Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest were obtained . Midline sternotomy wires and mediastinal clips are again noted . Mild interstitial edema is noted without overt CHF . No large pleural effusions are seen , nor is there pneumothorax . No definite signs of pneumonia . Heart and mediastinal contours appear grossly unremarkable . Degenerative hypertrophic change at the AC joint is noted bilaterally .
    OUTPUT:
    
Mild pulmonary interstitial edema .