Parasitic Twin

Parasitic Twins  (also known as an asymmetrical or unequal conjoined twin) is the result of the processes that produce vanishing twins and conjoined twins, and may represent a continuum between the two. Parasitic twins occur when a twin embryo begins developing in utero, but the pair does not fully separate, and one embryo maintains dominant development at the expense of the other. Unlike conjoined twins, one ceases development during gestation and isvestigial to a mostly fully formed, otherwise healthy individual twin. The undeveloped twin is defined as parasitic, rather than conjoined, because it is incompletely formed or wholly dependent on the body functions of the complete fetus. (Adapted from Wikipedia)

Craniopagus parasiticus is a general term for a parasitic head attached to the head of a more fully developed fetus or infant. (Wikipedia)

parasitic and conjoined twins external link

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