Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable view of the chest compared to previous exam from ___ . Given differences in positioning and technique , there has been no significant interval change . Increased interstitial markings are again seen , suggestive of chronic underlying lung disease . Blunting of the left costophrenic angle and thickening of the pleura laterally suggestive of scarring and prominent extrapleural fat . Cardiomediastinal silhouette is stable and notable for prior median sternotomy with mediastinal clips .
    OUTPUT:
    
No acute cardiopulmonary process .