Ultrasound shows cyst on baby's kidney

Cari
I'm high risk for various reasons and so I have monthly ultrasounds.  Yesterday I had one (I'm a little over 24 weeks) and they found a cyst on my little girl's right kidney.  Only one and doc said we can only monitor and see if it goes away.  If not, then once she's born a pediatrician will need to advise us on what to do.  Just looking for some others who have had this or know of someone who has.   I'm feeling super helpless and I'm so worried. 
Here she is. she kicks/moves around like crazy.