Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal view of the chest was obtained . A new left pleural tube has an expected course . Single - lead wire of a left chest wall pacer terminates in stable position . The patient is status post pericardial window with decreased size of the cardiac silhouette , which is now of top normal size . Asymmetric opacity in the left upper lung could represent aspiration and is similar to prior . Right lower lung opacity is improved and was likely edema . No pneumothorax .
    OUTPUT:
    
1 . Status post pericardial window with decreased size of cardiac silhouette . 2 . Left pleural tube has an expected course . 3 . Asymmetric left upper lung opacification is stable and may represent aspiration