Fig. 2
From: IgG4-related mastitis managed without excision or steroid therapy
Pathological findings of the biopsy specimen of the breast. A This micrograph is taken at 400 × magnification and stained with hematoxylin and eosin (→: plasma cells). B CD138 immunostaining showed numerous plasma cell infiltrates. C, D Infiltration of several plasma cells is noted. Pathological findings reveal high IgG4-positive plasma cell infiltration (115 cells/1 HPF). IgG-positive plasma cell was 182 cells/1 HPF, and the IgG4/IgG rate is 63% (115/182)