Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Bi-apical opacities likely represent scaring . Additionally , skin fold projects over the upper right lung and across midline . Otherwise , the lungs are clear without focal opacity , pulmonary edema , pleural effusion or pneumothorax . The cardiac and mediastinal contours are normal . Old bilateral rib fractures .
    OUTPUT:
    
No acute intrathoracic process .