Hi

Cathy B. and welcome to the Moyamoya family!
Your sister's story is all too familiar to many of us. My brother went misdiagnosed for 4 years, had two strokes, a dissected right upper internal carotid artery and the list keeps going. We found this site, contacted Stanford and the rest is history.
My brother was operated on (both sides) at Stanford by Dr. Steinberg in May of 2005. Today, my brother walks, talks, and has no paralysis. One would be hard pressed to know what he had gone through and the condition he was in when he arrived at Stanford. Dr. Steinberg is known as the King of neurology when it comes to Moyamoya. You are in the right place. The Stanford Moyamoya team will take care of your sister from the testing to the surgery to the aftercare and follow-up. They are truly amazing and I am in awe of their abilities as my brother's outcome is miraculous to say the least.
Please know we are here to support you and your sister through this journey so please ask any questions.
You and your sister are in my thoughts and prayers.
Please keep us posted on your sister's progress.
Hugs,
Lore