Fig. 4From: IgG4-related lymphadenopathy – a difficult diagnosisa CD138 immunostain highlights the plasma cells and b IgG4 immunostain highlights the subset of CD138 plasma cells which are IgG4 positive. The overall there were > 100 IgG4 positive plasma cells/HPF and the ratio of CD138:IgG4 was > 40%Back to article page