Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is mild pulmonary vascular redistribution . There alveolar infiltrates in both lower lobes . There is a probable small left effusion . Compared to the prior study , the appearance of the lower lobes is worse . Is unclear if this is due to pulmonary edema or an infectious infiltrate .
    OUTPUT:
    
Bilateral lower lobe infiltrates that could be due to pulmonary edema or infection .