Prof. Michihiro KohnoJapan
Department of Neurosurgery, Tokyo Medical University
| 2013/04 to present | Professor & Chairman, Department of Neurosurgery, Tokyo Medical University |
| 2023/07 to present | President of the Japanese Society for Skull Base Surgery (JSBS) |
| 2021/05 to present | Co-Representative of the Japanese Society of Acoustic Neuroma (JSAN) |
| 1981 - 1987 | Hamamatsu University School of Medicine |
| 1993 - | Japanese Board of Neurosurgery |
| 1999 - | PhD Degree (University of Tokyo) |
| 2004 - 2013 | Director of Neurosurgery, Tokyo Metropolitan Police Hospital |
| 1995 - 2004 | Director of Department of Neurosurgery, Fuji Brain Institute & Hospital |
| 2016 - | Active member of World Academy of Neurological Surgeons (WANS) |
| 2017 - 2024 | World Federation of Neurosurgical Societies (WFNS) Education Course faculty member |
Vestibular schwannoma and cerebellopintine angle tumor surgery, skull base surgery
He has been performing surgery for cerebellopontine angle tumors about 150 cases including 100 vestibular schwannomas per year, and his surgical experience is over 2500 CPA tumors including more than 1800 vestibular schwannomas.
Vestibular schwannoma surgery - monitoring, dissection and hemostasis -
1110 09:50-10:00
AASNS / AANS Joint Session "Spetzler Symposium"/305
[Background] Surgery for large vestibular schwannomas is very difficult to obtain good surgical results, and it requires tips and devices to achieve both high resection rate and high preservation ratio of facial and/or hearing function. [Patients and methods] The author's personal surgical experience is 1869 patients (Koos IV: 1170). I have been using intraoperative continuous facial nerve monitoring with direct electrical stimulation on the root exit zone, which is a method for checking facial EMGs during tumor excision in real time. Regarding the tumor dissection, being concious of '3 dissection planes' which include facial or cochlear nerve it self, the membrane derived from the vestibular nerve (very thin tumor capsule), and the residual tumor, makes high functional preservation rates of facila and cochlear nerves. Surgicel® cotton balls are very useful for hemostasis from vestibular schwannomas. [Results] Overall functional preservation rate of the facial nerve (House and Brackmann grade 1 or 2 at 1 year after surgery) was 97.7% and hearing preservation ratio was 63.2% with a 96.9% mean resection rate. [Conclusions] Under a real-time intraoperative continuous facial nerve monitoring with direct electrical stimulation, conciousness of 3 dissection planes and hemostasis with Surgicel cotton balls® are very useful to increase the tumor excision rate while avoiding severe postoperative facial nerve palsy in vestibular schwannoma surgery.
Surgery for jugular foramen tumors
1109 10:10-10:20
AASNS & WANS Joint Seminar/305
【Background】Surgery for jugular foramen tumors is very difficult to obtain good surgical results. Selecting an appropriate approach and strict intraoperative nerve monitorings are mandatory for excellent surgical results. 【Patients】The author surgically treated 203 patients with jugular foramen tumors, including 93 jugular foramen schwannomas, 17 hypoglossal schwannomas, 51 meningiomas, 25 glomus jugulare tumors and 17 others. Intraoperative continuous vagus nerve monitoring by direct electrical stimulation of vagus nerve was used in surgery for these tumors. 【Results】Vagus nerve function after surgery was generally good and hearing improvement was observed in about 40% of patients with jugular foramen schwannomas.【Conclusions】Using intraoperative continuous vagus nerve monitoring is useful in surgery for jugular foramen tumors. Postoperative hearing improvement was frequently observed in patients with jugular foramen schwannomas.
Cerebellopontine angle tumor surgery
1109 16:30-16:40
Video Presentation/304B