Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Significant decrease in bilateral interstitial pulmonary abnormality compared to ___ . No pleural effusion or pneumothorax is seen . The cardiac and mediastinal silhouettes are unremarkable . Patient has history of TAVR .
    OUTPUT:
    
Substantial improvement in bilateral diffuse interstitial pulmonary abnormalities since ___ .