Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette continues to be mildly enlarged with improving mild pulmonary edema since the last radiograph . An ascending Swan - Ganz catheter is unchanged with the tip overlying the region of the tricuspid valve . The intra-aortic balloon pump is in the descending aorta approximately at the level of the superior margin of the left main bronchus . There is no pneumothorax .
    OUTPUT:
    
Interval improvement in mild pulmonary edema . IABP ends just above the level of the left main bronchus , and the Swan - ganz catheter overlies the region of the tricuspid valve .