Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are essentially clear aside from mild streaky atelectasis at lung bases bilaterally . Cardiomediastinal silhouette is remarkable for tortuosity of the thoracic aorta with possible component of dilation in the ascending portion . No pleural effusion or pneumothorax .
    OUTPUT:
    
No acute cardiopulmonary process . Tortuous and or dilated thoracic aorta .