Asymptomatic Moyamoya disease.

To the Editor: We read with great interest the article by Kuroda et al1 concerning asymptomatic moyamoya disease (MMD) in multicenter survey. The authors describe clinic-radiological findings in 40 patients. We also reported asymptomatic MMD adults on brain check-up (BC)–based population in Japan.2 A total of 11 402 healthy subjects (7570 men and 3832 women) offered BC between January 1997 and November 2003. Mean age (SD) of subjects was 53.2 (11.1) years, 53.2 (10.9) in men and 53.2 (11.5) in women. Probable …