title: Mediastinal teratoma and precocious puberty in a boy with mosaic Klinefelter syndrome.
abstract: We describe a boy who developed precocious puberty resulting from chorionic gonadotropin produced by a mediastinal germ cell tumor. Following tumor removal he began spontaneous precocious sexual development which was treated and then arrested spontaneously. Investigation of this arrested puberty established that he had Klinefelter syndrome (KS) mosaicism. He represents the first instance of KS mosaicism reported with a mediastinal germ cell tumor, a neoplasm commonly reported in males with a 47,XXY karyotype. We recommend that all males with KS and early sexual development or with "normal" testicular growth be screened with measurement of germ cell tumor markers including beta-subunit of human chorionic gonadotropin and alpha-fetoprotein.
authors.affiliation: Department of Pediatrics, University of California in San Diego, La Jolla, USA.
authors.forename: A N
authors.initials: AN
authors.lastname: Derenoncourt
authors.forename: M
authors.initials: M
authors.lastname: Castro-Magana
authors.forename: K L
authors.initials: KL
authors.lastname: Jones
mesh_terms: D002648:Child; D006063:Chorionic Gonadotropin / Q000097:blood; D018997:Chorionic Gonadotropin, beta Subunit, Human; D018237:Germinoma / Q000150:complications* / Q000000981:diagnostic imaging / Q000473:pathology; D006801:Humans; D007713:Klinefelter Syndrome / Q000097:blood / Q000150:complications* / Q000235:genetics; D008297:Male; D008479:Mediastinal Neoplasms / Q000150:complications* / Q000000981:diagnostic imaging / Q000473:pathology; D009030:Mosaicism; D010446:Peptide Fragments / Q000097:blood; D011629:Puberty, Precocious / Q000209:etiology*; D011859:Radiography; D013724:Teratoma / Q000150:complications* / Q000000981:diagnostic imaging / Q000473:pathology
chemical_list: D006063:Chorionic Gonadotropin; D018997:Chorionic Gonadotropin, beta Subunit, Human; D010446:Peptide Fragments