Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Lungs are clear without focal consolidation , large effusion or pneumothorax . The heart size is stable and normal . There is prominence of the superior mediastinum which likely reflect enlarged thyroid gland as seen on prior CTA head and neck . Please correlate clinically . Bony structures are intact . No free air seen below the right hemidiaphragm .
    OUTPUT:
    
Prominence of the superior mediastinum , likely reflecting thyroid enlargement . Otherwise unremarkable exam .