Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The left lung is well - expanded and clear . A right middle and right lower lobe opacity obscuring the right heart border is seen . A small right pleural effusion is noted . No left pleural effusion . A tubular air - filled structure projecting over the right mid hemi thorax is most consistent with focal atelectasis . The mediastinum is widened measuring ___ .2 cm . Visualized heart is otherwise unremarkable .
    OUTPUT:
    
1 . Widened mediastinum is nonspecific and can be seen in the setting of ascending aortic aneurysm and dissection . Clinical correlation is recommended in comparison with prior imaging would be helpful . 2 . Right middle and right lower lobe opacity with small right pleural effusion is worrisome for pneumonia . 3 . Tubular air - filled structure over right mid hemi thorax is most consistent with focal atelectasis