Facial Nerve Preservation for Supraorbital Approaches: Anatomical Mapping Based on Consistent Landmarks.

Department

Neurosurgery

Document Type

Article

Abstract

BACKGROUND: The supraorbital keyhole approach (SOKA) provides a safe and advantageous access to the anterior cranial fossa. The implemented skin incision varies depending on surgeon's preferences and requirements. Facial nerve (FN) injury might appear in up to 5.6% of patients. There is a lack of validated tenets for avoiding FN injury.

OBJECTIVE: To define a safety area for FN preservation during a SOKA.

METHODS: Ten dried skulls and 5 injected cadaveric heads (10 sides) were used. A Cartesian frame was created with its horizontal axis at the level of the supraorbital notch and the vertical axis just lateral to the frontozygomatic junction (FZj). FNs were dissected and points along their course were registered and transferred to the Cartesian frame.

RESULTS: Ten microscopic dissections of the FN were performed preserving all branches. A safety area could be defined 8 mm superior and 10 mm inferior to the FZj extending medially to the supraorbital notch and beyond. A 20 mm2 area superior and lateral to the FZj provided low probability (≤10%) of injuring the FN. Similarly, starting 4 mm inferior to the FZj, a lateral safety area was also found. A probabilistic colored heat map was built to represent the results.

CONCLUSION: We provide a "safety zone" for a SOKA incision in which the probability to encounter the FN is low. Clinical studies following our method may validate our findings and add evidence to the tenets for minimizing morbidity related to the SOKA incision.

Publication Date

1-1-2020

Publication Title

Oper Neurosurg (Hagerstown)

ISSN

2332-4260

Volume

18

Issue

1

First Page

52

Last Page

59

PubMed ID

31081891

Digital Object Identifier (DOI)

10.1093/ons/opz084

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