title: Plurihormonal gonadotroph cell pituitary adenoma: report of a unique case.
abstract: OBJECTIVE
  Pituitary adenomas producing primarily FSH and to a lesser extent GH, LH, alpha-subunit, TSH and PRL without clinical or laboratory evidence of increased hormone release have not previously been reported. Our aim was to obtain some insight into the possible cytogenesis of this unusual tumor.
  
  
  METHODS
  A 65-year-old woman presented with headaches. Magnetic resonance imaging (MRI) demonstrated a sellar mass. Pituitary hormone assays showed normal blood levels. The tumor was removed by the transsphenoidal approach.
  
  
  RESULTS
  By light microscopy, the adenoma was chromophobic, weakly PAS-positive, and immunoreactive mainly for FSH (85%) and to a lesser extent for GH (30%), LH (15%), alpha-subunit (3%), TSH (2%), and PRL (1%). Although double immunostaining showed hormone reactivities to be localized largely in separate distinct cells, the tumor was ultrastructurally monomorphous, i.e., consisted of a single-cell type, resembling gonadotrophs.
  
  
  CONCLUSIONS
  The cytogenesis of plurihormonal pituitary adenomas is not fully understood. Further investigations are required to clarify the basis for their plurihormonality despite an ultrastructural gonadotroph phenotype.
authors.affiliation: Department of Laboratory Medicine, St. Michael's Hospital, Ontario, Canada.
authors.forename: M
authors.initials: M
authors.lastname: Al-Shraim
authors.forename: M
authors.initials: M
authors.lastname: Al-Sharim
authors.forename: B W
authors.initials: BW
authors.lastname: Scheithauer
authors.forename: E
authors.initials: E
authors.lastname: Horvath
authors.forename: K
authors.initials: K
authors.lastname: Kovacs
authors.forename: H
authors.initials: H
authors.lastname: Smyth
authors.forename: C
authors.initials: C
authors.lastname: Coire
authors.forename: R V
authors.initials: RV
authors.lastname: Lloyd
authors.forename: R
authors.initials: R
authors.lastname: Jastania
authors.forename: M
authors.initials: M
authors.lastname: Al-Gahtany
mesh_terms: D000236:Adenoma / Q000378:metabolism* / Q000473:pathology* / Q000503:physiopathology; D000368:Aged; D005260:Female; D005640:Follicle Stimulating Hormone / Q000096:biosynthesis; D052681:Gonadotrophs / Q000378:metabolism* / Q000473:pathology*; D013006:Growth Hormone / Q000096:biosynthesis; D006801:Humans; D007150:Immunohistochemistry; D008279:Magnetic Resonance Imaging; D010911:Pituitary Neoplasms / Q000378:metabolism* / Q000473:pathology* / Q000503:physiopathology; D011388:Prolactin / Q000096:biosynthesis; D013972:Thyrotropin / Q000096:biosynthesis
chemical_list: D011388:Prolactin; D005640:Follicle Stimulating Hormone; D013972:Thyrotropin; D013006:Growth Hormone