Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear of consolidation , effusion , or pulmonary edema . Cardiac silhouette is top - normal in size . There is tortuosity of the descending thoracic aorta . There is apparent narrowing of the mid to lower trachea , not significantly changed since priors . No acute osseous abnormalities . Chronic left lateral second , third , and fourth rib fractures are noted .
    OUTPUT:
    
No acute cardiopulmonary process . Persistent apparent narrowing of the trachea as previously detailed can be further assessed by CT scan .