Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were reviewed and compared to the prior study . Lung volumes have improved since ___ and the lungs are clear . Elevation of the left hemidiaphragm is unchanged since ___ , small bilateral pleural effusions are also unchanged . There is prominence of the ascending aorta . The heart size is normal . Multiple nondisplaced right posterior rib fractures and humeral head orthopedic hardware are unchanged .
    OUTPUT:
    
1 . Lung volumes have improved since ___ . 2 . Small bilateral pleural effusions are unchanged since ___ .