Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear . The cardiomediastinal silhouette , hilar contours , and pleural surfaces are normal . No pulmonary edema , pleural effusion , pneumothorax , or pneumonia . Mild rightward tracheal deviation is due to an enlarged left thyroid lobe and aortic tortuosity .
    OUTPUT:
    
No pneumonia or acute cardiopulmonary process .