Monozygotic twins in infertile patients with advanced maternal age: case reports and review of the literature.

Objective: To report two cases of successful monozygotic twin pregnancies in women undergoing infertility treatment and to review possible etiologic factors.

Design: Case report and review of the literature.

Setting: University of Toronto-affiliated infertility clinic.

Don't judge a book by its cover; a quintuplet pregnancy following transfer of five poor-quality embryos.

Objective: To report a case of a quintuplet pregnancy following transfer of five poor-quality cellular-stage embryos.

Design: Case report.

Setting: University of Toronto-affiliated infertility clinic.

Ongoing twin pregnancy after rescue intracytoplasmic sperm injection of unfertilized abnormal oocytes.

Objective: To report a case of an ongoing twin pregnancy resulting from rescue intracytoplasmic sperm injection (ICSI) after failed fertilization of morphologically abnormal oocytes.

Design: Case report.

Setting: Tertiary center for assisted reproductive technology (ART).

Seminal hyperviscosity is associated with poor outcome of in vitro fertilization and embryo transfer: a prospective study.

Objective: To investigate the effect of increased seminal viscosity on fertilization, implantation, and pregnancy outcome in patients undergoing in vitro fertilization/ intracytoplasmic sperm injection (ICSI).

Design: Prospective study.

Setting: University-affiliated infertility center.

Successful pregnancy following double-frozen embryo transfer in a patient with repeated implantation failure.

Objective: To report a case of successful singleton pregnancy following a novel technique of sequential double transfer of two groups of frozen embryos at the same developmental stage (8-cell) at 5 and 7 days after the LH surge to a patient with seven previous failed assisted reproductive technology (ART) cycles.

Design: Case report.

Setting: University of Toronto affiliated infertility clinic.