Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a small right - sided pleural effusion , unchanged compared to the exam from ___ . The lungs are otherwise clear . There is no pneumothorax . The mediastinal and hilar contours are normal . The heart is normal in size .
    OUTPUT:
    
Unchanged right - sided small pleural effusion . No evidence of a pneumothorax .