Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild pulmonary congestion on a background of interstitial lung disease appears similar to the prior chest radiograph performed 6 hours prior . There are small pleural effusions . The lung volumes are low each may accentuate the probably enlarged heart . Mediastinal contours are normal . Airspace opacity at the left lung base likely reflects interstitial lung disease although infection can not be excluded . No pneumothorax .
    OUTPUT:
    
Mild pulmonary congestion on a background of interstitial lung disease appears similar to the prior chest radiograph performed 6 hours prior . Airspace opacity at the left lung base likely reflects interstitial lung disease although infection can not be excluded .