Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette size is normal . The hilar contours are normal . The mediastinal contours are notable for symmetric widening of the superior mediastinum bilaterally , without deviation of the trachea . Prominent left epicardial fat pad is noted . The pulmonary vascularity is normal . Within the periphery of the right upper lung field is a 2 .5 cm rounded lucency with a thin wall which could represent a bulla . The remainder of the lungs are clear without focal consolidation . No pleural effusion or pneumothorax is present . No acute osseous abnormality is seen .
    OUTPUT:
    
1 . Relatively symmetric widening of the superior mediastinum without tracheal deviation . Findings could be due to prominent vascular structures or possibly a thyroid goiter . Further evaluation with a chest CT on a non urgent basis can be obtained for further evaluation . 2 . 2 .5 cm lucent lesion within the right upper lung field , likely a bulla .