Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Small left pleural effusion appears stable . There is improved aeration at the lung bases with minimal bibasilar atelectasis . No pulmonary edema or pneumothorax is detected . Cardiomegaly persists . The aorta is tortuous and calcified . Right rib fracture is again noted .
    OUTPUT:
    
Improved aeration of the lung bases with stable small left pleural effusion .