Craniopagus parasiticus

Craniopagus parasiticus
Drawing of a skull of a child born in 1783 in Bengal, affected by craniopagus parasiticus

Craniopagus parasiticus is an extremely rare type of parasitic twinning occurring in about 4 to 6 of 10,000,000 births. In craniopagus parasiticus, a parasitic twin head with an undeveloped body is attached to the head of a developed twin. Fewer than a dozen cases of this type of conjoined twin have been documented in literature.

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