Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Heart size is borderline enlarged . Mediastinal and hilar contours are unremarkable . Pulmonary vasculature is normal . Patchy opacities are demonstrated in the lung bases . Elevation of the right hemidiaphragm is chronic . No pleural effusion , focal consolidation or pneumothorax is present . Mild degenerative changes are seen throughout the thoracic spine .
    OUTPUT:
    
Patchy bibasilar airspace opacities likely reflective of atelectasis in the setting of low lung volumes .