Conjoined twins in a trichorionic quadruplet pregnancy after intracytoplasmic sperm injection and quarter laser-assisted zona thinning

Monozygotic twinning (MZT) and CTs could complicate multifetal pregnancies obtained by assisted reproduction techniques. The relationship between CTs, IVF, and AZH should be better studied to fully understand the mechanisms that lead to MZT (with the possible role of AZH) and CTs in MZT, in particular. Three-dimensional and four-dimensional ultrasound improve prenatal assessment of the condition. Selective embryo reduction is a safe procedure for the management of these pregnancies.