Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is no evidence of pneumothorax . There is biapical scarring left greater than right . No definite rib fractures are visualized . Obscuration of the left heart border likely represents cardiophrenic fat . The patient is status post right mastectomy .
    OUTPUT:
    
No definite rib fractures are seen . No pneumothorax .