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Conjoined twins occur when, in the early stages of development, an embryo only partially separates to form two babies. Conjoined twins are rare, occurring in about one out of every 200,000 live Author: CBS News. Nov 15, 2011 · Conjoined twins (CT) are a very rare developmental accident of uncertain etiology. Prevalence has been previously estimated to be 1 in 50,000 to 1 in 100,000 births. The process by which monozygotic twins do not fully separate but form CT is not well Cited by: 69.

Mar 10, 2011 · A conjoined twin is one of the rare congenital defects. Ischiopagus variety is even rarer. We present a case of ischiopagus-tripus conjoined twins. They were fused at the lower halves of the bodies. One of the twins was apparently normal looking, active and pink. The other twin was small, ill. Conjoined twins are identical twins joined in utero.An extremely rare phenomenon, the occurrence is estimated to range from 1 in 49,000 births to 1 in 189,000 births, with a somewhat higher incidence in Southwest Asia and Africa. Approximately half are stillborn, and an additional one-third die within 24 hours.Most live births are female, with a ratio of 3:1.Specialty: Medical genetics.

Conjoined twins are rare, occurring in about one out of every 200,000 live births, experts say. Indonesia, on Feb. 26, 2004. Born via caesarian section, these twins shared an anus, genitalia Author: CBS News. In fact, they share part of the same digestive tract and portions of their anus. Like most surgeries which involve the separation of conjoined twins, it is an extremely risky and difficult operation.

Conjoined twins are classified on the basis of the union's site, with the suffix pagus meaning fixed or fastened. The twins can have four (tetrapus), three (tripus), or two (bipus) legs. The classification of conjoined twins, limited to eight types with approximate percentages of frequency, is .