Fig. 3

Case 1. a Photomicrograph showing smooth transition from single columnar epithelium to stratified squamous epithelia, original magnification ×100. b High-power photomicrograph showing involvement of the pituitary gland in sub-epithelial inflammatory granulation. Most infiltrated cells were lymphocytes and plasma cells, original magnification ×200. c Inflammatory cells had frequently infiltrated into the arachnoid and neuroglial tissues, original magnification ×100. d Significant angiogenesis is present, original magnification ×100. Hematoxylin and eosin staining