Figure 1.

(A) Initial chest radiograph obtained 6 days after the influenza vaccine was administered, showing multi-focal areas of patchy and peribronchial opacities in both lungs. (B) Chest CT obtained 9 days after the influenza vaccine was administered, revealing a large area of ground-glass opacities with superimposed interlobular septal thickening, the so-called crazy-paving appearance (arrow), in the right upper lobe. (C) Chest CT at the level of the lower lungs, showing multi-focal areas of airspace consolidation in both lungs, with small amounts of bilateral pleural effusion.