Abstract
Background/Study Aims Percutaneous radiofrequency trigeminal rhizotomy (RTR) is a standardized treatment
for trigeminal neuralgia, yet it has been associated with serious complications related
to the cannulation of the foramen ovale. Some of these complications, such as carotid
injury, are potentially lethal. Neuronavigation was recently proposed as a method
to increase the procedure's safety. All of the techniques described so far rely on
pre- or intraoperative computed tomography scanning. Here we present a simple method
based on magnetic resonance imaging (MRI) (radiation free) used to target the foramen
ovale under navigation guidance.
Patients/Material and Methods We retrospectively analyzed nine patients who had undergone navigated percutaneous
RTR based solely on preoperative MRI and compared them with 35 patients who underwent
conventional RTR guided by fluoroscopy. We analyzed immediate and late outcome and
categorized the results into pain free, > 70% pain reduction, and persistent pain.
We also compared groups in terms of the duration of the procedure and the complication
rates. Here we describe the navigation method in detail and review the anatomical
landmarks for target definition.
Results The duration of the surgical procedure was similar in both groups (32.1 in the standard
technique versus 34.5 minutes with navigation; p = 0.5157). There was no significant difference between groups regarding pain reduction
at the immediate (p = 1.0) or late follow-up (p = 0.6284) time points. Furthermore, no serious complications were observed in the
navigated group.
Conclusions We present a simple radiation-free method for neuronavigation-assisted percutaneous
RTR. This method proved to be safe and effective, and it is especially recommended
for young, inexperienced neurosurgeons.
Keywords
trigeminal neuralgia - neuronavigation - high-resolution MRI - percutaneous rhizotomy