Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Comparison to ___ . Tracheostomy tube in good position . Right - sided PICC in the upper SVC . Widespread , severe parenchymal opacities have marginally improved , most notably in the in the left upper lobe . Background chronic fibrosis unchanged . Mild cardiomegaly . No pneumothorax or pleural effusion .
    OUTPUT:
    
Widespread , severe parenchymal opacities marginally improved in the left upper lobe .