Congenital malformations occur more frequently in twin gestations. Reportedly the frequency of anomalies in twin pregnancies ranges between 1.5 and 3.0 times higher than those in singletons. In monozygotic (MZ) twin pregnancies the percentage of at least one twin affected by anomalies may approach 30±70% 1 .We present a case of a dichorionic±diamniotic triplet pregnancy in which the monoamniotic twin pair had concordant anomalies: liver and bowel containing omphalocele and bladder exstrophy, most probably cloacal anomaly, detected at 10 postmenstrual weeks and 3 days.The available world literature (PubMed) was reviewed through the electronic media.
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