永存舌下动脉（PPHA）是第二常见的颈动脉-椎基底动脉异常吻合，发病率约为0.02%-1%，其中约65%发生在左侧。

Persistent hypoglossal artery (PPHA) is the second most common carotid-vertebrobasilar anastomosis, with an estimated prevalence of 0.02%–0.1%, with 65% of them being left-sided.

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永存舌下动脉（PPHA）是第二常见的颈动脉-椎基底动脉异常吻合，发病率约为0.02%-1%，其中约65%发生在左侧。

Persistent hypoglossal artery (PPHA) is the second most common carotid-vertebrobasilar anastomosis, with an estimated prevalence of 0.02%–0.1%, with 65% of them being left-sided.

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