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. 2021 Feb;9(3):216. doi: 10.21037/atm-20-2464

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2021 Annals of Translational Medicine. All rights reserved.

Open Access Statement: This is an Open Access article distributed in accordance with the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International License (CC BY-NC-ND 4.0), which permits the non-commercial replication and distribution of the article with the strict proviso that no changes or edits are made and the original work is properly cited (including links to both the formal publication through the relevant DOI and the license). See: https://creativecommons.org/licenses/by-nc-nd/4.0.

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The attenuation category of COVID-19 pneumonia. (A) Type I, pure ground-glass opacity (pGGO) manifests as a hazy opacity without obscuring the underlying vessels. (B) Type II, GGO with consolidation is defined as an area of opacification obscuring the underlying vessels in the GGO. (C) Type III, GGO with interlobular septal thickening or reticulation is defined as a crazy-paving sign. (D) Type IV, consolidation. COVID-19, coronavirus disease 2019.