learning techniques: a study on 200 patients. Environ Sci Pollut Res (2020). https://doi.org/10.1007/s11356-020-10133-3

Drawing insights from COVID-19-infected patients using CT scan images and machine learning techniques: a study on 200 patients

Ground-glass opacities

Consolidation refers to pulmonary airspace being filled with fluid or other products of inflammation. 

Consolidation 

Abnormal fluid being built up in the space around the lungs.

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