?头颅连胎
费莉西亚怀孕5个月后费莉西亚接受了超声波检查，结果发现这对双胞胎患了一种名为头颅连胎(Craniopagus)的怪病。自这对连体婴出生以来，她不断收到邮件，对她进行指责。
?颅部连胎
颅部连胎（Craniopagus）：占总病例的6%及2%。
头联双胎
枕颅联胎
顶颅联胎
Conjoined twins are very rare - only one in every 2.5 million births - and only 5% of conjoined twins are craniopagus, which means they are fused at the head.
BBC: Conjoined twins separated by Great Ormond Street doctors
craniopagus:
German Kraniopagus
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