Computer-Assisted Design Template Guided Percutaneous Radiofrequency Thermocoagulation through Foramen Rotundum for Treatment of Isolated V2 Trigeminal Neuralgia: A Retrospective Case-Control Study

Figure 1

Progress of designing simulative trajectory and CAD template. We set the target at the external opening of the FR and confirm the right location (point) on the axial (a), sagittal (b), and coronal (c) views, respectively. A simulated puncture trajectory (cylinder) through the pterygopalatine fossa was then designed on the 3D image (d). The examination should be performed in the direction of the trajectory (e) with no bony structures, and paramount tissues obstruct the approach (line). After deciding the final trajectory, a template with a support bracket and a guide cannula was designed on computer software (f).