Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are slightly low . Heart size is mildly enlarged , unchanged . The aorta remains tortuous . The mediastinal and hilar contours are similar . Pulmonary vasculature is not engorged . Minimal patchy opacities are noted in the lung bases . No pleural effusion , focal consolidation or pneumothorax is present . Mild degenerative spurring is visualized in the thoracic spine .
    OUTPUT:
    
Minimal patchy bibasilar airspace opacities may reflect atelectasis in the setting of low lung volumes . Infection is not excluded in the correct clinical setting .