Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . Focal prominence of the descending thoracic aortic contour at the level of the AP window corresponds to the previously noted focal type B aortic dissection with saccular aneurysm seen on recent CT . No acute cardiopulmonary abnormality otherwise demonstrated . Hilar contours are unremarkable . Lungs are clear . Pulmonary vasculature is normal . No pleural effusion or pneumothorax is seen . No acute osseous abnormality is identified .
    OUTPUT:
    
Focal prominence of the descending thoracic aortic contour at the level of the AP window corresponds to the previously noted focal type B aortic dissection with saccular aneurysm seen on CT . No acute cardiopulmonary abnormality otherwise demonstrated . No acute cardiopulmonary abnormality otherwise demonstrated .