Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear . Heart is normal in size . There is a 4 x 2 cm right mediastinal mass , which obliterates the paratracheal stripe and is bulging into the lung parenchyma that is not well seen on the lateral view and not present on the previous CT exam . The pleural surfaces are normal without effusion or pneumothorax .
    OUTPUT:
    
Right mediastinal mass , not previously seen should be evaluated with CT for further characterization . Findings communicated to Dr . ___ by telephone at 2 : 12 PM on ___ by Dr . ___ . Updated findings communicated to Dr . ___ by telephone at 4 :23 PM by Dr . ___ .