Posterior Fossa Re-Exploration for Recurrent Trigeminal Neuralgia: Operative Findings and Surgical Techniques

Area of Science:

• Neurosurgery
• Neurology
• Surgical Technology

Background:

• Microvascular decompression (MVD) is the primary surgical treatment for trigeminal neuralgia (TN).
• Recurrence of TN after MVD presents a significant challenge for neurosurgeons.
• Posterior fossa re-exploration is a critical intervention for recurrent TN cases.

Purpose of the Study:

• To evaluate the efficacy and outcomes of posterior fossa re-exploration for recurrent trigeminal neuralgia.
• To identify the causes of recurrence after initial MVD.
• To assess the safety and complications associated with re-exploration surgery.

Main Methods:

• Retrospective analysis of 15 patients undergoing posterior fossa re-exploration for recurrent TN.
• Retrosigmoid suboccipital surgical approach with intraoperative brainstem auditory evoked potentials (BAEP) monitoring.
• Documentation of intraoperative findings, surgical techniques, postoperative outcomes, and complications.

Main Results:

• Teflon adhesion was identified as the primary cause of recurrence in 14 out of 15 patients.
• Successful pain relief was achieved in 14 patients (12 complete, 2 partial) post-re-exploration.
• Postoperative facial numbness occurred in 6 patients, with all cases improving during follow-up; no hearing impairment was noted.

Conclusions:

• Teflon adhesion is a significant factor contributing to recurrent trigeminal neuralgia.
• Wet gelatin-assisted interposition and nerve combing are effective techniques for managing recurrent TN.
• Intraoperative BAEP monitoring is crucial for minimizing the risk of hearing loss during re-exploration.