めまい発作の反復するPersistent Primitive Hypoglossal Arteryの1症例

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A case of persistent primitive hypoglossal artery (p. h. a.) is presented and the literature on the subject was briefly reviewed as to its clinical symptoms and mechanism.A 38-year-old woman suffered from dizziness, headache and left hemihypesthesia including her face. A four vessel study revealed that an anomalous vessel started in the left internal carotid artery at the level of C1-C2, entered the posterior fossa through the condylar portion and joined the basilar artery and that both vertebral arteries were hypoplastic. Neither aneurysm nor other vascular malformation could be found.About a hundred case-reports appear in the literature until now. But there are few reports about patients who complained dizziness.The mechanism of the dizziness in this anomaly is as follows: Since p. h. a. is often accompanied by hypoplastic vertebral arteries and post communicating arteries, the blood flow to the brainstem depends only upon this anomalous artery. For this, once the mechanism of decreasing the blood flow happens, it leads the patient to feel dizziness and other symptoms.
耳鼻咽喉科臨床学会の論文