Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes . This accentuates the size of the cardiac silhouette which is likely moderately enlarged . The mediastinal contour is widened , with mild tortuosity of the thoracic aorta which demonstrates calcifications . Crowding of bronchovascular structures is noted . There are bilateral lower lobe opacities , likely atelectasis , though non-specific . No pleural effusion or pneumothorax is seen . No acute osseous abnormality is visualized .
    OUTPUT:
    
Low lung volumes , which limits assessment of the lung bases . Probable bibasilar atelectasis , though repeat study with improved inspiration is recommended if there is continued concern for aspiration .