Monoamniotic Twins

Coulton, Donald; Hertig, Arthur T.; Long, W. Newton

doi:10.1016/s0002-9378(16)39480-7

Cited by 36 publications

(11 citation statements)

References 6 publications

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“…MoMo twins presumably arise at approximately days 8-10 of fertilization age and are next to last in the spectrum of the MZ twinning events (Coulton et al 1947 ) . This type of placenta is also nearly always found with conjoined twins, only one exception having been published (Weston et al 1990 ) .…”

Section: Monoamnionic Monochorionic Twin Placentamentioning

confidence: 99%

Multiple Pregnancies

Benirschke¹,

Burton²,

Baergen³

2012

Pathology of the Human Placenta

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Section: Monoamnionic Monochorionic Twin Placentamentioning

confidence: 99%

Multiple Pregnancies

Benirschke¹,

Burton²,

Baergen³

2012

Pathology of the Human Placenta

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“…M onoam niotic twinning is comparatively rare an d occurs when a zygote's germinal disc splits during development of the am nion between the 7th and 13th day after fertilization (Coulton et al, 1947). It necessarily follows that such twins must be uniovular.…”

Section: Discussionmentioning

confidence: 99%

Failure to diagnose monoamniotic twin pregnancy by ultrasound but with fortunate outcome

CHAPMAN

1999

Journal of Obstetrics and Gynaecology

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A 31-year-old para one gravida 3 becam e pregnant for the fourth time and a twin pregnancy was con® rmed at the 10th week. The detailed 20 week scan noted that both fetuses were growing appropriately, identi® ed a separating m em brane an d recorded a single right antero-lateral placental mass. Subsequent clinical and ultras ound exam inatio ns c on® r m ed nor m al fetal growth. Cardiotography from the 39th week onwards gave normal reactive tracings. Induction at term was planned but the woman refused.L ab o ur be gan at 41 we eks w ith th e ® rs t tw in presenting by the vertex. The ® rst stage lasted 11 hours and 55 minutes and the m embranes were left intact on the insistence of the wom an. The second stage lasted only 5 m inutes and a female infant with Apgars of 9 an d 10 and w eighing 3085 gram s was de live red. Following this, two cords descended twisted together, followed by a foot. Immediate breech extraction was, the refore, unde rtaken and a sec ond fe m ale tw in, weighing 3615 gram s and with satisfactory Apgars of 7 and 9 was delivered. Ten minutes only had elapsed between delivery of the ® rst and second twin.T he plac enta was delivered 4 m inutes late r. It measured 20× 18× 3 cm . Inserted marginally were two three-vessel cords. There was no evidence of um bilical vasculitis neither was there any signi® cant number of nucleated red cells in either fetal circulation. There was considerable cord entanglement with a true knot in the cord of twin one (Figure 1). At the base of the insertion of the cords were clear-cut anastomoses on the surface of the placenta between super® cial um bilical veins. There was no evidence of a mem branous partition between the cord insertions. It was, therefore, de® nitely a m onoam niotic twin placenta and the twins were identical.

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“…Most of the reports on Siamese twins joined by their heads relate to stillbirths or to viable infants surviving but a short time (Blumensaat, 1932;Mortimer and Kirshbaum, 1942;Gunter, 1946;Coulton, Hertig, and Long, 1947;Leinzinger and Scherrer, 1953;Haug and Leonhardt, 1955, and others). The known instances when surgical separation of cephalopagous was attempted are only few.…”

Section: Discussionmentioning

confidence: 99%

“…The twins will be enveloped by one chorion and one amnion. It is well known (Coulton et al, 1947) that monoamniotic twins are frequently stillborn as a result of compression of the severely intertwined umbilical cords which lead to obstruction of the blood circulation. The possibility of the occurrence of conjoined twins as a result of subsequent fusion of the once separate embryos seems very remote, at least in symmetrical Siamese twins.…”

Section: Discussionmentioning

confidence: 99%