A vanishing twin, also called twin embolisation syndrome' or foetus papiricus, is the term for a fetus who is partially or completely reabsorbed during the pregnancy, as opposed to a normal birth or a miscarriage. The International Classification of Diseases for Oncology (ICD-O) is a domain specific extension of the International Statistical Classification of Diseases and Related Health Problems for tumor diseases. ... The following codes are used with International Statistical Classification of Diseases and Related Health Problems. ... The following is a list of codes for International Statistical Classification of Diseases and Related Health Problems. ... Fetus at eight weeks Foetus redirects here. ...

One theory for the creation of a vanishing twin is due to an atypical fertilization process. Fraternal twins usually develop by the fertilization of two ova by two sperm each of which grow in one common sac within the womb. This is called dizygotic monochorionic twins. Vanishing twin is thought to occur when two difference sacs are formed causing one, the vanishing twin, to be squished flat as it is out competed for space by the other twin. Categories: Biology stubs ... Fraternal twin boys in the tub The term twin most notably refers to two individuals (or one of two individuals) who have shared the same uterus (womb) and usually, but not necessarily, born on the same day. ... A human ovum An ovum (loosely, egg or egg cell) is a female sex cell or gamete. ... The signifier sperm can refer to: (mass noun, from Greek sperma = seed) a substance which consists of spermatozoa and which is a component of semen (mass noun) semen itself (informally, count noun with plural sperm or sperms) a single spermatozoon (= sperm cell) sperma ceti (Latin ceti, genitive of cetus = whale... Female internal reproductive anatomy The uterus or womb is the major female reproductive organ of most mammals, including humans. ... Fraternal twin boys in the tub Twin births occur in most species. ...

According to some researchers, vanishing twins occur in up to one out of every eight pregnancies and may not even be known in most cases. In other cases, the vanished twin appears to be painted on a [[translucent sheath of skin delivered with the birth of the surviving baby. The twin is lifeless form with what could be described as a 'fossilized' look. This may not affect the birth of the live baby at all. However, there are other cases where the vanishing twin can create further complications in the pregnancy like slow growth of the fetus and premature deliveries. Since it hypothesized that some instances of vanished twins leave no detectable trace, it is impossible to say for certain how frequent the phenomenon is. Logically, something that is asserted to leave no trace cannot be proven or disproven to exist. Pregnancy Pregnancy is the carrying of one or more embryos or fetuses by female mammals, including humans, inside their bodies. ... For information on the U.S. borough, see Paint, Pennsylvania. ... Model of the layers of human skin In zootomy and dermatology, skin is an organ of the integumentary system composed of a layer of tissues that protect underlying muscles and organs. ... Birth is the process in animals by which an offspring is expelled from the body of its mother. ... The term baby can refer to: an infant a very early computer—the Small-Scale Experimental Machine, nicknamed Baby a musician – Brian Williams – who performs under the name Baby. ...

The Vanishing Twin Syndrome has been cited by biotech company Acu-Gen as an ad hoc hypothesis to explain false results of the company's Baby Gender Mentor test. According to the company, on occasions where their pregnancy gender test has apparently given the incorrect gender of the fetus, the apparent mistake can be explained by a fetus having been present at the time of testing, but later being reabsorbed as a vanished twin. Ad hoc is a Latin phrase which means for this [purpose]. It generally signifies a solution that has been tailored to a specific purpose, such as a tailor-made suit, a handcrafted network protocol, and specific-purpose equation and things like that. ... This article needs to be cleaned up to conform to a higher standard of quality. ...

It has been speculated that the children born in such a pregnancy may have some memories of their vanishing twins, and may feel lonely because of this. There is no scientific evidence to support this claim. Researchers of the paranormal, such as George Noory's talkshow Coast to Coast, have discussed the alleged phenomenon.

A wombtwin is a term used since 2003 to describe an embryo or fetus that was a member of a twin pair or triplet set and who died in the womb. The loss of a twin very early in pregnancy has been called "vanishing twin" phenomenon since the 1980s when twin pregnancies were made visible by means of ultrasound (sonograph) scanning. Two developing gestational sacs are seen at the first ultrasound scan but only one is visible at the second scan. The wombtwin dies owing to a poorly implanted placenta; a developmental anomaly that may cause major organs to fail or be missing completely; there may be a chromosome abnormality incompatible with life. Frequently the twin is a blighted ovum, that never developed beyond the very earliest stages of embryogenesis. Embryos (and one tadpole) of the wrinkled frog (Rana rugosa). ... Fetus at eight weeks Foetus redirects here. ... A triplet is a set of three items, and includes in particular: one of three babies in a multiple birth a preparation of opal as a gemstone, with a thin layer of opal backed with a dark material and covered with cap of clear quartz in poetry, a tercet (three... Female internal reproductive anatomy The uterus or womb is the major female reproductive organ of most mammals, including humans. ... Fraternal twin boys in the tub Twin births occur in most species. ... A baby in its mothers womb, viewed in a sonogram Ultrasound is sound with a frequency greater than the upper limit of human hearing, approximately 20 kilohertz/20,000 Hertz. ... The placenta is an ephemeral (temporary) organ present only in female placental mammals during gestation (pregnancy). ... Figure 1: Chromosome. ... An anembryonic gestation (aka blighted ovum) is a pregnancy in which a visible embryo never develops within a normal-appearing gestational sac, which likely occurs as a result of early embryonic death with continued development of the trophoblast. ... Embryogenesis is the process by which the embryo is formed and develops. ...

See also

• Wombtwin Survivor

This article does not cite its references or sources. ...

External links

• Wombtwin Survival Research and Stories
• Vanishing twin occurrence in India