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Re: Two Yolk Sacs, one embryo From: Wolfgang Moroder, MD (wolfgang.moroder@tin.it) Fri Jan 31 13:58:27 2003 Messages sorted by: [ date ][ thread ][ subject ][ author ] Previous message: Albana: "Re: Two Yolk Sacs, one embryo" In reply to: Albana: "Re: Two Yolk Sacs, one embryo" I understand that two conceptions in one cycle would be a dizygotic pregnancy meaning that two ova are fetilized by two sperms giving origin to fraternal twins. The case we are discussing seems to be incontrovertibly a monozygotic pregnancy meaning that somehow one egg fertilized by one sperm has split between day 4 and day 8 after conception giving origin to a monochorionic diamniotic pregnancy. If the splitting would have happened before (day 1 to day 3) there would have been a dichorionic, diamniotic twin pregnancy and if the splitting of the zigote happened after day 8 there would have been a rare (only 1% of all twins) monoamniotic pregnancy. A single extracoelomic space with paired (not divided by any membran) yolk sacs is proof of a monozygotic pregnancy. Ciao Wolfgang At Fri, 31 Jan 2003, Albana wrote: > >At Thu, 30 Jan 2003, Terry J. DuBose wrote: >> >>We have revised Dr. Libardi's case of early twins... he has provided follow-up today. We have removed the "double bleb" information, which was clearly not applicable in this case. >>>http://www.obgyn.net/us/us.asp?page=/us/present/0301/libardi_oneembryo >> >>Using Dr. Libardi's measurements in BASIC BABY software to estimate ages, I got the following: >>Larger embryo: >>CRL = 8.7 mm = 6.9 weeks >>EHR = 139 b/m = 6.8 weeks >>Smaller embryo: >>CRL = 7.7 mm = 6.7 weeks >>EHR = 129 b/m = 6.4 weeks >> >>Based upon the CRL age of 5w5d on Jan. 21, 2003, an age of about 6.9 weeks would be expected today. The report of one irregular sac is worrisome, but based on the measurements, these look very much like normal, yet slightly discordant twins. >> >>The 12 week follow-up will be anxiously awaited. >> >>Thanks for a great case from which all of us can learn. >>Peace, Terry J DuBose >> >>Susan.Dale@obgyn.net writes: >>> Case has been updated with his comments and one new image. Please let me know if this is what we want:[ http://www.obgyn.net/us/us.asp?page=/us/present/0301/libardi_oneembryo ]http://www.obgyn.net/us/us.asp?page=/us/present/0301/libardi_oneembryo >>> >>>Thanks, Susan >>> >>Peace, Terry J. DuBose, M.S., RDMS >>Assistant Professor & Director, Diagnostic Medical Sonography Program >>University of Arkansas for Medical Sciences, CHRP >>4301 West Markham St. Mail Slot #563 >>Little Rock, Arkansas, 72205 USA >>501-686-6510 >>DuBoseTerryJ@UAMS.edu >>http://www.io.com/~dubose/ >>http://www.uams.edu/CHRP/dmshome.htm >>http://www.obgyn.net/us/panel/panel.htm > >-- >Is there any posibility to be two conceptions during one cycle? >thanks a lot. >Albana Loshi > -- Wolfgang Moroder, MD Prenatal Unit Bolzano General Hospital Italy Previous message: Albana: "Re: Two Yolk Sacs, one embryo" In reply to: Albana: "Re: Two Yolk Sacs, one embryo"

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