Dipygus

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Myrtle Corbin, a famous dipygus.
Piglet with dipygus at Ukrainian National Chernobyl Museum in Kiev

The dipygus deformity is a severe congenital deformity where the body axis forks left-and-right partway along the torso with the posterior end (pelvis and legs) duplicated. Myrtle Corbin was a dipygus; she married and had 5 children. In human cases the inner two of the four hindquarters develop much smaller than normal. This is a type of "teras catadidymum" ("monster twinned below").

Another sort of deformity with extra legs can happen from a degenerated conjoined twin, as may have happened with Frank Lentini with his third leg.

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