Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is at the upper limits of normal size . The mediastinal and hilar contours appear within normal limits . There is no pleural effusion or pneumothorax . Interstitial opacification is mildly prominent including peribronchial cuffing . Mild degenerative changes are similar along the lower lumbar spine .
    OUTPUT:
    
Mild interstitial prominence . Correlation with clinical factors is suggested . Possibilities include mild pulmonary vascular congestion but an inflammatory process involving the airways could also be considered .