Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A portable frontal chest radiograph again demonstrates moderate cardiomegaly and well - aerated lungs . Mild pulmonary edema is persistent , but improved . A trace left pleural effusion is unchanged . No focal consolidation or pneumothorax is present . An incompletely imaged right upper extremity graft is unchanged . The visualized upper abdomen is unremarkable .
    OUTPUT:
    
Persistent but improved mild pulmonary edema . Unchanged trace left pleural effusion .