Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest . The lungs are under penetrated due to patient 's body habitus . Bilateral patchy airspace opacities with perihilar predominance represents pulmonary edema . Although difficult to evaluate , small bilateral pleural effusions are suspected . No pneumothorax is identified . Cardiomegaly is unchanged . The mediastinal contours appear stable .
    OUTPUT:
    
Moderate to severe pulmonary edema is relatively unchanged since ___ . No pneumothorax .