Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size remains borderline enlarged . The mediastinal and hilar contours are normal . There is pulmonary vascular congestion . Lung volumes are slightly low with minimal atelectasis noted in the lung bases without focal consolidation . No pleural effusion or pneumothorax is visualized . Moderate degenerative changes are seen in the thoracic spine .
    OUTPUT:
    
Low lung volumes with mild bibasilar atelectasis .