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KMID : 1201620090020030116
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Journal of Women s Medicine
2009 Volume.2 No. 3 p.116 ~ p.120
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Monochorionic diamniotic twins of different sex
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Kim Suk-Young
Ahn So-Young
Lee Soon-Pyo
Hwang Byung-Cheul
Park Young-Keun
Park Jong-Min
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Abstract
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A 25-year-old primigravida at 12 weeks gestation was referred for evaluation of edematous changes in one of two fetuses. The ultrasonographic findings included increased nuchal translucency (NT; 0.91 cm) with ascites and a pleural effusion, which were consistent with fetal hydrops. There was a single monochorionic diamniotic placenta. The results of an amniocentesis were 46, XY (normal karyotype) and 45, XO (Turner syndrome). On ultrasonography after the amniocentesis, the fetuses were shown to be of different genders. At 20 weeks 3 days, the hydropic changes had progressed, including the ascites, pleural effusion, and skin edema. After a thorough discussion of the condition of the fetus with the parents, the decision was made to discontinue the pregnancy. A 400 g non-viable male and a 670 g non-viable female were delivered. The male had no gross abnormalities, but the female showed severe hydropic changes. On pathologic examination, a monochorionic diamniotic placenta was confirmed. There have been reports that due to genetic defects in the embryo itself or embryo manipulation by assisted reproductive technology, twins have been diagnosed with a monochorionic placenta, but of different gender on prenatal ultrasonography. We managed twins who had been diagnosed prenatally as monochorionic, but were of different gender, which we report with a brief review of the literature.
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KEYWORD
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Monochorionic diamniotic twin, Turner syndrome, Gender
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