Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Chest , portable . There is a small opacity overlying the left costophrenic sulcus , which may represent atelectasis . The lungs are otherwise clear and hyperinflated . Scarring in the lung apices is unchanged . Heart size is normal . There is no pneumothorax or pleural effusion . Pulmonary vascularity is normal . There are atherosclerotic calcifications in the aortic arch . Old right sided rib fractures are noted .
    OUTPUT:
    
Small opacity overlying the left costophrenic sulcus may represent atelectasis , however , early infectious process can not be fully excluded .