Siamese twins


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Siamese twins

 [si″ah-mēz´]
monozygotic twins whose bodies are joined. The connection may be slight or extensive; it may involve skin and muscles or cartilage of a limited region, such as the head, chest, hip, or buttock, or the twins may share an organ, such as an intestine or parts of the spine. If joined superficially, the twins may be easily separated by surgery soon after birth. If more deeply united, they may have to go through life with their handicap, if they survive. New techniques in surgery are making it possible to separate some Siamese twins whose physical links are highly complex. Called also conjoined twins

Si·a·mese twins

originally, a much-publicized conjoined pair of twins (xiphopagus) born in Siam (present-day Thailand) in the 19th century; this term has since come into general lay usage for any type of conjoined twins, but is incorrect.
A joined gestational product resulting from a failure in division of the yolk sac or delayed monovular separation. Conjoined twins occur in ±1:200,000 term deliveries; most are joined at the chest—thoracopagus
Prognosis Depends on the need for or adequacy of surgical separation

'Siamese' twins

Conjoined equal twins A joined gestational product due to a failure in division of the yolk sac or due to delayed monovular separation; STs occur in ±1:200,000 term deliveries; most are joined at the chest–thoracopagus Prognosis Depends on adequacy of surgical separation

Si·a·mese twins

(sī'ă-mēz' twinz)
A much publicized pair of conjoined twins born in Thailand (then Siam) in the 19th century; this term has since come into general lay usage for any type of conjoined twins.

Siamese twins

Identical (monozygous) twins that have failed fully to separate after the first division of the ovum and remain partially joined together at birth. The junction is usually along the trunk or between the two heads. From the male twins, Chang and Eng, born in Siam in 1811.

Siamese twins,

named for Eng and Chang (1811-1874) who were born in Siam (now Thailand).
References in periodicals archive ?
Ahmed Al-Feriyan, Consultant of neurosurgery and head of the medical team to participate in the Syrian Siamese twin separation surgery.
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SIAMESE twins Courtney and Natasha Smith have little chance of survival, doctors warned last night.
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Tiny four-day-old Scots Siamese twins were last night fighting for life in hospital.