Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . There is mild enlargement of the upper mediastinum . The lungs are clear without evidence of focal consolidations concerning for pneumonia . There is no pleural effusion pneumothorax . The visualized osseous structures are unremarkable .
    OUTPUT:
    
1 . No acute intrathoracic abnormalities identified . 2 . Mild enlargement of the upper mediastinum . This may be secondary to an enlarged thyroid gland , however recommend correlation with physical exam .