Hi El, welcome to our moyamoya family.  We are all wondering that same question.  I have two sons ages 7 and 6.  I had my boys before I found out about my moyamoya.  My first son was premature and is now behind in school.  I don't know if it has anything to do with the moyamoya or not.  I joined the  genetic testing group from the University of Texas but we haven't heard anything back.  It  took a long time just to send my samples there.  I know that this doesn't give you any answers.  Sorry.  Just know that we are all here for you.
                              Best of luck,  Newt(Natalie)

I had surgeries with Dr. Gary Steinberg on Oct 31 and Nov 7 this year and am worried about the hereditary link as well. My son, David (who is 36), had a few dizzy spells; because of moyamoya his doctor sent him in for a MRI/MRA last Wednesday. He got the results today - the good news is he DOES NOT have moyamoya, but he does have a developmental venous anomaly (a venous angioma). His doctor has made an appointment with Dr. David Newell here in Seattle at the Seattle Neuroscience Institute at Swedish Medical Center on Jan 7th (Dr. Newell is a neurosurgeon who has performed about 200 by-pass surgeries for moyamoya). I also faxed his MRI/MRA report to Dr. Steinberg's office this morning. Now we wait - seems I've been here before. From what we've read on the internet, I don't think we have anything to worry about, but I do wonder how many of us with moyamoya disease have family members who have either moyamoya or some other brain abnormality. My maternal grandmother was diagnosed with Altzheimer's, before the time of MRI/MRA diagnostics, many of my family believe she may have had many small, silent strokes, who knows maybe she had moyamoya. I know that I have at least two normal but rare developmental variants in other veins and arteries in my body - is this a common theme among those with moyamoya disease?
Kim

Hey Kim,
     I have moyamoya vessels in my brain but I also have abnormal vessels in and around my kidneys.  It is called Fibro-muscular-dysplasia.  It isn't nearly as bad as the MM.  Sometimes I just go to the bathroom more often.
                              Newt(Natalie)