Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs . The lungs are hyperinflated and the diaphragms are flattened , consistent with COPD . Mild to moderate cardiomegaly is stable . Mild increased interstitial markings appear new -- the ddx includes mild CHF versus an early institial infiltrate . No focal infiltrate or frank consolidation is detected . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Mild increased interstitial markings -- ? mild CHF versus early interstitial infiltrate .