The dipygus deformity is a severe congenital deformity where the body axis forks left-and-right partway along the torso

Torso

Trunk or torso is an anatomical term for the central part of the many animal bodies from which extend the neck and limbs. The trunk includes the thorax and abdomen.-Major organs:...

 with the posterior end (pelvis and legs) duplicated. Myrtle Corbin

Myrtle Corbin

Josephene Myrtle Corbin was born a dipygus, meaning that she had two separate pelvises side by side from the waist down, as a result of her body axis splitting as it developed. Each of her smaller inner legs was paired with one of her outer legs...

 was a dipygus; she married and had 5 children and lived to age 59 or 60. In human cases the inner two of the four hindquarters develop much smaller than normal. This is a type of "teras catadidymum" ("monster

Teratology

Teratology is the study of abnormalities of physiological development. It is often thought of as the study of human birth defects, but it is much broader than that, taking in other non-birth developmental stages, including puberty; and other non-human life forms, including plants.- Etymology :The...

 twinned below").

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

Frank Lentini

Francesco Lentini was born at Rosolini, near Syracuse, Sicily into a family of twelve children.He was born with three legs, two sets of genitals and one rudimentary foot growing from the knee of his third leg...

 with his third leg.

External links

• Dipygus deer fawn
• Probable dipygus dog at Port Klang
  Port Klang
  Port Klang is a town and the main gateway by sea into Malaysia. Colonially known as Port Swettenham, it is also the location of the largest and busiest port in the country. As such, its economic progress has been greatly influenced by the port activities in its area...
  
  in Malaya