Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . There is now 0 8 left chest wall pacer device with leads extending into the region of the right atrium and right ventricle . Overall , the heart size appears normal . There is a subtle retrocardiac opacity which is concerning for pneumonia . No large effusion or pneumothorax . Mediastinal contour appears unchanged . Bony structures are intact .
    OUTPUT:
    
Left lower lobe consolidation concerning for pneumonia .