Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a large , indistinctly marginated opacity in and / or originating from the right upper lobe obscuring the upper and lateral borders of the right hilus . Rightward mediastinal shift and diaphragmatic elevation reflect right lung , predominantly upper lobe volume loss . Probable adenopathy enlarges the lower pole of the right hilus , and subcarinal adenopathy indents the underside of the right mainstem bronchus and protrudes posteriorly on the lateral view . These findings are most consistent with a central mass in the right upper lobe of right lung compromising the bronchus , accompanied by extensive central adenopathy , likely primary bronchogenic carcinoma , less commonly lymphoma . Pneumonia and reactive lymphadenopathy could also explain these findings , although less likely . Left lung , left pleural space , hilus and the left mediastinal contours are normal .
    OUTPUT:
    
Probable right upper lobe mass with postobstructive atelectasis and hilar and subcarinal adenopathy , primary bronchogenic carcinoma vs less likely lymphoma . Chest CT with contrast is recommended to stage and plan approach to diagnosis .