Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are coarse interstitial markings bilaterally with bibasilar fibrosis likely representing chronic interstitial lung disease . This opacification is slightly asymmetrically increased at the left base , which may represent asymmetric fibrosis , however an underlying pneumonia can not be excluded . There is biapical pleural parenchymal scarring . Heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
1 . Coarse interstitial markings bilaterally with bibasilar fibrosis , likely reflecting chronic interstitial lung disease . 2 . Asymmetric opacification at the left base may represent asymmetric fibrosis , however an underlying pneumonia can not be excluded .