Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A triangular opacity in the right lung apex is new from prior examination . There is also fullness of the right hilum which is new . The remainder of the lungs are clear . Blunting of bilateral costophrenic angles , right greater than left , may be secondary to small effusions . The heart size is top normal .
    OUTPUT:
    
Right upper lobe pneumonia or mass . However , given right hilar fullness , a mass resulting in post-obstructive pneumonia is within the differential . Recommend chest CT with intravenous contrast for further assessment . Dr . ___ communicated the above results to Dr . ___ at 8 : 55 am on ___ by telephone .