Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a moderate size left pleural effusion with associated retrocardiac opacity . Effusions decrease compared to the study from the prior day . There is a small right effusion with volume loss the right lower lobe . There continues to be moment minimal pulmonary vascular redistribution . The right IJ line tip is in the right atrium . The patient is status post valve replacement . Degenerative changes are again seen in the right humeral head .
    OUTPUT:
    
Decreased left effusion .