Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lordotic positioning with low inspiratory volumes . This creates considerable differences in the appearance of the chest , compared to the prior film . There is upper zone redistribution , likely accentuated by technical factors . No definite CHF . Minimal atelectasis at both bases , right - greater - than - left , is also likely related to low lung volumes . No frank consolidation or gross effusion identified . No pneumothorax detected .
    OUTPUT:
    
Low inspiratory volumes with bibasilar atelectasis . No definite CHF or focal consolidation . No pneumothorax or gross effusion .