title: Twin-twin transfusion syndrome in a dizygotic monochorionic-diamniotic twin pregnancy.
abstract: We present a case of twin-twin transfusion syndrome with discordant gender. Monochorionicity was confirmed by surgical pathology. Cytogenetic analysis showed normal 46,XX and 46,XY karyotypes. Microsatellite analysis using reliable pericentromeric markers was consistent with dispermic fertilization of two separate ova. This suggests that monochorionicity, rather than zygosity, may be responsible for the development of placental vascular anastomoses.
authors.affiliation: Florida Institute for Fetal Diagnosis and Therapy, St. Joseph's Women's Hospital, Tampa, Florida, USA.
authors.forename: R A
authors.initials: RA
authors.lastname: Quintero
authors.forename: O T
authors.initials: OT
authors.lastname: Mueller
authors.forename: J M
authors.initials: JM
authors.lastname: Martínez
authors.forename: J
authors.initials: J
authors.lastname: Arroyo
authors.forename: E
authors.initials: E
authors.lastname: Gilbert-Barness
authors.forename: D
authors.initials: D
authors.lastname: Hilbelink
authors.forename: P
authors.initials: P
authors.lastname: Papenhausen
authors.forename: M
authors.initials: M
authors.lastname: Sutcliffe
mesh_terms: D000022:Abortion, Spontaneous; D000328:Adult; D003937:Diagnosis, Differential; D005260:Female; D005330:Fetofetal Transfusion / Q000175:diagnosis* / Q000601:surgery; D006801:Humans; D007621:Karyotyping; D008297:Male; D011247:Pregnancy; D011262:Pregnancy Trimester, Second; D011296:Prenatal Diagnosis; D014429:Twins, Dizygotic / Q000235:genetics*