Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is mildly enlarged . The mediastinal and hilar contours are unremarkable . Mild pulmonary vascular congestion is demonstrated with patchy atelectasis in the lung bases . No pleural effusion or pneumothorax is noted . There are no acute osseous abnormalities .
    OUTPUT:
    
Mild pulmonary vascular congestion and bibasilar atelectasis .