Understanding of Disease
- Early Case Reports: In 1957 Takeuchi and Shimizu (57) reported a case of ‘hypoplasia of the bilateral internal carotid arteries’ in a Japanese journal and Kudo et al. (33), published a case of ‘occlusion of internal carotid artery’ in the same year.
- The Term ‘Moyamoya’ Disease: The term ‘moyamoya’ is a Japanese word used for description of puffs of smoke. The term ‘moyamoya’ was introduced for the angiographic appearance of fine tangles of basal moyamoya vessels as visualized on arteriogram. Suzuki and Takaku (53) firstly used the term in an article in 1969 and now ‘Moyamoya Disease’ became the most commonly used name of this entity worldwide.
- Imaging of CNS: For the definite diagnosis of Moyamoya Disease, cerebral angiography is mandatory. However, advancement of neuroimaging such as MRI, SPECT, and PET allows diagnosis (without angiography) and functional evaluation including assessment of the state of cerebral hemodynamics.
- Revascularization: Treatment of Moyamoya is predicated on surgical revascularization, typically using branches of the external carotid artery to bypass the reduced flow at the stenotic areas of the internal carotids. Bypass techniques can be indirect (relying on ingrowth of new vessels over time) or direct (involving surgical anastomosis between a donor and recipient vessel).
- Surgical Technique of Indirect Revascularization: In 1977 Karasawa et al. first described an indirect revascularization method, EMS (23). Thereafter, other techniques of indirect revascularization such as EDAS and various modifications or combinations of direct and indirect revascularization methods were suggested (43).
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