What kind of bone cyst is found almost exclusively in children?

Had one when I was about 7 years old - it was on an eyebrow. It was annoying until removed. Not at all frightening, perhaps because my mom stayed calm.

Player SQinfoNUTS, Very interesting. Hadn't heard of it

My son had one in his femur. we were lucky to have caught it because it was so large. he had to be operated on to remove it and his femur filled to prevent a fracture. It was the pain he was suffering that brought it to our attention.