Fig. 3. A fluoroscopic image showing an optimal needle positioning in the patient with TN during percutaneous RFTC, and enlarged view of which is shown in the rectangle. A dotted circle, vertical and horizontal lines indicate the FO itself and imaginary lines quadrisecting the area of the FO, respectively. TN: trigeminal neuralgia, RFTC: radiofrequency thermocoagulation, FO: foramen ovale.
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