Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Cardiac silhouette size remains normal . Mediastinal and hilar contours are unchanged . Pulmonary vasculature is not engorged . Patchy atelectasis is noted in the lung bases without focal consolidation . No pleural effusion or pneumothorax is present . Mild degenerative changes are noted in the thoracic spine .
    OUTPUT:
    
Mild patchy bibasilar atelectasis in the setting of low lung volumes .