Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is borderline enlarged . Mediastinal contour is unchanged . Mild pulmonary vascular congestion is noted . Patchy atelectasis is seen in the lung bases . No pleural effusion or pneumothorax is identified . No acute osseous abnormalities seen .
    OUTPUT:
    
Mild pulmonary vascular congestion and bibasilar atelectasis .