Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single upright AP view of the chest demonstrates the lungs are well expanded , with no evidence of pleural effusion , pulmonary edema , pneumothorax , or focal consolidation concerning for pneumonia . There is mild pulmonary vascular congestion and streaky opacities at the lung bases . The heart size is mildly enlarged . The mediastinal silhouette is unremarkable . There is no subdiaphragmatic free air .
    OUTPUT:
    
Mild pulmonary vascular congestion and bibasilar atelectasis .