Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . The patient is post left pneumonectomy , with leftward shift of the mediastinum . An SVC stent is unchanged in position . There is no right pneumothorax . A small right pleural effusion is stable . The overall radiographic appearance is unchanged since the ___ study performed at 7 :04 PM .
    OUTPUT:
    
No right pneumothorax . Unchanged small right pleural effusion .