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According to paternal origin, triploidy can be classified into two phenotypes with distinct placental and sonographic findings. The most common type is diandric triploidy where chromosomes are of paternal origin, 80% of which are monospermic and 20% are dispermic.3 It is associated with a relatively well-grown fetus with either proportionate head size or slight microcephaly, increased nuchal translucency, and an enlarged and partially multicystic placenta with elevated levels of maternal serum beta human chorionic gonadotropin (β-hCG).4 The second type is digynic triploidy where the additional chromosomes are of maternal origin. It is characterised by severe fetal growth restriction, relative macrocephaly, and a small non-cystic placenta with decreased levels of β-hCG.5 Common structural defects in both types are syndactyly, adrenal hypoplasia and cardiac defects.

Twin pregnancy with triploidy and co-existing live twin progressing to viability: Case study and literature review