ULTRASOUND Messages for October, 2003: Re: Conjoined twins with different genders

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I have probably misunderstood something here. Moroder, Souter, and Jeanty have all seen cases of sex-discordant twins with that appear to be monochorionic twins, correct? And at least one of these are "conjoined", or is more than one set of male/female twins conjoined. With 3 cases, I don't understand why we have not seen this before.

Or is it the case that we have not had the genome and sonography together long enough, and no one looked? Has this been going on all along, and we just did not recognize it?

On Sat, 18 Oct 2003 07:27:09 -0500 wolfgang.moroder@tin.it (Wolfgang Moroder, M.D.) writes: > Terry, I don't think we can talk about prevalence of "heterogender"
> monochorionic twins in literature since the case published by Vav
> Souter
> on the NEJM is the first to my knowledge. Thank you for publishing
> my
> images on the Ultrasound section as a Interactive Informal Case
> here:
>

http://www.obgyn.net/us/us.asp?page=/us/present/1003/moroder_monochorioni c >
> I'd like to remember the fact that the paired yolk sac sign (8 sign)
> is
> pathognomonic of a monochorionic pregnancy and quite common. The
> yolk
> sacs in monochorionic pregnancy are located in one space which is
> the
> extraembryonic coelom and sometimes, who knows why?, they seem to
> be
> attracted by each other... even if they are of the same sex!
> Ciao Wolfgang
>
> At Thu, 16 Oct 2003, Terry J. DuBose wrote:
> >
> >So what is the prevelence of these hetrogender twins?... in the
> literature? Terry
> >
> >ultrasound@obgyn.net writes:
> >>In a message dated 10/16/2003 4:53:18 PM Eastern Daylight Time,
> vsouter@yahoo.com writes:
> >>
> >>> We postulated a fusion event as the cause of our unusual twins.
> Rowena Spencer has is a proponent of fusion rather than
> >>> fission as the cause of amny conjoined twins.
> >>
> >>Is Rowena still working?
> >>
> >>Joe P.
> >
> >--
> >Terry J. DuBose, M.S., RDMS, FSDMS, FAIUM
> >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/dms/default.asp
> >http://www.obgyn.net/us/panel/panel.htm
> >
>
> --
> Wolfgang Moroder, MD
> Prenatal Unit
> Bolzano General Hospital Italy
>
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On Sat, 18 Oct 2003 07:27:09 -0500 wolfgang.moroder@tin.it (Wolfgang Moroder, M.D.) writes:
> Terry, I don't think we can talk about prevalence of "heterogender"
> monochorionic twins in literature since the case published by Vav
> Souter
> on the NEJM is the first to my knowledge. Thank you for publishing
> my
> images on the Ultrasound section as a Interactive Informal Case
> here:
>
>
> http://www.obgyn.net/us/us.asp?page=/us/present/1003/moroder_monochorionic
>
> I'd like to remember the fact that the paired yolk sac sign (8 sign)
> is
> pathognomonic of a monochorionic pregnancy and quite common. The
> yolk
> sacs in monochorionic pregnancy are located in one space which is
> the
> extraembryonic coelom and sometimes, who knows why?, they seem to
> be
> attracted by each other... even if they are of the same sex!
> Ciao Wolfgang
>
> At Thu, 16 Oct 2003, Terry J. DuBose wrote:
> >
> >So what is the prevelence of these hetrogender twins?... in the
> literature? Terry
> >
> >ultrasound@obgyn.net writes:
> >>In a message dated 10/16/2003 4:53:18 PM Eastern Daylight Time,
> vsouter@yahoo.com writes:
> >>
> >>> We postulated a fusion event as the cause of our unusual twins.
> Rowena Spencer has is a proponent of fusion rather than
> >>> fission as the cause of amny conjoined twins.
> >>
> >>Is Rowena still working?
> >>
> >>Joe P.
> >
> >--
> >Terry J. DuBose, M.S., RDMS, FSDMS, FAIUM
> >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/dms/default.asp
> >http://www.obgyn.net/us/panel/panel.htm
> >
>
> --
> Wolfgang Moroder, MD
> Prenatal Unit
> Bolzano General Hospital Italy
>
>

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