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Related Experiment Videos

What is the arcuate eminence?

A Faure1, H Masse, M Gayet-Delacroix

  • 1Service de Neurotraumatologie, Hôtel-Dieu, CHU de Nantes, Place Alexis Ricordeau, 44093, Nantes Cedex 1, France.

Surgical and Radiologic Anatomy : SRA
|June 13, 2003
PubMed
Summary

The arcuate eminence (AE) is an unreliable landmark for the superior semicircular canal (SSCC) during surgery. This study found the AE is only a good guide in 37% of cases, making it unsuitable for acoustic neuroma surgery.

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Area of Science:

  • Neurosurgery
  • Anatomy
  • Radiology

Background:

  • The suprapetrous approach to the internal acoustic meatus is crucial for acoustic neuroma extirpation.
  • Accurate anatomical landmarks are vital for surgical success and patient safety.

Purpose of the Study:

  • To evaluate the arcuate eminence (AE) as a reliable landmark for the superior semicircular canal (SSCC).
  • To assess the AE's utility in the suprapetrous approach for acoustic neuroma surgery.

Main Methods:

  • Analysis of 100 homogeneous CT scans of the petrous temporal bone.
  • Direct measurements on 1 mm thick coronal sections.
  • Correlation with MRI findings for temporal sulcus imprints.

Main Results:

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  • The AE was absent in 15% of cases.
  • AE correctly identified the SSCC relief in only 37% of cases.
  • AE-SSCC correspondence varied, with significant bone thickness between AE and cortex in some cases (0.5-5 mm).
  • AE was not a good landmark in 48% of cases.
  • AE does not routinely correlate with temporal sulcus imprints on MRI.

Conclusions:

  • The arcuate eminence is an unreliable surgical landmark for the superior semicircular canal.
  • The AE's variability and inconsistent relationship with the SSCC preclude its routine use in suprapetrous approaches.
  • Surgical planning for acoustic neuroma extirpation should not solely rely on the arcuate eminence.