BACKGROUND Monozygotic (MZ) twins are believed to arise from the fission of a single
fertilized embryo at different stages. Monochorionic MZ twins, who share one chorion …

STUDY QUESTION Are all twin births following single embryo transfer (SET) monozygotic?
SUMMARY ANSWER Between 1 in 10 and in 1 in 5 twins born after SET are the result of a …

Assisted reproduction is presumed to increase monozygotic twin rates, with the possible
contribution of laboratory and medical interventions. Monozygotic dichorionic gestations are …

There is a long-held credo, as illustrated in Langman's Medical Embryology (11th ed.,
Sadler, 2010), that dichorionic diamniotic (DD) twins develop after embryo splitting in the …

Objective: To compare the live birth rate, multiple pregnancy rate, and obstetric outcomes of
elective single and double embryo transfers. Design: Case series with internal comparisons …

Elective single embryo transfer (SET) is a reasonable option for avoiding multiple
pregnancies in patients who undergo assisted reproductive technology (ART) treatment [1 …

Background In addition to the potential for multiple pregnancies, natural conception
occurring in preimplantation genetic testing (PGT) increases undesired genetic risk. Some …

A heterotopic pregnancy is a rare and serious pathological pregnancy. In this paper, we
report a rare case of heterotopic pregnancy and perform a literature review. A 30-year-old …

Heterotopic pregnancy (HP) is a rare but life‐threatening disease. We report a rare case of
HP that occurred after single embryo transfer (SET) with spontaneous natural pregnancy …

A rare case of a heterotopic pregnancy after single embryo and blastocyst transfer is
presented. A couple suffered from idiopathic infertility and underwent assisted reproduction …