Unequal conjoined twins in which the parasite derives its blood supply from the placenta of the autosite. See: conjoined twins.
[omphalo- + G. angeion, vessel, + pagos, something fixed]

al·lan·toid·o·an·gi·op·a·gous twins

unequal monochorial twins with fusion of their allantoic vessels within the placenta; the lesser twin is essentially a parasite on the placental circulation of the larger twin.
Farlex Partner Medical Dictionary © Farlex 2012
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