Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild enlargement of the cardiac silhouette is noted , unchanged . Mediastinal and hilar contours similar . Pulmonary vasculature is normal . Lungs are clear . No focal consolidation , pleural effusion or pneumothorax is seen . Mild multilevel degenerative changes are noted in the thoracic spine . There is a mildly elevated right hemidiaphragm , unchanged . Prior right mastectomy is again seen .
    OUTPUT:
    
No acute cardiopulmonary abnormality .