The staging system for moyamoya disease first described by Suzuki and Takaku in their seminal 1969 article1 is still in use today. Formally, the staging refers to findings on conventional angiography, although there are efforts to apply similar systems to MR angiography.2
Suzuki stage appears to correlate with collateralization in children, but not in adults.3
The vast majority of patients will progress through some or all of the Suzuki stages, although progression may occur at different rates5, and appears to occur more rapidly in children than in adolescents or adults.4
The Suzuki stages are as follows:
- "narrowing of the carotid fork" *
- narrowed ICA bifurcation
- stage II
- "intensification of the moyamoya"
- further increase in moyamoya change of the ICA bifurcation and narrowed ACA and MCA
- "minimization of the moyamoya"
- moyamoya change reducing with occlusive changes in ICA and tenuous ACA and MCA
- "reduction of the moyamoya"
- further decrease in moyamoya change with occlusion of ICA, ACA and MCA
- "disappearance of the moyamoya"
- ICA essentially disappeared with supply of brain from ECA
* the description in inverted commas is that of Suzuki in the original paper.
- 1. Jiro Suzuki, Akira Takaku. Cerebrovascular "Moyamoya" Disease: Disease Showing Abnormal Net-Like Vessels in Base of Brain. Arch Neurol. 1969;20(3):288-299.
- 2. Houkin K, N Nakayama, S Kuroda, et al. Novel Magnetic Resonance Angiography Stage Grading for Moyamoya Disease. 2005;20 (5): 347–54. . doi:10.1159/000087935.
- 3. Suzuki J and N Kodama. Moyamoya disease--a review. 1983;14 (1): 104–9. . doi:10.1161/01.STR.14.1.104.
- 4. Houkin K, T Yoshimoto, S Kuroda, et al. Angiographic analysis of moyamoya disease--how does moyamoya disease progress? Neurol Med Chir (Tokyo). 1996;36 (11): 783–787; discussion 788.
- 5. Scott RM and ER Smith. Moyamoya disease and moyamoya syndrome. 2009;360 (12): 1226–1237.