Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A frontal chest radiograph again demonstrates a left chest wall pacer device with leads overlying the right atrium and ventricle . The cardiomediastinal silhouette remains normal . Lung volumes are lower , resulting in bronchovascular crowding . Retrocardiac opacity is unchanged , but right base opacity is increased . No large pneumothorax identified . The visualized upper abdomen is unremarkable .
    OUTPUT:
    
Unchanged retrocardiac opacity . Increased right base opacity .