Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The hilar and cardiomediastinal contours are within normal limits . The aorta is mildly calcified and slightly tortuous . There is no pneumothorax or pleural effusion . Linear bibasilar densities are compatible with atelectasis . There is mild peribronchial cuff thickening and coarse parencymal densities bilaterally that may reflect a viral or atypical infection or underlying chronic interstitial disease .
    OUTPUT:
    
1 . Basilar atelectasis . 2 . Peribronchial cuffing and bilateral interstitial denisties may represent a viral or other atypical infection if acute , or underlying interstitial lung disease . Comparison with any prior radiographs would help determine chronicity .