Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs were obtained . Left lower lobe opacity with air bronchograms has slightly increased in conspicuity but has been present on prior studies dating back to ___ . Cardiomegaly is accompanied by cephalization of the pulmonary vasculature and mild interstitial edema . There is no effusion or pneumothorax . Biventricular pacing leads are in unchanged positions .
    OUTPUT:
    
Cardiomegaly and mild interstitial edema .