Novel method of locating the foramen ovale: a stable chair with solid legs

Identification of Foramen Ovale With H-Figure Fluoroscopic Landmark Improves Treatment Outcomes in Idiopathic Trigeminal Neuralgia

“…[4][5][6] Recently, we developed the H-figure approach as a novel and easily recognizable fluoroscopic landmark that significantly facilitates the visualization of FO with fewer fluoroscopic shots and shorter procedure time. 7,8 The H-figure landmark consists of 2 vertical lines from the medial border of mandible and lateral edge of maxilla and 1 horizontal line from the superior line of petrous ridge of temporal bone (S-P-T line). With H-figure fluoroscopic landmark, the FO fluoroscopic view can be easily optimized above the S-P-T line at the center of the H-figure when the medial end of the temporomandibular joint is located midpoint between the lateral and medial borders of mandible.…”