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Atypical case a: Mild type patient. CT showed a small pGGO in the right middle lobe (arrow), and no abnormality in the remaining lobes. Atypical case b: Mild type patient. Only a small pGGO was detected in the left upper lobe with hale sign (arrow). Typical case c: Moderate type patient. CT showed multiple GGOs in the bilateral lobes with vascular dilatation and halo sign (arrow). Typical case d: Heavy type patient. CT showed diffused GGOs in the bilateral lobes
