Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison to the prior exam , the lung volumes are significantly decreased . The right hemidiaphragm is elevated in comparison to the left . The patient is rotated , limiting evaluation . There is crowding of the bronchovascular structures without overt pulmonary edema . There is no focal airspace consolidation , pleural effusion , or pneumothorax . An irregular calcification overlying the right mid lung zone is unchanged . The aorta is tortuous , and stable . The heart size is mildly enlarged , and stable . Old left sided rib fractures are unchanged .
    OUTPUT:
    
Very low lung volumes , limiting the evaluation , and making a component of pulmonary edema difficult to exclude . No severe pulmonary edema is present .