Does moyamoya syndrome run in families? Do my affected childs brothers and sisters need to be checked for the presence of the syndrome?
In our own series, we have 19 patients (twelve families) where there are either siblings with the syndrome, or a parent-child syndrome. One operated patient has two children, one of whom has the moyamoya syndrome. One patient has two other siblings who have the syndrome. In general, however, a familial or genetically transmitted form of moyamoya syndrome is rare in the Western Hemisphere. There is no current method of determining before birth whether the developing fetus is likely to have the syndrome. As of March 2008, we have not recommended that siblings of affected patients be studied by MRI/A or angiography unless there are compelling reasons to do so, such as symptoms that suggest temporary loss of blood flow to the brain, such as stroke, TIAs, seizures, and so on. We have recommended that identical twins be studied, as well as siblings where there is a strong family history of stroke at an early age. Although the average age for the development of symptoms is around 7 years, no
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