Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear stable . There is a persistent posterior right lower lobe and medial left lower lobe opacification , although somewhat blurred on this study . These seem to be of long chronicity even they are difficult to compare precisely to the prior study . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
No definite acute diease . Probably similar reticular opacities at both lung bases suggesting chronic lung disease .