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  2. Monochorionic twins - Wikipedia

    en.wikipedia.org/wiki/Monochorionic_twins

    The presence of a "T-sign" at the inter-twin membrane-placental junction is indicative of monochorionic-diamniotic twins (that is, the junction between the inter-twin membrane and the external rim forms a right angle), whereas dichorionic twins present with a "lambda (λ) sign" (that is, the chorion forms a wedge-shaped protrusion into the ...

  3. Monoamniotic twins - Wikipedia

    en.wikipedia.org/wiki/Monoamniotic_twins

    Monoamniotic twins are always monochorionic and are usually termed Monoamniotic-Monochorionic ("MoMo" or "Mono Mono") twins. [1] [2] They share the placenta, but have two separate umbilical cords. Monoamniotic twins develop when an embryo does not split until after formation of the amniotic sac, [1] at about 9–13 days after fertilization. [3]

  4. Fetus in fetu - Wikipedia

    en.wikipedia.org/wiki/Fetus_in_fetu

    [1] There are two hypotheses for the origin of a fetus in fetu. One hypothesis is that the mass begins as a normal fetus but becomes enveloped inside its twin. [2] The other hypothesis is that the mass is a highly developed teratoma. Fetus in fetu is estimated to occur in 1 in 500,000 live births. [3]

  5. Amniotic sac - Wikipedia

    en.wikipedia.org/wiki/Amniotic_sac

    Amniotic cavity in human embryo 1.3 mm. long. The amniotic cavity is the closed sac between the embryo and the amnion, containing the amniotic fluid. The amniotic cavity is formed by the fusion of the parts of the amniotic fold, which first makes its appearance at the cephalic extremity and subsequently at the caudal end and sides of the embryo ...

  6. Twin - Wikipedia

    en.wikipedia.org/wiki/Twin

    The human twin birth rate in the United States rose 76% from 1980 through 2009, from 9.4 to 16.7 twin sets (18.8 to 33.3 twins) per 1,000 births. [5] The Yoruba people have the highest rate of twinning in the world, at 45–50 twin sets (90–100 twins) per 1,000 live births, [6] [7] [8] possibly because of high consumption of a specific type of yam containing a natural phytoestrogen which may ...

  7. What is uterus didelphys? Why some women have two ... - AOL

    www.aol.com/lifestyle/why-people-born-2-uteruses...

    In 2019, a woman living in Bangladesh with a double uterus gave birth to three babies — first, a baby from one uterus, and then, 26 days later, twins from her second uterus.

  8. Gestational sac - Wikipedia

    en.wikipedia.org/wiki/Gestational_sac

    The mean sac diameter [3] can effectively estimate the gestational age [4] between 5 and 6 weeks, with an accuracy of about +/- 5 days. [ 5 ] The yolk sac and embryo should be readily identifiable when the gestational sac reaches a certain size — a yolk sac should be seen when the gestational sac is 20mm and a fetal pole should be seen when ...

  9. Alabama woman with double uterus gives birth to rare twin girls

    www.aol.com/news/alabama-woman-double-uterus...

    An Alabama woman with a rare congenital anomaly that results in her having two uteri gave birth to healthy twin girls earlier this week. Kelsey Hatcher and husband Caleb welcomed Roxi Layla on ...