![]() Information from formal anatomic examinations of the sisters and their exploitative circus exhibitions is outlined with a view to explain relevant reproductive events. ![]() Although little information is known about their own birth, these conjoined twins paradoxically hold a unique place in the history of obstetrics. We describe the highly unusual circumstance of the Blazek sisters, an extreme developmental example of the terminal monogenital pygopagus type of conjoined twins in which one of the joined sisters conceived and underwent labor and childbirth. Of all the female conjoined twin sets either documented by medical authorities or referenced in ancient literary sources, in only one case were pregnancy and delivery successfully achieved by the conjoined twins themselves. Although several conjoined male twins have occasionally been reported, for unexplained reasons most cases of conjoined twins are female. ![]() Conjoined twins represent the most uncommon twinning mechanism in humans, with an incidence approaching 1:100,000 deliveries. ![]()
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