Journal Pre-proof Embolization and open decompression of a giant aneurysm involving the P2 segment of the posterior cerebral artery Kyle P. O’Connor, BS, Allison E. Strickland, MD, Griffin Ernst, MD, Camille K. Milton, BS, Ahmed A. Cheema, MD, Bradley N. Bohnstedt, MD PII: S1878-8750(19)32496-9 DOI: https://doi.org/10.1016/j.wneu.2019.09.066 Reference: WNEU 13365 To appear in: World Neurosurgery Received Date: 12 July 2019 Revised Date: 11 September 2019 Accepted Date: 12 September 2019 Please cite this article as: O’Connor KP, Strickland AE, Ernst G, Milton CK, Cheema AA, Bohnstedt BN, Embolization and open decompression of a giant aneurysm involving the P2 segment of the posterior cerebral artery, World Neurosurgery (2019), doi: https://doi.org/10.1016/j.wneu.2019.09.066. This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. © 2019 Published by Elsevier Inc. Embolization and open decompression of a giant aneurysm involving the P2 segment of the posterior cerebral artery Kyle P. O’Connor, BS1; Allison E. Strickland, MD1; Griffin Ernst, MD1; Camille K. Milton, BS1; Ahmed A. Cheema, MD1; Bradley N. Bohnstedt, MD1 1 Department of Neurosurgery University of Oklahoma Health Sciences Center Oklahoma City, Oklahoma Corresponding Author: During Submission: After potential publication: Camille K. Milton, BS Bradley Bohnstedt, MD camille-milton@ouhsc.edu bradley-bohnstedt@ouhsc.edu Department of Neurosurgery University of Oklahoma Health Sciences Center 1000 N Lincoln Boulevard, Suite 4000 Oklahoma City, Oklahoma 73104 Tel: (405) 271-4912 Fax: (405) 271-3091 Running Title: Treatment of giant aneurysm Keywords: aneurysm, cerebrovascular, craniotomy, embolization, giant aneurysm, operative video, vascular neurosurgery Declarations of Funding: The authors have no funding disclosures for the content presented in this video Acknowledgements: none 1 Abstract 2 A 5-year-old girl presented to the clinic with chronic intermittent left-sided headaches. The 3 patient underwent CT angiography which demonstrated a giant aneurysm that involved the P2 4 segment of the left posterior cerebral artery. Before proceeding with treatment, consent was 5 obtained from the patient’s legal guardian. A trapping-evacuation technique was used for 6 proximal control and decompression so that a clip could be placed on the proximal inflow artery 7 of the aneurysm. First, embolization was performed for aneurysm trapping and parent vessel 8 sacrifice. Two days later, the patient was taken to the operating room for open surgical 9 decompression, clipping, and reconstruction. Heparin was administered during the embolization 10 stage of the operation. The patient did well post-operatively and was discharged home. 3-month 11 follow-up evaluation demonstrated a right superior homonymous quadrantanopia and no other 12 neurological deficits. Abbreviations No abbreviations used Statement of disclosure Declarations of interest: none