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Petrous anatomy for middle fossa approach
Levent Sennaroglu1, William H Slattery
1House Ear Clinic and House Ear Institute, Los Angeles, California 90057, USA.
The Laryngoscope
|February 5, 2003
Summary
This study defines anatomical landmarks for the middle fossa approach to the petrous apex and internal auditory canal (IAC). Two safe zones are identified to prevent damage to critical structures during surgery.
Area of Science:
- Neurosurgery
- Anatomy
- Radiology
Background:
- The middle fossa approach is crucial for accessing lesions in the petrous apex and internal auditory canal (IAC).
- Precise anatomical knowledge is essential for safe surgical navigation in this complex region.
Purpose of the Study:
- To detail the anatomical relationships and landmarks necessary for a safe middle fossa approach.
- To define specific safe zones for surgical access to the petrous apex and IAC.
Main Methods:
- A temporal bone anatomical study involving high-resolution computed tomography (HRCT) and wet bench dissection.
- Measurement of 39 distances and angular measurements between vital structures from radiological images and dissected specimens.
Main Results:
- Detailed measurements from the superior surface of the temporal bone, sigmoid sinus, inner table, anterior and posterior petrous apex, and IAC.
- Identification of two distinct safe zones (Zone I and Zone II) relative to the IAC.
Conclusions:
- Thorough understanding of petrous apex anatomy is vital for the safe execution of the middle fossa approach.
- The defined safe zones aim to minimize the risk of damaging the cochlea and superior semicircular canal.