Suzuki Classification

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The Suzuki classification is used to classify Moyamoya disease and was first published in 1969[^1].

Classification

Classification is based on diagnostic angiography and is divided into 6 grades:

Suzuki Grade

Angiographic characteristics

Grade I

Stenosis of the terminal Internal carotid artery.

Grade II

Beginning "Moyamoya" collateral vessels.

Grade III

Increasing "Moyamoya" collateral vessels.

Grade IV

Development of transdural collateral vessels arising from the External carotid artery.

Grade V

Augmentation of the transdural collateral vessels and reduction of the "Moyamoya" collateral vessels.

Grade VI

Complete occlusion of the internal carotid artery and complete regression of the "Moyamoya" collateral vessels.

Figure

Suzuki classification
Schematic and illustrative depiction of the 6 grades of the Suzuki classification (a–e). Figure adapted from Shang et al. (DOI: 10.1007/s10143-018-0994-5)

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