Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The endotracheal tube has been removed . A single lead external pacer remains in place . There is no pneumothorax . Mild cardiomegaly despite the projection is unchanged . The patient has had previous aortic valve replacement . Mild pulmonary edema has improved . Minimal retrocardiac subsegmental atelectasis is unchanged .
    OUTPUT:
    
Improved mild pulmonary edema .