---- Essayed et al. from the Department of Neurosurgery, [[Brigham and Women's Hospital]], Harvard Medical School, Boston, Massachusetts, USA.presented a case of a [[chondrosarcoma]] centered in the [[upper clivus]] and eroding the right [[posterior clinoid]], analogous to the location of a giant [[basilar apex aneurysm]]. Detailed study of the tumor extension, bony invasion, and relationship with neuroanatomy dictated the most effective surgical approach. [[Neuronavigation]] and [[intraoperative magnetic resonance imaging]] (MRI) facilitated the [[gross total resection]] of the tumor in the [[Advanced Multimodality Image-Guided Operating suite]] (AMIGO). Achieving a gross total tumor removal of this World Health Organization (WHO) grade I chondrosarcoma, adjuvant irradiation can be withheld and the patient monitored with serial imaging. The patient did well after the surgery ((Essayed W, Mooney MA, Al-Mefty O. Transcavernous Resection of an Upper Clival Chondrosarcoma: "Cavernous Sinus as a Route": 2-Dimensional Operative Video. Oper Neurosurg (Hagerstown). 2021 May 3:opab043. doi: 10.1093/ons/opab043. Epub ahead of print. PMID: 33940624.)).