Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are poorly expanded accounting for vascular crowding . There is increased interstitial thickening bilateral , with upper vascular redistribution but no focal opacities . Moderate - to - severe cardiomegaly is not significantly changed compared with prior exam . There is no evidence of pleural effusion or pneumothorax . Multiple thoracic surgical clips are noted . Sternotomy wires are intact . Leads from a pacemaker in the right hemithorax end in the right atrium and right ventricle in unchanged position compared with prior exam .
    OUTPUT:
    
Interstitial pulmonary edema .