title: Intracranial mixed germ cell tumor with syncytiotrophoblastic giant cells and precocious puberty.
abstract: A 9-year-old male patient developed a germ cell tumor in the right basal ganglia which secreted beta-human chorionic gonadotropin (beta-HCG) and caused precocious puberty. Histology and immunohistochemical staining for placental alkaline phosphatase (PLAP), alpha-fetoprotein (alpha-FP), and beta-HCG showed a mixed population of neoplastic germinocytes, embryonal carcinoma, and syncytiotrophoblastic giant cells (STGC). Immunohistochemical double-staining for alpha-FP and beta-HCG revealed that these two markers were produced by different subsets of cells. Expression of the proliferation marker Ki-67 showed a growth fraction of 53% for the neoplastic germinocytes and embryonal carcinoma cells, but only 21% for the STGC.
mesh_terms: D000469:Alkaline Phosphatase / Q000032:analysis; D001932:Brain Neoplasms / Q000032:analysis / Q000150:complications / Q000473:pathology*; D002648:Child; D006063:Chorionic Gonadotropin / Q000032:analysis; D006801:Humans; D008297:Male; D009373:Neoplasms, Germ Cell and Embryonal / Q000032:analysis / Q000150:complications / Q000473:pathology*; D011629:Puberty, Precocious / Q000209:etiology*; D000509:alpha-Fetoproteins / Q000032:analysis
chemical_list: D006063:Chorionic Gonadotropin; D000509:alpha-Fetoproteins; D000469:Alkaline Phosphatase