Recent survey data from Japan indicates a higher prevalence and older peak onset age for moyamoya disease than previously recognized, along with a notable proportion of asymptomatic cases.
The epidemiological features of moyamoya disease determined by this survey varied considerably from previous data. The detection rate and prevalence of the disease were higher than those reported previously. The highest peak of onset age was older than those reported previously. In addition, it was revealed that asymptomatic moyamoya patients are not always rare in Japan.
Baba et al. (Thu,) studied this question.