Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged . Widening of the right superior mediastinal contour is concerning for underlying lymphadenopathy or mass which appears to be primarily posterior in location , narrowing and displacing the trachea anteriorly . Pulmonary vasculature is not engorged . Patchy opacities in the lung bases likely reflect areas of atelectasis . There may be trace bilateral pleural effusions . No pneumothorax is identified . There are no acute osseous abnormalities .
    OUTPUT:
    
1 . Abnormal widening of the right superior mediastinal contour , concerning for a posterior mediastinal mass which narrows and deviates the trachea anteriorly . Further assessment with CT with contrast is suggested . 2 . Bibasilar atelectasis and possible trace bilateral pleural effusions .