Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with prior radiographs on ___ , there is a new retrocardiac opacity . Cardiomegaly is slightly increased from prior . There is vascular congestion , similar to prior , with no overt pulmonary edema . There are trace pleural effusions , similar to prior .
    OUTPUT:
    
Left lower lobe pneumonia . Cardiomegaly and vascular congestion , with no overt pulmonary edema .