Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: No previous chest x-rays on PACS record for comparison . Extreme lordotic positioning . There is increased retrocardiac opacity , with partial obscuration of the left hemidiaphragm . However , this is likely accentuated by patient positioning . The possibility of a pneumonic infiltrate in the left lower lobe can not be excluded . Possible upper zone redistribution , but doubt overt CHF . Heart size is at the upper limits of normal or slightly enlarged . Curvilinear lucency seen at the right base is not confirmed on the lateral view and likely represents artifact rather than free intra-abdominal air .
    OUTPUT:
    
1 ) Upper zone redistribution without overt CHF . 2 ) Left lower lobe infiltrate can not be excluded .