3 of the 5 patients were over 70 years old; among them, 1 patient was a female smoker with diabetes, aged 80 years old, with moderate emphysema and a small amount of pleural effusion; 1 patient was a 70-year-old female, with emphysema and a small amount of pleural effusion as well; the other one was 75-year-old female with high blood pressure; the forth case was a 44-year-old male without any underlying disease; however, CT images showed only progressive lesions such as ground-glass opacification and consolidation without any fibrotic lesions (Fig. 5).