Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lordotic positioning . Heart size is at the upper limits of normal or slightly enlarged . Allowing for technical differences , this is probably unchanged compared with ___ . Aorta is calcified an minimally unfolded . Hilar hand mediastinal contours are unchanged . There is upper zone redistribution , without other evidence of CHF . There is mild patchy opacity in the right cardiophrenic region , slightly more pronounced than on the prior film . There is minimal atelectasis at the left lung base . Possible blunting of the left costophrenic angle , but no gross effusion on either side .
    OUTPUT:
    
1 . Cardiomegaly , probably unchanged . 2 . Upper zone redistribution without other evidence of CHF . 3 . Patchy opacity in the right cardiophrenic region is slightly more pronounced than on ___ , albeit likely accentuated by technical differences . The differential diagnosis includes focal atelectasis , early infiltrate or focus of aspiration .