Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is mildly enlarged . The mediastinal and hilar contours are within normal limits . There is mild pulmonary vascular congestion , with a small left pleural effusion slightly increased from the prior study . Patchy opacities in the lung bases are also increased , and may reflect atelectasis . No pneumothorax is detected .
    OUTPUT:
    
Mild pulmonary vascular congestion . Slightly increased small left pleural effusion with worsening opacities in the lung bases , potentially atelectasis but infection is not excluded .