iliothoracopagus

il·i·o·thor·a·cop·a·gus

(il'ē-ō-thōr'ă-kop'ă-gŭs),
Conjoined twins in which union occurs through the ilia and extends to involve the thoraces. See: conjoined twins.
Synonym(s): ischiothoracopagus
[ilio- + G. thorax, chest, + pagos, fixed]

iliothoracopagus

(ĭl″ē-ō-thō″ră-kōp′ă-gŭs) [″ + Gr. thorax, chest, + pagos, thing fixed]
Twins joined from pelvis to thorax.