Figure 2d:

(a) Axial chest CT image at presentation shows a small solitary nodular ground-glass opacity in left upper lobe (arrow). (b, c) Note the progression of airspace disease 3 days later, with new foci of ground-glass opacities (black arrows, b, c), as well as developing consolidation (white arrow). Additionally, there is higher peripheral attenuation with ground-glass opacities more centrally representing the reversed halo sign (curved arrows, c). (d, e) Further increase in extent of ground glass changes with new cavity in right lung (arrow, d) as well as new areas of consolidation (arrow, e) are seen on CT images 5 days after presentation.

(a) Axial chest CT image at presentation shows a small solitary nodular ground-glass opacity in left upper lobe (arrow). (b, c) Note the progression of airspace disease 3 days later, with new foci of ground-glass opacities (black arrows, b, c), as well as developing consolidation (white arrow). Additionally, there is higher peripheral attenuation with ground-glass opacities more centrally representing the reversed halo sign (curved arrows, c). (d, e) Further increase in extent of ground glass changes with new cavity in right lung (arrow, d) as well as new areas of consolidation (arrow, e) are seen on CT images 5 days after presentation.

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