Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is top normal . Mediastinal contours are stable . The left hemidiaphragm is indistinct , consistent with a combination of effusion and atelectasis . Right medial lung base opacity likely represents atelectasis . No definite focal consolidation concerning for pneumonia . No pneumothorax . There are moderate atherosclerotic calcifications across the aortic arch .
    OUTPUT:
    
Small left pleural effusion with bibasilar atelectasis . No focal consolidation .