Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison to the chest radiograph obtained 9 days prior , no significant changes are appreciated . Lungs are fully expanded and clear without consolidations or suspicious pulmonary nodules . No pleural abnormalities . Heart size is normal . Cardiomediastinal and hilar silhouettes are normal . There may be slight leftward deviation of the superior trickle trachea , indicating the possibility of focal thyroid enlargement or a thyroid nodule .
    OUTPUT:
    
No radiographic evidence of pneumonia or other significant cardiopulmonary abnormalities . Possible right thyroid enlargement or nodule . Clinical correlation necessary .