Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged , unchanged . Mediastinal and hilar contours are similar . Mild pulmonary vascular congestion is demonstrated without frank pulmonary edema . Patchy atelectasis is seen in the lung bases without focal consolidation . No pleural effusion or pneumothorax is identified .
    OUTPUT:
    
Mild pulmonary vascular congestion and bibasilar atelectasis .