Fig. 2

Histopathology images of pituitary biopsy. (A) H&E staining at 200x magnification showing dense reactive fibrosis and plasma cells identifiable by the presence of a perinuclear hof. (B) IgG4 staining. IgG4 stains often have high background and can be difficult to interpret [6]. This stain was interpreted as negative for IgG4- related disease