Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs show clear lungs . The cardiac size is normal and the mediastinum displays normal contours aside from a tortuous descending thoracic aorta . Hila are unremarkable and there is no pleural effusion or pneumothorax . The osseous structures are normal .
    OUTPUT:
    
No acute cardiopulmonary process .