Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low leading to crowding of the bronchovascular structures . Left lower lobe and retrocardiac opacity likely reflects atelectasis . There is now definitive lobar consolidation , pleural effusion , or pneumothorax . The cardiomediastinal silhouette is within normal limits .
    OUTPUT:
    
Low lung volumes and left basilar atelectasis . No definitive consolidation .