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Updated: Sep 18, 2025

Microvascular Decompression: Salient Surgical Principles and Technical Nuances
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Persistent trigeminal artery variant functioning as a duplicate superior cerebellar artery.

George Triantafyllou1, Panagiotis Papadopoulos-Manolarakis1,2, George Tsakotos1

  • 1Department of Anatomy, School of Medicine, Faculty of Health Sciences, National and Kapodistrian University of Athens, 75 Mikras Asias Str., Goudi, 11527, Athens, Greece.

Surgical and Radiologic Anatomy : SRA
|June 23, 2025
PubMed
Summary

A rare duplicated superior cerebellar artery (SCA), originating from the internal carotid artery (ICA) instead of the basilar artery (BA), was identified. This unique vascular anomaly highlights variations in the cerebral arterial circle and has clinical implications.

Keywords:
AnatomyCarotid-vertebrobasilar anastomosisPersistent trigeminal arteryPersistent trigeminal artery variantSuperior cerebellar arteryVariation

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Area of Science:

  • Neuroanatomy
  • Vascular Neurology
  • Radiology

Background:

  • The cerebral arterial circle exhibits considerable anatomical variation, often revealed by advanced imaging.
  • Understanding these variations is crucial for diagnosing and treating cerebrovascular diseases.

Observation:

  • A rare case of a duplicated superior cerebellar artery (SCA) was identified in a 58-year-old female via magnetic resonance angiography (MRA).
  • The duplicated SCA originated from the internal carotid artery (ICA) rather than the typical distal basilar artery (BA).

Findings:

  • The accessory SCA shared vascular territory with the primary SCA, running parallel to it.
  • This duplicated SCA configuration, arising from the ICA, is exceptionally rare and previously unreported in combination with a typical SCA.

Implications:

  • This case underscores the dynamic embryological development of the cerebral arterial circle and carotid-vertebrobasilar anastomoses.
  • Such vascular anomalies are clinically significant for neurovascular compression syndromes (e.g., trigeminal neuralgia) and neurosurgical/endovascular procedures.