Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes remain low . Heart size is mildly enlarged with a left ventricular predominance . The mediastinal and hilar contours are unchanged . Pulmonary vasculature is not engorged . Patchy opacities in the lung bases may be due to atelectasis , but infection is not excluded in the correct clinical setting . No pleural effusion or pneumothorax is identified . Mild degenerative changes are noted in the thoracic spine .
    OUTPUT:
    
Low lung volumes with patchy opacities in the lung bases , likely atelectasis . Infection however is not excluded in the correct clinical setting .