Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is mild enlargement of cardiac silhouette . The aortic knob is calcified . Mediastinal and hilar contours are unchanged . Multiple clips are noted within the neck compatible with prior thyroidectomy . There is no pulmonary vascular congestion . No focal consolidation , pleural effusion or pneumothorax is seen . Multilevel degenerative changes are present within the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary process .