“Chamberlain’s Line, Clivus-Canal Angle, Welcker’s Basal Angle, Boogaard’s Angle, and Foramen Magnum Angle: A Brief Review for Type B Basilar Invagination”. Neurological Surgery and Anatomy 1, no. 1 (April 19, 2024): 22–28. Accessed February 4, 2026. https://neurosurgeryanatomy.com/journal/article/view/9.