It's a pocket of fluid in the baby's brain. I was given an information sheet that says this can occur in 5% of healthy babies and resolves itself usually by 28 weeks gestation. By itself, it isn't really a cause for much concern. If other "markers" are found it could indicate a chromosomal disorder (down syndrome or trisomy 18). Since they didn't find other problems (heart, head, kidneys, bladder, hands, feet, etc. all look good). Trisomy 18 is the one that really scares me because it is as the ultrasound tech put it "incompatible with life". I know that there are so many reasons that I shouldn't be worried about it, but when there is even that 1% chance (that is what google told me anyway)... I'll probably be a little worried about it my whole pregnancy. Seeing as how the QUAD screen won't tell me a yes or no, but only what my odds are... OY. I just hope the cyst is gone when we get another ultrasound so I don't worry so much.
It doesn't help that the other DDC I'm in on another site, just yesterday one of the girls posted that her second level 2 ultrasound strongly indicated Trisomy 18 and they decided to terminate the pregnancy so baby wouldn't have to suffer. So it was already at the forefront of my mind.
I worry too much. It's good to have a place where I can vent and not be told how silly I am working myself up this much. Outwardly I'm definitely looking on the bright side. I don't want anyone around me to think the worst, because it's 99% likely that this means NOTHING.