Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs . The right costophrenic sulcus is blunted . However , this appearance appears similar to prior CT chest which showed scarring . The lungs are clear . There is no pleural effusion or pneumothorax . The cardiomediastinal silhouette is normal .
    OUTPUT:
    
No acute cardiopulmonary process .