Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable view of the chest is compared to previous exam from ___ . The lungs are grossly clear . Costophrenic angles are sharp . As on prior , there is enlargement of the azygos contour which could be accentuated due to patient 's positioning and technique . Cardiac silhouette remains stable with moderate enlargement .
    OUTPUT:
    
Moderate cardiomegaly . Prominent azygous arch . No signs of pneumonia .