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The middle cranial fossa approach: an anatomical study
1Department of Otolaryngology and Head and Neck Surgery, Victoria Infirmary, Glasgow, UK.
Surgical and Radiologic Anatomy : SRA
|March 26, 2003
Summary
Hearing preservation surgery for vestibular schwannomas is enhanced by the middle cranial fossa approach. Anatomical study reveals key landmarks, like the facial nerve and semicircular canal angle, crucial for safe dissection and improved outcomes.
Area of Science:
- Neurosurgery
- Otolaryngology
- Anatomy
Background:
- Vestibular schwannomas are increasingly diagnosed early, enabling hearing preservation surgery.
- The middle cranial fossa approach is a key technique for resecting these tumors while preserving hearing.
Purpose of the Study:
- To conduct an anatomical study of the middle cranial fossa approach to the internal auditory meatus.
- To critically analyze subapproaches for internal acoustic meatus dissection.
Main Methods:
- Anatomical dissection of 20 fresh temporal bones simulating the middle cranial fossa approach.
- Measurement of critical angles and distances relevant to surgical landmarks.
Main Results:
- The angle between the facial nerve and semicircular canal is typically less than 60 degrees, with significant individual variability.
- Geniculate fossa roof dehiscence was frequently observed.
- The average distance from the craniotomy's inner table to the superior semicircular canal was 22 mm.
Conclusions:
- Safe dissection during middle cranial fossa surgery is aided by recognizing the acute angle between the facial nerve and superior semicircular canal.
- Utilizing the relationship between the inner table and anatomical landmarks facilitates dissection in this challenging surgical area.