title: Prenatal diagnosis and genetic analysis of double trisomy 48,XXX,+18.
abstract: Prenatal diagnosis of simultaneous occurrence of double trisomy involving chromosomes 18 and X is extremely rare. We report on the prenatal diagnosis, genetic analysis and clinical manifestations of a fetus with both trisomy 18 and trisomy X. A 26-year-old, para 1 woman was referred for genetic counselling at 36 weeks' gestation with the sonographic findings of intrauterine growth retardation (IUGR), polyhydramnios, ventricular septal defect, and an enlarged cisterna magna. Both cordocentesis and amniocentesis revealed a consistent karyotype of 48,XXX,+18. Quantitative fluorescent polymerase chain reaction using polymorphic small tandem repeat markers specific for chromosomes 18 and X rapidly determined that both aneuploidies arose as a result of non-disjunction in maternal meiosis II. Our case shows that two non-disjunction events can occur not only in the same parent, but also in the same cell division. Our case also shows that double trisomy, 48,XXX,+18, can demonstrate an enlarged cisterna magna, IUGR and polyhydramnios in prenatal ultrasound.
authors.affiliation: Department of Obstetrics and Gynecology, Mackay Memorial Hospital, Taipei, Taiwan, R.O.C. cpc-mmh@yahoo.com
authors.forename: C P
authors.initials: CP
authors.lastname: Chen
authors.forename: S R
authors.initials: SR
authors.lastname: Chern
authors.forename: L F
authors.initials: LF
authors.lastname: Yeh
authors.forename: W L
authors.initials: WL
authors.lastname: Chen
authors.forename: L F
authors.initials: LF
authors.lastname: Chen
authors.forename: W
authors.initials: W
authors.lastname: Wang
mesh_terms: D000328:Adult; D002887:Chromosomes, Human, Pair 18; D002946:Cisterna Magna / Q000002:abnormalities; D004247:DNA / Q000032:analysis; D005260:Female; D005312:Fetal Blood; D005317:Fetal Growth Retardation / Q000175:diagnosis; D005453:Fluorescence; D006345:Heart Septal Defects, Ventricular / Q000175:diagnosis; D006801:Humans; D007621:Karyotyping; D008297:Male; D018895:Microsatellite Repeats; D006831:Polyhydramnios / Q000175:diagnosis; D016133:Polymerase Chain Reaction; D011247:Pregnancy; D011296:Prenatal Diagnosis; D012729:Sex Chromosome Aberrations / Q000175:diagnosis* / Q000196:embryology / Q000235:genetics; D014314:Trisomy; D014960:X Chromosome
chemical_list: D004247:DNA