Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low , resulting in crowding of the bronchovascular structures . The left costophrenic angle is blunted , which may reflect left basilar effusion versus atelectasis , although infection can not be excluded . No lobar consolidation , pleural effusion , pneumothorax , or overt pulmonary edema is seen . The heart size is normal . Mediastinal contours are normal .
    OUTPUT:
    
Left CPA blunting may reflect atelectasis versus small pleural effusion . Findings may also reflect infection in the appropriate clinical setting .