Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Upright AP and lateral views of the chest demonstrate a left chest wall pulse generator , with pacing wires terminating in the right atrium and right ventricle , unchanged from the prior study . The lung volumes are somewhat low , with background emphysema and interstitial prominence , similar compared to prior studies ; however , there are new left perihilar opacities which are concerning for infection . No pleural effusion or pneumothorax is detected . The cardiomediastinal silhouette is unremarkable .
    OUTPUT:
    
Left perihilar opacities , new since the prior study are concerning for pneumonia . Followup radiographs after treatment are recommended .