Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are hyperexpanded . Patchy retrocardiac opacity is worse compared to prior . There is no pneumothorax . There may be a trace left effusion . The cardiomediastinal silhouette is enlarged , similar to prior . There is mild pulmonary vascular congestion , worse than before . No free air below the right hemidiaphragm is seen .
    OUTPUT:
    
1 . Patchy retrocardiac opacity may represent pneumonia . 2 . Discordance of severe cardiomegaly with mild vascular congestion raises the question of possible cardiomyopathy .