Suzuki staging system for Moyamoya

Suzuki and Takaku first described moyamoya and its staging in 1969.

  • stage I
    • "narrowing of the carotid fork" *
    • narrowed ICA bifurcation
  • stage II
    • "initiation of the moyamoya"
    • dilated ACA, MCA and narrowed ICA bifurcation with moyamoya change
  • stage III
    • "intensification of the moyamoya"
    • further increase in moyamoya change of the ICA bifurcation and narrowed ACA and MCA
  • stage IV
    • "minimization of the moyamoya"
    • moyamoya change reducing with occlusive changes in ICA and tenuous ACA and MCA
  • stage V
    • "reduction of the moyamoya"
    • further decrease in moyamoya change with occlusion of ICA, ACA and MCA
  • stage VI
    • "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. 

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Article information

rID: 3553
Synonyms or Alternate Spellings:
  • Moya moya staging (Susuki)

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Cases and figures

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    DSA  right ICA

    Case 1 : DSA right ICA
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    ICA Stenosis
    Case 2 : ICA Stenosis
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    Collaterals from ...
    Case 2 : with collaterals
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