Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes are present . The cardiac silhouette size is mildly enlarged . The mediastinal and hilar contours are unremarkable . Crowding of bronchovascular structures results from low lung volumes . No overt pulmonary edema is present . Subsegmental atelectasis is noted in the lung bases without focal consolidation . No pleural effusion or pneumothorax is seen . Elevation of the right hemidiaphragm is of unknown chronicity . No displaced fractures are evident .
    OUTPUT:
    
Low lung volumes with subsegmental bibasilar atelectasis . Elevation of the right hemidiaphragm of unknown chronicity .