Ultrasound shows 2 yolks 1 sac dividing?

lightningrod · December 2013

My wife went for her first ultrasound today and twins are confirmed but there is a possibility that there is 2 yolks sharing the same sac? All I see is a faint line at the bottom of the sac which is the area the doctor is a bit concerned since the sac might divide? I think it's too early to know what exactly is going on. I know twins are risky and the good monitoring helps make it a success. I know ultrasounds show a lot of discrepancies which the doctor stated such as in this case it can be a shadow since it's too early to tell. So hopefully next Friday we have a clearer image of what is going on and if it is splitting we should know which twin is sharing what like placenta, nutrients etc. So now its a nervous time period until next Friday. Has anyone witness a similar case? Here is the photo the middle black sac lower right hand side is what dr. was cocerned about I see a faint line but thats it.

lightningrod · December 2013

Also to note this ultrasound was done 2 weeks after pregnancy test confirmed so I read it's to early to tell until 8 weeks for this diagnosis.

PurpleIris30 · December 2013

I'm confused by your description. Are you talking about the gestational sac (dark blob on the screen)? That doesn't split. For monochorionic twins (one placenta), you have one sac and would see two beating hearts inside. Very early in pregnancy you can't see if there is a dividing membrane or not because it's too thin (this indicates monoamniotic or diamniotic - one or two amniotic sacs).

xnbride · December 2013

Do you havea picture? I am also a bit confused by the description. So was there two yolk sacs in the same chorionic sac? If so then the babes are probably mo/di or mo/mo but most likely mo/di and the membrane can't be visualized yet because she is still early. The best time to determine the type of twin pregnancy is around 9/10 weeks.

I am expecting mo/di twins. At our 9 week ultrasound you could see the very thin membrane seperating the babies.

Congratulations!

lightningrod · December 2013

picture added.

Mrs. Alice · December 2013

I'm no expert, but I don't think sacs can divide at this point in pregnancy. I believe that is all determined and done at the time of and right after implantation. I'm still not quite understanding what you are showing on the u/s. It looks like only one yolk in one gestational sac here. If there were two yolks in one gestational sac you likely have mono/di twins. It's still very early so hopefully you'll be able to get a clearer picture in the next few weeks.

Rynleigh · December 2013

ok wait...

do you mean like this:

Rynleigh · December 2013

or like this:

Rynleigh · December 2013

or even this...

Rynleigh · December 2013

Need input lmao

LegalLadyBug · December 2013

I'm completely lost with that u/s as I only see one sac and one yolk lol. Fingers crossed for you and your wife that all is well and you have healthy babies.

lightningrod · December 2013

I'm just as confused as you guys. This Friday I hope to get a better reading from the dr. All I know is the dr. said there is 2 yolks in one sac. I will have to mark up the image to show you what was explained by the split to my wife. The split was shown in the black sac. The 3rd description is wrong. I will mark the point of split. I wish I knew someone else that can read these they should make them in color lol

24karat · December 2013

lightningrod said:
I'm just as confused as you guys. This Friday I hope to get a better reading from the dr. All I know is the dr. said there is 2 yolks in one sac. I will have to mark up the image to show you what was explained by the split to my wife. The split was shown in the black sac. The 3rd description is wrong. I will mark the point of split. I wish I knew someone else that can read these they should make them in color lol

OK so I think most of us are confused by your terminology and u/s picture. If there are two yolk sacs in the gestational sac, you have identical mo-mo or mo-di twins. They always share a placenta. With mo-di the dividing membrane between the babies is there early on, but often isn't clearly seen till later. Their gestational sac doesn't split later on. IMO it sounds like you guys may have misunderstood what the doctor was explaining.

lightningrod · December 2013

My wife went to the dr solo so I wasn't there but this is how it was explained to her. I will be with her this Friday to get a better understanding. The area of concern is where he stated a faint line indicates splitting and that its too early to tell but if it splits it depends what the tins would share.

Momof8inSC · December 2013

I'm still only seeing one yolk sac?

Rynleigh · December 2013

I see where it is a slightly different tone there... was this a scan done by an ultraound tech, or just done with a roll cart by her OB?

I did some contrast/brightness adjustment so others can see the "split" (or shadow) you're talking about.

Rynleigh · December 2013

That's really not anything that any of us could give you a good conclusion about... it could be anything from the person using the ultrasound reading the image incorrectly due to shadows, to a smaller sac with a hidden or failing embryo, to a growth... it could be any number of things.

lightningrod · December 2013

Thats what the dr said that its very possible it can be a shadow or anything but that it was an area for concern. Being first time parents and this IVF round actually working makes my wife vnervous when she heard the word concern. I also see 1 yolk not sure where he saw the second yolk he did saw there are twins. This Friday I will question him more to see what we are looking at. I know this is the first u/s after the pregnancy blood test so its all new to us. Thanks

24karat · January 2014

lightningrod said:
My wife went to the dr solo so I wasn't there but this is how it was explained to her. I will be with her this Friday to get a better understanding. The area of concern is where he stated a faint line indicates splitting and that its too early to tell but if it splits it depends what the tins would share.

So it sounds like (and I could be wrong) your OB was trying to explain the difference between mo-di and mo-mo. The picture you posted appears to show only one yolk sac so if twins were already confirmed, it was probably from a different angle. The splitting is in the gestation sac. Mo-mo twins share the gestation sac, placenta, and nothing separates them. Mo-di only share the placenta and have a faint membrane (line) separating them. One area of concern is that with mo-mo (which are the least common zygosity) there's an increased chance of cord entanglement. Both types are watched closely to make sure the placenta is shared evenly. Seeing two yolk sacs early on often indicates mo-di, and it is very common for a dividing membrane to not be clearly seen till later on. My twins were classified "suspected mo-di" until our 3rd u/s at 12 weeks since we couldn't see the membrane till then.

This is all just a guess at what your OB was explaining based off the info here. It's hard to hear things like "reason to be concerned", especially when there are a lot of unknowns and the news is as crazy unexpected as twins. Easier said than done, but try not to worry too much. There are lots of scary things that could happen...it doesn't mean they will. You and your wife are expecting now, that happiness is what matters for this moment.

lightningrod · January 2014

It has been confirmed we are having a singleton. Healthy heartbeat everything looking good 7 weeks 5 days pregnant. Thanks everyone

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