Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size remains within normal limits . Mediastinal and hilar contours are unchanged , with dilatation of the main , right , and left pulmonary arteries compatible with underlying pulmonary arterial hypertension . Pulmonary vascularity is normal . Lungs are clear . No focal consolidation , pleural effusion or pneumothorax is identified . Scoliosis of the thoracic spine , convex to the right is noted .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Unchanged pulmonary arterial hypertension .