Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is persistent opacity seen on the frontal view at the right lung base however no corresponding abnormality is identified on the lateral view . No pleural effusion or pneumothorax . The size and appearance of the cardiomediastinal silhouette is unchanged . A thoracic spine stimulator is present .
    OUTPUT:
    
No evidence of pneumonia .