Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild elevation of the left hemidiaphragm limits evaluation of the cardiac silhouette ; however , heart size appears normal with mild tortuosity of the thoracic aorta . Hilar contours are unremarkable . Lungs are clear . Pleural surfaces are clear without effusion or pneumothorax . Multiple healed rib fractures appear chronic .
    OUTPUT:
    
1 . No acute cardiopulmonary abnormality . 2 . Chronic elevation of the left hemidiaphragm may be related to prior trauma as evidenced by multiple healed left sided rib fractures .