Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal view of the chest . Heterogeneous right lung base opacity has increased since ___ with indistinct appearance of the pulmonary vascular markings and bilateral ill - defined perihilar opacities . ___ B lines can be appreciated in the peripheral right lower lobe . Superimposed right lower lobe pneumonia can not be entirely excluded . Presumed bilateral pleural effusions are not large . No pneumothorax . Moderate cardiomegaly and cardiomediastinal contours are stable .
    OUTPUT:
    
Asymmetric severe pulmonary edema , most prominently affecting the right lower lung . Please correlate with clinical symptoms for superimposed pneumonia .