Laser therapy for twin–twin transfusion syndrome in a dizygo
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A monochorionic dizygotic (MCDZ) twin is rare, especially when complicated with twin-twin transfusion syndrome (TTTS) and treated by laser therapy.

A pregnancy achieved from oocyte donation and intracytoplasmic sperm injection resulted in two embryos transferred. Monochorionic diamniotic twin pregnancy was diagnosed by an early ultrasound; however, at 16 weeks of gestation, instead of the same sex, the ultrasound suspected there was a sex discrepancy between the twins.

TTTS with severe polyhydramnios occurred at 22 weeks, leading to laser therapy, which was followed by a smooth post-operation course. Then the Cesarean section was performed at the gestational age of 29 weeks due to severe preeclampsia, giving birth to two live newborns: one female and one male baby both without neurological sequelae at the time of discharge. Blood chromosomes obtained at delivery and 65 days after delivery all revealed an XX and XY chimera from both babies.

Laser therapy is also effective in MCDZ twin complicated with TTTS. Determination of chorionicity in early pregnancy could timely prompt us to watch out for complications unique to monochorionic twin pregnancy.

Taiwanese Journal of Obstetrics and Gynecology
Source: https://doi.org/10.1016/j.tjog.2021.05.039
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