Fig. 1. 59-year old man with one-week history of dry cough and acute onset of fever and dyspnea.

A. Unenhanced chest CT obtained on day 7 after onset of symptoms reveals focal ground-glass opacities in left upper lobe of lung. B. Chest CT was obtained one week later and shows bilateral multifocal mixed ground-glass opacities and crazy-paving pattern. C. Chest CT obtained on day 19 shows decreased ground-glass opacities and crazy-paving patterns with peripheral cystic changes and interlobulary septal thickening causing typical ‘honeycomb’ appearances due to pulmonary fibrosis.