Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette size is top normal . The mediastinal and hilar contours are relatively unchanged with mild unfolding of the thoracic aorta . Pulmonary vascularity is not engorged . There is crowding of the bronchovascular structures . No overt pulmonary edema is present . There is minimal streaky atelectasis at the lung bases . No focal consolidation , pleural effusion or pneumothorax is identified . Mild loss of height of a mid thoracic vertebral body appears unchanged .
    OUTPUT:
    
Low lung volumes with probable mild bibasilar atelectasis .