Validation of Härtel Surface Anatomical Landmarks for Locating the Foramen Ovale: A Computed Tomography Scan Analysis and Revised Technique Description.

Background And Objectives: Härtel triangle provides surface landmarks for locating the foramen ovale (FO) when performing trigeminal nerve percutaneous procedures. Although widely adopted in clinical practice, there is no report that these landmarks have ever been formally validated through modern imaging techniques. Here we aim to validate Härtel anatomical landmarks using computed tomography scans and propose technical considerations for percutaneous trigeminal procedures.