Many kinds of the collateral cerebral circulation on moyamoya disease are already discussed by many authors, such as by the ophthalmic A, external carotid A, meningeal A, choroidal A, and sagittal sinus.
In many case of the moyamoya disease, the moyamoya vessels around the circle of Willis has the role of one part of the collateral pathway of the cerebral circulation.
In this paper, the result of the clinical research work on our moyamoya series upon the collateral circulation pass through the moyamoya vessels compared with the other collateral circulations were discussed.
The result of this study is comparatively considered with clinical course as the classification for juvenile type, hemorrhagic type and adult type.
The abundance of the collateral circulation from the moyamoya vessels to the cortical vessels has intimate relation with the clinical classification.
In the juvenile type, the collateral circulation from the moyamoya vessels to the cortical vessels is observed rather well condition, with the collateral circulation of another types.
In the hemorrhagic type, the condition of the collateral circulation is quite different from the juvenile type. The collateral circulation from moyamoya vessels is poorly observed, with, at the same time, poorly collateral circulation of another types.
On the adult type, the condition of the collateral circulation observed as the midways of the above two types.
