Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . The heart is mildly enlarged . There is worsening left retrocardiac opacity . There are small bilateral pleural effusions , left greater than right . There is mild pulmonary vascular congestion without frank pulmonary edema . .
    OUTPUT:
    
Worsening left retrocardiac opacity overlying the spine on the lateral radiograph could reflect pneumonia in the appropriate clinical setting .