Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest . Mild cardiomegaly is unchanged . Tortuous aorta with calcification of the aortic knob is similar to prior . Interstitial fluid has increased with indistinct appearance of the pulmonary vasculature . Small right base and retrocardiac opacities are new since the prior exam . Bilateral lower lobe predominant increased interstitial markings are similar to prior and may represent a chronic interstitial disease . No pneumothorax or substantial pleural effusion .
    OUTPUT:
    
Pulmonary edema with bibasilar air space opacities that could represent superimposed pneumonia .