Had the 20 week u/s last week. Everything looked OK, except one minor thing. The baby has bilateral pyelectasis. Basically, both kidneys are full of fluid (dialated).
The doc said it is very common, 1-2 in 100 pregnancies, and usually goes away on its own. I have to have another scan at 28 weeks to check the progress.
She told me what could cause it, what could happen if it did not go away on it's own.
Of course I googled it, got lots of info. Some scary, some not so much. I am not gonna stress it.