Anterior and Posterior Facial Nerve Rerouting: A Comparative Study

Area of Science:

• Neurosurgery
• Otolaryngology
• Cranial nerve surgery

Background:

• Glomus jugular tumors type C and petroclival tumors require complex surgical approaches.
• The infratemporal fossa type A (IFT-A) and modified transcochlear approaches are utilized for these challenging resections.
• Facial nerve preservation is a critical surgical consideration in these procedures.

Purpose of the Study:

• To compare facial nerve functional outcomes following IFT-A with anterior rerouting versus the modified transcochlear approach with posterior rerouting.
• To evaluate the efficacy of anterior versus posterior rerouting techniques on facial nerve function.

Main Methods:

• Retrospective analysis of patients undergoing IFT-A or modified transcochlear approach for tumor removal.
• Assessment of facial nerve function using standardized grading scales (e.g., House-Brackmann) one year post-operatively.
• Comparison of outcomes between anterior rerouting (IFT-A) and posterior rerouting (modified transcochlear approach).

Main Results:

• Anterior rerouting (IFT-A) demonstrated excellent to good facial nerve function (94%, Grade I-III) one year after surgery.
• Posterior rerouting (modified transcochlear approach) resulted in good facial nerve function (70%, Grade III) at the one-year follow-up.
• IFT-A with anterior rerouting showed a higher rate of excellent to good facial nerve outcomes compared to the modified transcochlear approach with posterior rerouting.

Conclusions:

• Anterior rerouting in the IFT-A approach is associated with superior facial nerve functional outcomes for glomus jugular tumors.
• Posterior rerouting in the modified transcochlear approach provides good facial nerve function for petroclival tumors.
• Surgical technique and rerouting strategy significantly impact facial nerve preservation in complex skull base tumor resections.