Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Study somewhat limited by lordotic positioning and the patient 's chin obscuring assessment of the lung apices . Low lung volumes are present . This accentuates the size of the cardiac silhouette which is likely within normal limits . Mediastinal contours are unchanged . Crowding of the bronchovascular structures is noted as a result of low lung volumes . No overt pulmonary edema is seen though mild pulmonary vascular congestion is not excluded . Streaky bibasilar airspace opacities which are more pronounced in the left lung base may reflect atelectasis . Infection is not excluded . No large pleural effusion or pneumothorax is seen . Multilevel degenerative changes are seen within the thoracic spine .
    OUTPUT:
    
Low lung volumes . Bibasilar airspace opacities , more pronounced on the left , could reflect atelectasis but infection is not excluded .