Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Transvenous pacing leads ending in the right atrium and right ventricle . Mild cardiomegaly is unchanged . There is no pleural effusion or pneumothorax . There is increased opacification posteriorly on the lateral view corresponding to the left basilar opacity . Additionally , interstitial markings are mildly increased from prior .
    OUTPUT:
    
Left lower lobe pneumonia .