title: XO/XY mosaicism in delayed puberty.
abstract: Two adolescent boys with 45,X/46,XY (XO/XY mosaicism), presented in adolescence with pubertal delay and short stature. Both patients had a history of hypospadias repair, but otherwise normal male genitalia. Scrotal testes were present bilaterally, and no Müllerian structures were identified by pelvic ultrasound. The XO/XY mosaicism suggests that this chromosomal abnormality might be more common in phenotypic males than previously recognized. Because of the increased incidence of testicular neoplasia in patients with XO/XY mosaicism, it is important to document this chromosomal abnormality. We recommend cytogenetic analyses for boys with pubertal delay and hypospadias. If XO/XY mosaicism is documented, the patient must be closely followed for possible development of testicular failure and/or gonadoblastoma.
authors.affiliation: Department of Pediatrics, College of Physicians and Surgeons, Columbia University, New York, NY 10032.
authors.forename: G S
authors.initials: GS
authors.lastname: Aranoff
authors.forename: A
authors.initials: A
authors.lastname: Morishima
mesh_terms: D000293:Adolescent; D006059:Gonadal Dysgenesis / Q000150:complications / Q000235:genetics*; D006801:Humans; D007021:Hypospadias / Q000235:genetics; D008297:Male; D009030:Mosaicism; D010641:Phenotype; D011628:Puberty, Delayed / Q000209:etiology / Q000235:genetics*