Figure 3From: Hyper-IgG4 disease: report and characterisation of a new disease Retroperitoneal tissue. Patient 7. Pre-glucocorticoid treatment: (a) fibrosis and plasma cells (haematoxylin and eosin ×400); (b) IgG4-positive plasma cells. Post-glucocorticoid treatment: (c) scattered CD138-positive plasma cells; (d) IgG4 staining reveals no positive cells.Back to article page