craniopagus parasiticus

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cra·ni·op·a·gus pa·ra·si·t'i·cus

a variety of craniopagus in which one fetus is rudimentary in form and parasitic on the other.
See also: epicomus.
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References in periodicals archive ?
Parasitic twin, also known as craniopagus parasiticus, are formed the same way as conjoined twins during the early stages of pregnancy.
The condition, craniopagus parasiticus, is so rare that there have only been eight cases.