Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is at the upper limits of normal . The mediastinal and hilar contours are unremarkable . The lung volumes are lower than prior study with basilar atelectasis , but no lobar consolidation . There is no large pleural effusion or pneumothorax . There is no pulmonary edema .
    OUTPUT:
    
Low lung volumes with bibasilar atelectasis .