Equilibrium Research
Online ISSN : 1882-577X
Print ISSN : 0385-5716
ISSN-L : 0385-5716
大後頭孔圧迫による椎骨脳底動脈循環不全症
中山 明峰呉 孟達稲福 繁瀧本 勲
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1990 年 49 巻 4 号 p. 424-432

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Five patients with vertigo were examined radiologically and neurotologically.
Generally a posterior inferior cerebellar artery (PI-CA) branching from the vertebral artery (VA) below the foramen magnum is seldom seen in normal persons. But if a PICA or bypass branches from the VA below the foramen magnum, vertebro-basilar insufficiency may occur due to pressure on the bloodstream from the edge of the foramen magnum, especially during tests in the hanging head position.
The diagnosis of vertebro-basilar insufficiency induced by pressure by the edge of foramen magnum was made by vertebral angiography in five cases.
Electronystagmography results also presented.

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