Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is no pneumothorax or large mediastinal hemorrhage . The right hilum is full , similar to previous exam . The heart appears enlarged , however this likely technical . The mild interstitial abnormality has improved . Incidental note is made of aortic arch calcifications .
    OUTPUT:
    
No evidence of pneumothorax , or mediastinal hemorrhage .