Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiograph demonstrates a small right - sided pleural effusion which appears largely unchanged when compared to chest radiograph dated ___ . No evidence of pneumonia or pulmonary edema . Cardiomediastinal and hilar contours are stable . A left pectorally placed pacer is identified , its leads with an uncomplicated course in unchanged positions .
    OUTPUT:
    
Essentially unchanged small right - sided pleural effusion .