Table 1.

Diagnostic chart of moyamoya disease and current healthcare benefit by the Japanese government in 2014

	Affected hemisphere (steno-occlusive side)	Association of underlying disease	Healthcare benefit by the government (Japan)
Definitive moyamoya disease	Bilateral	None	Yes
Quasi-moyamoya disease	Bilateral or unilateral	Yes**	None
Probable moyamoya disease*	Unilateral	None	None

^*:moyamoya disease with unilateral involvement

^**:atherosclerosis, autoimmune diseases, meningitis, von Recklinghausen’s disease, brain tumors, Down syndrome, traumatic brain injury, cranial irradiation, hyperthyroidism, etc.