Anatomical Variations of the First Vein Draining into the Anterior Superior Sagittal Sinus: Implications for the Transbasal Approach - Borghei-Razavi, Hamid; Eguiluz, Aldo; Truong, Huy Q.; Fernandez-Miranda, Juan; Kshettry, Varun; Recinos, Pablo (Journal of Neurological Surgery Part B: Skull Base, 2019)