Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is marked S - shaped scoliosis centered on the upper thoracic spine , as on prior exams . The cardiomediastinal silhouettes are normal . There is a calcified aortic arch . The bilateral hila are unremarkable . The lungs are clear . There is no pulmonary vascular congestion . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
No acute cardiopulmonary process .