Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest are provided . Dual - lead pacer is unchanged in position . There is persistent elevation of the left hemidiaphragm which is stable . There is interval development ___ ___ B lines , indicative of mild pulmonary interstitial edema . There is no effusion or pneumothorax . Heart and mediastinal contour remain stable . Bony structures are intact .
    OUTPUT:
    
Mild interstitial edema , new from prior .