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J Neurol Surg B Skull Base 2017; 78(04): 353-358
DOI: 10.1055/s-0037-1601886
Original Article
Georg Thieme Verlag KG Stuttgart · New York

A Method of Locating the Dehiscence during Middle Fossa Approach for Superior Semicircular Canal Dehiscence Surgery

Joel S. Beckett
1   Department of Neurosurgery, University of California, Los Angeles, Los Angeles, California, United States
,
Lawrance K. Chung
1   Department of Neurosurgery, University of California, Los Angeles, Los Angeles, California, United States
,
Carlito Lagman
1   Department of Neurosurgery, University of California, Los Angeles, Los Angeles, California, United States
,
Brittany L. Voth
1   Department of Neurosurgery, University of California, Los Angeles, Los Angeles, California, United States
,
Cheng Hao Jacky Chen
1   Department of Neurosurgery, University of California, Los Angeles, Los Angeles, California, United States
,
Bilwaj Gaonkar
1   Department of Neurosurgery, University of California, Los Angeles, Los Angeles, California, United States
,
Quinton Gopen
2   Department of Head and Neck Surgery, University of California, Los Angeles, Los Angeles, California, United States
,
Isaac Yang
1   Department of Neurosurgery, University of California, Los Angeles, Los Angeles, California, United States
2   Department of Head and Neck Surgery, University of California, Los Angeles, Los Angeles, California, United States
3   Department of Radiation Oncology, University of California, Los Angeles, Los Angeles, California, United States
4   Jonsson Comprehensive Cancer Center, University of California, Los Angeles, Los Angeles, California, United States
› Author Affiliations
Further Information

Publication History

29 December 2016

28 February 2017

Publication Date:
18 April 2017 (online)

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Abstract

Objectives Superior semicircular canal dehiscence (SSCD) results from a defect in the middle cranial fossa floor. One challenge during SSCD repair is the lack of a consistent landmark. This study proposes a reference point above the external auditory canal at the level of the zygoma as the inferior craniectomy edge during surgery.

Design This is a retrospective review of patients with SSCD.

Setting/Participants A total of 72 cases of SSCD in 60 patients were repaired via a middle fossa approach at a single institution.

Main Outcome Measures The distance from the proposed reference point to the dehiscence was statistically analyzed using Shapiro–Wilk's goodness-of-fit test and Student's t-test.

Results Average distance for all patients was 28.84 ± 2.22 mm (range: 22.96–33.43). Average distance for females was 29.08 mm (range: 24.56–33.43) versus 28.26 mm (range: 22.96–32.36) for males. There was no difference in distance by sex (p = 0.174). The distance measurements followed a normal distribution with 95% of the patients between 24.49 and 33.10 mm.

Conclusion This study analyzed a potential reference point during a middle fossa approach for SSCD surgery. The distance from this reference point to the SSCD was found to be consistent and may serve as a readily identifiable landmark in localizing the dehiscence.

Keywords

superior semicircular canal dehiscence - syndrome - distance - measurement
 

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