WOMENS-HEALTH Messages for February, 2002: Re: [Birth Control] Anembryonic sac and a normal sac in twins pregnancy

Re: [Birth Control] Anembryonic sac and a normal sac in twins pregnancy

From: R. Daniel Braun, MD (anonymous@obgyn.net)
Thu, 14 Feb 2002 05:32:49 -0600 (CST)

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In reply to: anonymous@obgyn.net: "[Birth Control] Anembryonic sac and a normal sac in twins pregnancy"

At Thu, 14 Feb 2002, anonymous@obgyn.net wrote: >
>Have twin pregnancy of around 7 weeks. ultrasound shows a normal sac
>and an anembryonic sac with no visible developments.
>what happens in these cases? what is the risk involved? what happens to
>the second sac?

Without an embryo in the second sac, it is dificult to say that it is a twin pregnancy. A collection of fluid in the uterus outside of the one sac can look just like a second sac. In the vast majority of cases such as you describe this is the case. The fluid eventually gets resorbed and no problem exists. This is what went on when US first becam available and we had thousands of cases of "Disappearing" Twin. There never really was a twin. If it were a situation as you describe, the second sac would also resorb and no problem.

--
R.Daniel Braun, MD  FACOG   FOG
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