Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Ill - defined airspace opacity in the right mid and lower lungs corresponds to the right perihilar mass with extension inferiorly which may represent postobstructive pneumonia within the right middle lobe . Prominence of the right middle mediastinal border suggests enlargement of the ascending aorta .
    OUTPUT:
    
1 . Right lower lung airspace opacity may represent a postobstructive pneumonia of the right middle lobe related to the right hilar mass . 2 . Prominence of the right mediastinal contour suggests enlargement of the ascending aorta , top - normal on the prior CT measuring up to 3 .5 cm .