Fig. 4.

A 16-year-old girl presented with fever, cough, sputum, nasal discharge and dyspnoea. a Anteroposterior chest radiograph, on the day of admission, shows multifocal airspace consolidations, ground glass opacities and reticular opacities in both lungs. b Axial contrast-enhanced chest CT scan performed the same day demonstrates focal bilateral patchy rounded ground glass opacities (arrows) surrounded by a more or less complete ring-like consolidation (reverse halo sign) suggesting organizing pneumonia, which was a sign of severe extent of the disease. c Anteroposterior chest radiograph, 3 days later, showed increased right and improved left airspace opacities. d Posteroanterior chest radiograph, 17 days later, showed improvement in bilateral airspace opacities with residual reticular and ground glass opacities in the right upper, right lower and left lower lobes