Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate a normal cardiac silhouette . The aorta is tortuous or dilated , with calcifications seen within the aortic knob . The lungs are moderately hypoinflated , with atelectasis at the left base . No focal consolidation , pleural effusion , or pneumothorax is seen . The visualized upper abdomen is unremarkable .
    OUTPUT:
    
1 . No acute cardiopulmonary process . 2 . The aorta is either tortuous or dilated . These can not be differentiated radiographically .