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Updated: Jun 14, 2025

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A rare morphological variant: Bilateral accessory optic canal.

G Triantafyllou1, M Piagkou1, G 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.

Morphologie : Bulletin De L'Association Des Anatomistes
|January 24, 2025
PubMed
Summary
This summary is machine-generated.

Researchers discovered rare bilateral accessory optic canals, likely transmitting the ophthalmic artery. This anatomical variation highlights the importance of preoperative assessment for orbital surgeons.

Keywords:
Accessory optic canalAnatomyOptic canal duplicationOrbitVariation

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Area of Science:

  • Anatomy
  • Morphology
  • Skull Base Anatomy

Background:

  • The optic canal (OC) is crucial for transmitting the optic nerve (ON) and ophthalmic artery (OA).
  • Morphological studies of the OC typically focus on its dimensions, with limited documented variability.

Observation:

  • An unusual anatomical variant was identified during routine examination of an osteological collection.
  • Both the right and left optic canals exhibited an accessory canal located inferolaterally to the main OC.

Findings:

  • The bilateral accessory canals measured 1.88×1.96mm on the left and 2.41×2.89mm on the right.
  • The accessory canals are presumed to transmit the ophthalmic artery, representing a rare bilateral duplication of the OC.

Implications:

  • Bilateral OC duplication is a scarce anatomical variant that requires consideration in surgical planning.
  • Preoperative identification of such variations is essential for orbital surgeons to prevent intraoperative complications.