Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right upper lobe collapse upper lung zone around a central tumor is longstanding ; less severe left upper lobe atelectasis has been variable . The lung volumes are low . Persistent , moderate bilateral pleural effusions , left greater than right , are somewhat larger . Small multifocal lung metastases are better characterized on the recent CT . The cardiomediastinal silhouette is difficult to evaluate given the low lung volumes and effusion .
    OUTPUT:
    
1 . Persistent right upper lobe collapse and less severe left upper lobe atelectasis around central tumors . 2 . Bilateral large pleural effusions have slightly increased in size since the prior exam . 3 . No new consolidation to suggest a new pneumonia . 4 . Numerous small lung metastases .