Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There areas of bilateral lower lobe atelectasis . Slight blunting of the left posterior costophrenic angle could be due to a trace pleural effusion . Left basilar opacity , retrocardiac , could be due to atelectasis however infectious process is not excluded in the appropriate clinical setting . No pneumothorax is seen . The cardiac silhouette is top - normal to mildly enlarged . Mediastinal contours are unremarkable .
    OUTPUT:
    
Relatively low lung volumes with areas of atelectasis . Left basilar opacity may relate to atelectasis however , underlying consolidation not excluded . Possible trace left pleural effusion .