Three to six months after the procedure, blood flow to the brain increases dramatically.
"You see these beautiful blood vessels extending down into the brain," Bain said.
Erica, now 7, had two EDAMS surgeries, one in December on the left side of her brain where the stroke occurred and the second in March on the right side, where doctors could already see that Moyamoya was damaging her blood vessels.
Wilcox said they won't know until October how the surgery has helped Erica's brain regrow blood vessels. But for now, he said her strength is returning and she has no more numbness or tingling in her arms. He said although Moyamoya and pediatric strokes are rare, other parents should know that they can happen to even healthy children.
"Don't ignore the small things. If it's something out of the ordinary, get it checked out," Wilcox said.
Bain said parents who notice classic stroke symptoms appearing in their children, such as loss of motor function, dizziness and double vision, should get them to a doctor immediately.