Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval increase in right lung base opacity . In addition , diffuse increase in interstitial markings bilaterally suggests mild interstitial edema . Cardiomediastinal silhouette is stable . There is no pleural effusion or pneumothorax . Sternotomy wires are intact . An ICD monitor is seen overlying the left hemithorax , with a single lead ending in unchanged position in the inferior wall of the heart .
    OUTPUT:
    
Mild interstitial pulmonary edema . Relative increase in opacity at the right lung base could be due to underlying infection / pneumonia or relate to assymetric fluid overload .