Figure 8From: Paratesticular fibrous pseudotumor in young males presenting with histological features of IgG4-related disease: two case reports Histological section: immunohistochemical staining of immunoglobulin G. (a) Note the dense infiltrate of plasma cells (brownish-stained). (b) Note the large proportion of immunoglobulin G4-positive plasma cells. Immunoglobulin G4, original ×200.Back to article page