Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is opacification of the left hemithorax , with rightward shift of the mediastinum , consistent with a large left effusion . The right lung is clear without effusion , focal consolidation , or pneumothorax . The left heart border is obscured .
    OUTPUT:
    
Opacification of the entire left hemithorax , with rightward shift of the mediastinum , consistent with large left effusion .