Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac pacemaker . Mildly improved right basilar opacity . Decreased interstitial markings lower lungs , particularly on the left . There is tiny right pleural effusion or thickening , similar . Mildly increased heart size , pulmonary vascularity , similar . Mitral annular calcifications . There are no rib fractures .
    OUTPUT:
    
Mild improvement since prior exam