Natural life authorities say they have never seen a deformation like that however have presented a few hypotheses. One clarification set forth is that it might be a conjoined that passed on in the womb and its leftovers converged into the other twin. Another clarification is a supposed "teratoma" tumor.
This sort of anomaly, whose Greek name means "creature tumor," can develop teeth and hair. In people, it can develop fingers and toes.