Extra sack on 18 week sonogram

MamaWorld

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I went for my 18 week sonogram yesterday. They found an extra, empty sac. The sono tech and the doctor have no clue what it is. They say they've never seen anything like it. They're supposed to be talking to a prenatal specialist and getting back to me but I'm going crazy waiting for a call back. Has anyone ever had this happen?
 
Not personally but could it be 'disappearing twin syndrome?' Where the pregnancy was/could have been a twin pregnancy but the twin didn't make it? Have you had an uss prior to this one? Was the sac present on the earlier uss? X
 
I had a transvaginal us at 7 weeks and they didn't say anything about it then. I even asked if there were two because I've always wanted twins.
 
Little bit of an update. I got a call from my Obgyn. I'm have to go see a prenatal specialist for additional sonograms. Now I'm just waiting for them to call me back with an appointment day/time. I hate the waiting game :(
 
Maybe a vanishing twin. It's possible the sack was too small to really see at 7 weeks, especially if it only ever developed into a sack at 18 weeks. If it is I was told VTS doesn't usually harm the healthy twin. GL
 
Maybe a vanishing twin. It's possible the sack was too small to really see at 7 weeks, especially if it only ever developed into a sack at 18 weeks. If it is I was told VTS doesn't usually harm the healthy twin. GL

I keep reading and hearing about the vanishing twin syndrome. I hope that's not it. :-(
 
No I've never heard of this but please let us know what your ob says. Very interesting that they never saw it in another sonogram until now.
 
I went to the perinatal specialist yesterday. They aren't sure exactly what it is. It's either a cyst or a pin hole in my uterus where fluid is leaking out. I guess either way it puts me at risk for pre term labor so they want to keep an eye on it and make sure it's not getting bigger. I have to get a sonogram done once a week until I'm 24 weeks, then twice a week after that.
 
Hope it's not anything too serious Hun. X
 
Not sure if anyone is still following but I'll keep updating just in case. I went to the Obgyn today and they're still not sure exactly what this extra sack is but it's slightly larger than when they first found it (at 18 weeks). There's a thin wall between my uterus and this sack and they're worried that the wall is going to give out and cause major problems. I'll still be going once a week for a sonogram until I'm 24 weeks. Then I'll be going twice a week for sono and stress test. They also mentioned starting a steriod treatment when I'm 24 weeks to strengthen his lungs in case I have him early. I'm still confused by this and even the perinatal specialist is. Trying to stay strong and not stress but it's very hard. My next appointment is May 8th with the perinatal specialist. I'll post an update after that appointment. Thanks to anyone who is still following my posts.
 
:hugs: Best of luck that it just hangs out there and does no harm. I'm continuing to follow.
 

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