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. 2017 Oct 10;15(2):184–193. doi: 10.1093/ons/opx205

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© Congress of Neurological Surgeons 2017.

This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs licence (http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial reproduction and distribution of the work, in any medium, provided the original work is not altered or transformed in any way, and that the work is properly cited. For commercial re-use, please contact journals.permissions@oup.com

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FIGURE 6. — Extradural drilling. A, A patient with ataxia and hemiparesis was found to have large anterior foramen magnum meningioma, as seen here in this noncontrast sagittal MRI. The patient underwent a left far lateral craniectomy. B, The HUD was used to outline the tumor (yellow), vertebral artery (red), and brainstem (green). A C1 laminectomy was performed to reach the bottom of the tumor and drilling of the occipital condyle was tailored to reach the lateral aspect of the tumor as well as the intracranial vertebral artery.