It is usually held that there is a time continuum in the formation of monoxygotic (MZ) twins which is indexed by their placentation, running from dichorionic to monochorionic diamniotic to monochorionic monoamniotic and conjoined pairs. There is good evidence that this continuum is characterised by a continuum of predisposition to anencephaly, slightly raised in dichorionic pairs but very high ...

490 Segal, N. L. (2011). News, views, and comments. Twin Research and Human Genetics, 14, 490–493. DOI 10.1375/twin.14.5.490 The May 29, 2011 issue of the New York Times Magazine published a fascinating article concerning 4-year-old conjoined twins, Krista and Tatiana Simms. These craniopagus twins (joined at the cranium vault, but otherwise separate) were born to Felicia Simms, a 20year-old mo...

Conjoined twins have been a source of fascination to the public and the medical profession for centuries. Their birth was initially viewed as an ominous sign of impending disaster. Since Middle Ages into the 19th century they were regarded as monstrosities and were exhibited at circuses and sideshows. The frequency of conjoined twins is approximately 1 in 50,000 gestation, but many of them die ...

UNLABELLED OBJECTIVE To review the history, epidemiology, etiology, gestational aspects, diagnosis and prognosis of imperfect twinning. DATA SOURCES Scientific articles were searched in PubMed, SciELO and Lilacs databases, using the descriptors "conjoined twins", "multiple pregnancy", "ultrasound", "magnetic resonance imaging" and "prognosis". The research was not delimited to a specific period...

Conjoined twins are a very rare entity. It is associated with poor survival rate in the presence of vital organ sharing. The entity can be diagnosed as early as the first trimester. A conjoined twin diagnosed late in labor is a malady with high perinatal mortality and maternal morbidity. We present one such case of xiphopagus twins. The management of a case diagnosed late in labor can be very c...

Conjoined twins is a phenomenon believed to be caused by either delayed splitting of the fertilized ovum or fusion of the embryonic stem cells. Disorganization of mutant genes is believed to be a cause in some cases. We report a case of stillborn dicephalus tribrachius female conjoined twins with features that are not reported previously in the literature with a single umbilical artery and two ...