title: Double trisomy (48,XXY,+21) in monozygotic twins: case report and review of the literature.
abstract: The occurrence of double aneuploidy in the same individual is a relatively rare phenomenon. We describe twin newborns with typical clinical features of Down's syndrome, of which one revealed 48,XXY,+21 GTG-band karyotype. The second newborn died 2 days after its birth, and was clinically diagnosed having Down syndrome. Due to the same clinical features of the twins, the common placenta and amniotic sac, we speculate that they were monozygotics and as a result the second newborn should also be a Klinefelter. The purpose of this report is to present a rare case of possible coincidence of double aneuploidy in newborn twins. A review of the literature showed that double trisomy (48,XXY,+21) in a twin newborn infant has never occurred.
authors.affiliation: Laboratory of Cytogenetics, 2nd Department of Pediatrics, A.H.E.P.A. Hospital, School of Medicine, Aristotelian University of Thessaloniki, Thessaloniki, Greece. dimitrios.iliopoulos@jefferson.edu
authors.forename: Dimitrios
authors.initials: D
authors.lastname: Iliopoulos
authors.forename: George
authors.initials: G
authors.lastname: Poultsides
authors.forename: Vasiliki
authors.initials: V
authors.lastname: Peristeri
authors.forename: Georgia
authors.initials: G
authors.lastname: Kouri
authors.forename: Alexandros
authors.initials: A
authors.lastname: Andreou
authors.forename: Nikolaos
authors.initials: N
authors.lastname: Voyiatzis
mesh_terms: D002869:Chromosome Aberrations; D002891:Chromosomes, Human, Pair 21; D004200:Diseases in Twins / Q000235:genetics / Q000401:mortality; D004314:Down Syndrome / Q000235:genetics; D006801:Humans; D007231:Infant, Newborn; D007621:Karyotyping; D014314:Trisomy; D014430:Twins, Monozygotic / Q000235:genetics*