Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral chest radiograph is compared to prior study dated ___ . The heart is markedly enlarged though similar in size when compared to prior study . Patient is status post median sternotomy . Clips are noted projecting over the left midlung zone . Relative to prior study , there is previously noted mild edema is improved . No large pleural effusion is present . There is no pneumothorax . Visualized osseous structures demonstrate no acute abnormality . Eventration of the right hemidiaphragm noted .
    OUTPUT:
    
Relative to prior study dated ___ , mild pulmonary edema is improved . Marked cardiomegaly is stable .