Prof. Kyu Sung LeeSouth Korea
Yonsei University Health System
| 2017 to present | Professor Emeritus, YUHS |
| 2017 - 2024 | Professor Emeritus, Department of Neurosurgery, YUHS |
| 2011 - 2017 | Director, Brain Tumor Center, Gangnam Severance Hospital |
| 2005 - 2011 | Director, Neuro-oncology and Skull Base Surgery, Severance Hospital |
| 2022 - | Awarded WFNS Medal of Honor at WFNS 2022 Bogota |
| 2015 - 2024 | Honorary President, Asian-Australasian Society of Neurological Surgeons |
| 2014 - 2015 | President, Asian-Oceanian Skull Base Society |
| 2013 - 2017 | Chairman, WFNS Skull Base Surgery Committee |
| 2010 - 2012 | President, Korean Neurosurgical Society |
Skull Base Surgery, Neuro-oncology, Image Guided Surgery, Microsurgical Anatomy, Director of WFNS Education Center for Skull Base Surgery at Yonsei University
Professor Kyu-Sung Lee is the seventh chair of Yonsei University. In 1989, he introduced skull base tumor surgery in Korea. In 1993, he started the first cadaver workshop for skull base surgery in Korea at Yonsei. He was the president of the 14th AACNS, and the 13th AOICSBS. He served as the chair of the WFNS Skull Base Surgery Committee. He is the honorary president of the AASNS. He visited more than 70 cities worldwide to deliver lectures, cadaver course demonstrations, and seminars. As a result, he received WFNS Medal of Honor at WFNS at 2022 World Congress in Bogota.
Significance of Petrosal Approaches in the Era of Endoscopic Surgery
1110 13:50-14:00
AASNS / AANS Joint Session "Spetzler Symposium"/305
Petrosal approaches are classified into classic microsurgical approaches and endoscopic surgeries. Surgical approach is selected according to the extent of lesions and purpose of surgery. Kawase et al. developed anterior petrosal approach for treating lower basilar aneurysms, as it is a looking down surgery exposing ventral pons and basilar artery. Hakuba et al. developed posterior approach to reach retrochiasmatic craniopharyngiomas, as it is a looking up surgery providing wide exposure to the retrochiasmatic brainstem. Endoscopic approaches grant good exposure and visualization, but one must work in a crowded space with a limited trajectory. Extension of the endoscopic transorbital approach (ETOA) with lateral orbital rim osteotomy provides exposure to anterior cavernous sinus and anterior sphenoid area. ETOA could access the middle fossa, allowing amygdalohippocampectomy or removing temporal gliomas. When combined with anterior petrosectomy, petro-cavernous meningiomas and upper clival meningiomas could be removed. However, these combined and complicated approaches should be a complementary to classic skull base surgery and should be done in highly selected cases by experienced surgeons. It is recommended for young surgeons to learn how to use all kinds of surgical instruments, and learn how to do all approaches, to select the best one for each patient.
Approaches to the Jugular Foramen
1109 10:40-10:50
AASNS & WANS Joint Seminar/305
Approaches to the jugular foramen are anterolateral, lateral, and posterolateral according to region of interest. Posterior approach is done by removal of the jugular process of the occipital bone to access the posterior aspect of the foramen. By adding Infra-labyrinthine mastoidectomy will provide access to the lateral edge and upper part of the jugular bulb. The anterolateral approach enables access to the mid and lower clivus, jugular foramen, craniocervical junction, and cervical spine. In addition, it may include condylar resection and cervical and vertebral artery exposure. Infra-labyrinthine transmastoid route saves the labyrinth and facial nerve while sparing jugular bulb and vein. The location and extension of the tumors, and expected histopathology should define the surgical approach. Glomus jugular tumors may require sacrifice of jugular vein; however, jugular vein should be preserved in other tumors compressing the jugular vein. Infratemporal fossa Fisch type A approach is an old ENT technique good for theological education. It requires removal of ear canal and middle ear contents, anterior rerouting of the facial nerve, and closing the external auditory meatus all of which could be avoided by using other modern approaches. The surgical approach should be planned meticulously to achieve complete resection, as repeated surgery increases the possibility of lower cranial nerves injury. Understanding the microanatomy is essential to preserve the neurovascular structures.