Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs . The lungs are well expanded . Left basilar effusion and atelectasis are similar . Severe cardiomegaly is unchanged . Pneumomediastinum appears similar to ___ . Aortic arch calcifications and sternal wires are unchanged .
    OUTPUT:
    
Stable appearance of severe cardiomegaly and pneumomediastinum after AVR .