Cyst in the umbilical cord

When I had my 20 week scan last week, they informed me that I had a cyst in the cord. Baby is healthy and growing, the doctor said it's nothing to cause concern.. but I've just been thinking about it these past couple days and just wondering if anyone has heard of this or experienced it. If so, some reassurance would be nice :( I feel her moving all the time so that helps me daily but just hoping it's nothing serious in the long run since that is the main life supply.