title: Monozygotic twins following blastocyst transfer: a report of two cases.
abstract: Several studies have shown an increased risk for monozygotic twinning after fertilization treatments. We present the clinical and sonographic characteristics of two monozygotic twin cases following blastocyst transfer. It is suggested that delayed transfer of the embryo in the blastocyst stage is a contributing factor to monozygotic twinning.
authors.affiliation: Fertility & IVF Unit, Department of Obstetrics and Gynecology, Soroka University Medical Center and Faculty of Health Sciences, Ben Gurion University of the Negev, Beer-Sheva, Israel.
authors.forename: E
authors.initials: E
authors.lastname: Sheiner
authors.forename: Z
authors.initials: Z
authors.lastname: Kivilevitch
authors.forename: E
authors.initials: E
authors.lastname: Levitas
authors.forename: Y
authors.initials: Y
authors.lastname: Sonin
authors.forename: S
authors.initials: S
authors.lastname: Albotiano
authors.forename: I
authors.initials: I
authors.lastname: Har-Vardi
mesh_terms: D000328:Adult; D001755:Blastocyst; D004624:Embryo Transfer; D005260:Female; D005307:Fertilization in Vitro; D006801:Humans; D011247:Pregnancy; D011272:Pregnancy, Multiple; D020554:Sperm Injections, Intracytoplasmic; D014430:Twins, Monozygotic; D016216:Ultrasonography, Prenatal