Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is at upper limits of normal or slightly enlarged , similar to ___ . Aorta is minimally unfolded . Possible minimal upper zone redistribution , but no overt CHF . No focal infiltrate or effusion . No pneumothorax detected . Mild eventration of the right hemidiaphragm is unchanged . Borderline low inspiratory lung volumes . In the extreme upper aged these films , the lower portion of his cervical spine fixation hardware is noted .
    OUTPUT:
    
Heart size at the upper limits of normal or slightly enlarged , unchanged compared with ___ . Mild upper zone redistribution , also similar to prior , without overt CHF . Otherwise , no acute intrathoracic process .