omphalosite(redirected from placental parasitic twin)
the underdeveloped parasitic member of pair of monochorionic twins, joined to the more developed member (autosite) by the vessels of the umbilical cord and not capable of sustaining life after separation from the placenta.
Underdeveloped twin of allantoidangiopagous twins; joined by umbilical vessels.
Synonym(s): placental parasitic twin
[omphalo- + G. sitos, food]
Etymology: Gk, omphalos + sitos, food
the underdeveloped parasitic member of unequal conjoined twins united by the vessels of the umbilical cord. The omphalosite has no heart, derives its blood supply from the placenta of the autosite, and is incapable of independent existence after birth. See also allantoidoangiopagus.
the underdeveloped member of allantoidoangiopagous twins, joined to the more developed member (autosite) by the vessels of the umbilical cord.