Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size and mediastinum are stable . A large hiatal hernia is redemonstrated . The lungs are well inflated . A well - defined opacity of the chest wall represents a loculated pleural effusion and it appears improved compared with prior exam . A mild stenosis of the trachea just above the aortic knob is redemonstrated and is not significantly changed compared with prior exams . No new focal opacity is noted . There is no evidence of pneumothorax .
    OUTPUT:
    
Interval improvement of right - sided loculated pleural effusion . Otherwise , no new acute cardiopulmonary process or acute worsening of tracheal narrowing .