Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs again demonstrate intact sternotomy wires . The heart size is normal and the ascending aorta is mildly dilated / tortuous , but unchanged since at least ___ . The well - aerated lungs are clear . There is no pleural effusion or pneumothorax . No fracture is identified .
    OUTPUT:
    
1 . No acute abnormality . Please note that conventional chest radiography is not sensitive for subtle rib cage abnormalities . If there are focal findings on physical exam , dedicated rib radiographs in the area of interest can be obtained for further evaluation . 2 . Mildly dilated / tortuous ascending aorta , unchanged since at least ___ .