In general how to adults present? How do children present?
Adults tend to haemorrhage from the colaterals, whereas children tend to infarct.
What is the difference between moya moya disease and moya moya pattern (or phenomenon or syndrome)?
Moya moya syndrome (also termed the moya moya pattern or phenomenon) is due to numerous identifiable conditions that can cause arterial occlusion of the circle of Willis, with resultant collaterals, and appearances reminiscent of moya moya disease.
The supraclinoid ICA and P1 segments of the PCA are occluded with large perforator collaterals. A number of basal ganglia infarcts are noted on DWI.