Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate fully expanded and clear lungs . Again noted , is a tortuous atherosclerotic aorta . The cardiomediastinal and hilar contours are unchanged . There is no pleural effusion or pneumothorax . There is a small amount of linear atelectasis at the left lung base .
    OUTPUT:
    
No evidence of pneumonia .