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Purpose <p>To report the first documented case of an enlarged hypoglossal branch of the ascending pharyngeal artery (APA) traversing the hypoglossal canal and continuing to the anterior inferior cerebellar artery (AICA).</p> Methods <p>Magnetic resonance imaging (MRI), including extracranial and intracranial magnetic resonance angiography (MRA), was performed for the evaluation of suspected cerebrovascular disease in a 58-year-old man presenting with acute-onset right hemianopsia. The examinations were performed using a 3-Tesla scanner, and intracranial MRA was performed using a standard 3-dimensional time-of-flight technique.</p> Results <p>MRA demonstrated an enlarged right APA entering the hypoglossal canal and continuing to the AICA. The right vertebral artery was hypoplastic and continued to the posterior inferior cerebellar artery.</p> Conclusion <p>We report the first documented case of continuity between the APA traversing the hypoglossal canal and the AICA. A meticulous review of MRA source images and the creation of maximum-intensity-projection and partial volume-rendering images are useful for the reliable recognition of this variation.</p>

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Right anterior inferior cerebellar artery supplied by the hypoglossal branch of the ascending pharyngeal artery diagnosed by magnetic resonance angiography

  • 期刊论文

  • 发表日期：

    2026年1月29日

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  • Hiroki Sato,
  • Akira Uchino,
  • Satoshi Kobayashi,
  • Yasutaka Baba

摘要

Purpose

To report the first documented case of an enlarged hypoglossal branch of the ascending pharyngeal artery (APA) traversing the hypoglossal canal and continuing to the anterior inferior cerebellar artery (AICA).

Methods

Magnetic resonance imaging (MRI), including extracranial and intracranial magnetic resonance angiography (MRA), was performed for the evaluation of suspected cerebrovascular disease in a 58-year-old man presenting with acute-onset right hemianopsia. The examinations were performed using a 3-Tesla scanner, and intracranial MRA was performed using a standard 3-dimensional time-of-flight technique.

Results

MRA demonstrated an enlarged right APA entering the hypoglossal canal and continuing to the AICA. The right vertebral artery was hypoplastic and continued to the posterior inferior cerebellar artery.

Conclusion

We report the first documented case of continuity between the APA traversing the hypoglossal canal and the AICA. A meticulous review of MRA source images and the creation of maximum-intensity-projection and partial volume-rendering images are useful for the reliable recognition of this variation.