Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to the prior chest radiograph of ___ , the previously seen right upper lobe opacity persists and is relatively unchanged . The lung volumes have slightly improved ; however , a left pleural effusion is new or increased since ___ . There is no pneumothorax . Median sternotomy wires and clips projecting over the left heart are again noted .
    OUTPUT:
    
Relatively unchanged right upper lobe pneumonia . New or increased left pleural effusion .