Figure 2.

Operative procedure and histologic findings of the tumor. (A) Exploratory pituitary surgery was performed; a microadenoma (arrow) was found in the center of the pituitary gland. (B) Selective complete tumor resection was performed. On immunohistochemical analysis, most adenoma cells were immunopositive for follicle-stimulating hormone-β, as seen on 3,3′-diaminobenzidine staining (C), although some scattered cells were immunonegative for luteinizing hormone-β (D).