Anterior ethmoidal notch

Dr Henry Knipe et al.

The anterior ethmoidal notch contains the anterior ethmoidal artery and has significant rates of anatomic variation that put the artery during function endoscopic sinus surgery (FESS).

The anterior ethmoidal notch lies in the medial wall of the superomedial orbit, adjacent to the anterior ethmoid air cells

  • the notch can be identified bilaterally in 95-100% of patients on coronal reformats, and when not seen bilaterally is present unilaterally 1

During FESS the anterior ethmoidal artery is considered "protected" if the notch is adjacent to the fovea ethmoidalis or lateral lamella. The anterior ethmoidal artery is at increased risk of injury during FESS if there are pneumatized supraorbital anterior ethmoid air cells (occurs in ~30% of patients) 1.

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Article information

rID: 71451
System: Head & Neck
Section: Anatomy
Synonyms or Alternate Spellings:
  • Anterior ethmoidal artery canal
  • Anterior ethmoidal canal
  • Anterior ethmoidal foramen

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Cases and figures

  • Figure 1: "protected" red arrow; "at risk" yellow arrow
    Drag here to reorder.
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