Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Extensive postoperative changes of the left hemithorax are again noted , with overall similar appearance compared to the prior study . A partially loculated left pleural effusion is again noted , with persistent obscuration of the left hemidiaphragm . The right lung is grossly clear . The cardiomediastinal silhouette is not significantly changed .
    OUTPUT:
    
Overall similar appearance of the chest compared to ___ . No evidence of focal pneumonia . Stable left post operative changes .