title: Etiologies of late puberty.
abstract: An expected lack of pubertal development can be due to an already diagnosed disease. The diagnosis of an unexpected lack of puberty is a difficult task. We have analyzed the etiologies of late puberty in 106 adolescents: 68 boys aged over 15 years and 38 phenotypic girls aged over 13 years. According to their clinical and biological (gonadotropin) data, they were classified in 3 groups. In the first group, hypergonadotropism was observed only in 19 females; pure gonadal dysgenesis was found in 2 cases with 46,XY, in 2 with 46,Xdel(Xq) karyotypes and 9 cases were 46,XX constitutions; 2 sisters had also blepharophimosis; in 3 cases the ovarian failure was due to autoimmune disease, and 1 case, genetically male, had 17 alpha-hydroxylase deficiency. The second group had gonadotropin insufficiency and consisted of 68 adolescents, 57 males and 11 females, with low gonadotropin levels: 33 were anosmic; in the boys, cryptorchism was present in 68% and micropenis in 31%; 38 had a familial history of hypogonadism, the transmission of which was matrilineal in 16, patrilineal in 13 and recessive autosomal in 7. The third group had low or low-normal gonadotropin levels: 22 cases of constitutional delay of puberty (11 cases in both sexes), demonstrated by further normal puberty during the follow-up. No clinical marker and familial history in 50% were noted.
authors.affiliation: Hôpital Saint-Vincent-de-Paul, Paris, France.
authors.forename: J E
authors.initials: JE
authors.lastname: Toublanc
authors.forename: M
authors.initials: M
authors.lastname: Roger
authors.forename: J L
authors.initials: JL
authors.lastname: Chaussain
mesh_terms: D000293:Adolescent; D002648:Child; D005260:Female; D005640:Follicle Stimulating Hormone / Q000097:blood; D007987:Gonadotropin-Releasing Hormone; D006801:Humans; D007006:Hypogonadism / Q000150:complications; D007621:Karyotyping; D007986:Luteinizing Hormone / Q000097:blood; D008297:Male; D011628:Puberty, Delayed / Q000209:etiology* / Q000235:genetics
chemical_list: D007987:Gonadotropin-Releasing Hormone; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone