Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Evaluation of the cardiomediastinal silhouette is limited due to dense opacifications in the left lung . Left upper lobe opacification corresponds with known large mass thought to represent malignancy . The increase in left lower basal opacification is a combination of enlarging left pleural effusion and worsening atelectasis . Previous interstitial edema has resolved . Right lung is clear and there is no right pleural effusion .
    OUTPUT:
    
Large left perihilar malignancy . Increasing large pleural effusion . Resolved interstitial edema .