Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable upright AP chest radiograph obtained . Dual - lead pacer is unchanged in position . Lung volumes are similar to prior with interval development of mild interstitial edema . There is no pleural effusion or pneumothorax . Cardiomediastinal silhouette is stable . Bony structures are intact .
    OUTPUT:
    
Mild interstitial edema , new from prior .