Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well - expanded and clear . No focal consolidation , effusion , edema , or pneumothorax . No evidence of pneumomediastinum . Heart size is normal . No acute osseous abnormality . No evidence of subdiaphragmatic free air .
    OUTPUT:
    
No evidence of pneumomediastinum or subdiaphragmatic free air .