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A severe case of COVID-19. A man aged 47 years presented with a 7-day history of fever, cough, and sputum. a, b On the third day after disease onset, CT imaging revealed diffuse pure GGO and GGO with fine grid in the bilateral lobes. c, d The area of the lesions was delineated on the axial and reconstructed images. e Histogram map of the lesions
