Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Apparent widening of the mediastinal silhouette and a density projecting over the left heart border are consistent with extensive mediastinal fat seen on CT ___ and low lung volumes . A right perihilar mass is better evaluated on CT ___ . An opacity at the left lung base is new . No evidence of fracture or dislocation .
    OUTPUT:
    
1 . No evidence of fracture or dislocation . 2 . An opacity at the left lung base is new from the prior examination and may represent infection or infarction . 3 . A right perihilar mass is better evaluated on CT ___ .