Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are slightly low with mild bronchovascular crowding . Retrocardiac opacity may reflect atelectasis . Right lower lobe atelectasis is mild . No pleural effusion common pneumothorax , edema at , or definite focal consolidation to suggest pneumonia . No acute osseous abnormality .
    OUTPUT:
    
Low lung volumes and bibasilar atelectasis .