Fig. 2

The CT changes of a patient with fever (38.5 °C) for one-day (severe type). a At initial CT, a small region of subpleural ground-glass opacity (GGO) was demonstrated in the right upper lobe; b the first follow-up (day 4), there was an enlarged region of GGO with superimposed inter- and intralobular septal thickening (crazy-paving pattern) with partial consolidation; c the second follow-up (day 8), crazy-paving pattern extended to more regions with a new area of subpleural consolidation; d the third follow-up (day 12), partial resolution of the crazy-paving pattern and consolidation; e the fourth follow-up (day 17), continued absorption of residual crazy-paving pattern with the presence of pleural adhesion and fibrosis; f the fifth follow-up (day 23), minimal residual GGO were observed. All images have the same window level of −700 and window width of 1000