Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with the immediate prior radiograph , pulmonary vascular congestion has decreased . Extensive interstitial opacities related to underlying interstitial lung disease could easily obscure small consolidations and determination of the presence or absence of an pneumonia would have to be on a clinical basis . There is no pleural effusion or pneumothorax . Moderate cardiomegaly is unchanged .
    OUTPUT:
    
1 . Interval decrease in pulmonary vascular congestion . 2 . Persistent interstitial opacities related to the underlying interstitial lung disease limit evaluation for pneumonia , and clinical correlation is recommended .