Prof. Kenichi OYAMAJapan
International University of Health & Welfare Mita Hospital
| 2021 to present | Director & Professor, Dept. of Neurosurgery, International University of Health & Welfare Mita Hospital |
| 2022 to present | Executive board member, The Japanese Society for Hypothalamic & Pituitary Tumors |
| 2022 to present | Executive board member, International Society on Minimally Invasive Neurosurgery |
| 1990 - 1996 | School of Medicine, Nippon Medical School, Tokyo, Japan |
| 1998 - 2002 | Graduate School of Medicine, Nippon Medical School, Tokyo, Japan |
| Apr. 1999 - Mar.2000 | Research fellow, Dept. of Pathology at Tokai University, Kanagawa, Japan |
| Oct. 2011 - Oct. 2012 | Research fellow, Dept. of Neurological Surgery, University of Pittsburgh, USA |
| Nov. 2012 - Nov. 2013 | Research fellow, Dept. of Neurological Surgery at The Ohio State University, USA |
| Dec. 2013 - Sep. 2014 | Clinical fellow, Dept. of Neurosurgery at Lariboiresiere Hospital of Paris VII University, France |
cranial base surgery, endoscopic surgery, minimally invasive neurosurgery, keyhole surgery
Dr. Oyama completed his residency training in Department of Neurological Surgery at Nippon Medical School and research fellowship in Dept. of Pathology at Tokai University, Dept. of Neurological Surgery at University of Pittsburgh and Dept. of Neurological Surgery at The Ohio State University. He also finished his clinical fellowship in Dept. of Neurosurgery at Lariboiresiere Hospital of Paris VII University.
His clinical practice encompasses endoscopic- and open skull base surgery, and his research focuses on analysis of pituitary tumors, as well as technical development of minimally invasive skull base surgery.
Fully endoscopic keyhole transcranial surgery for various cranial base lesions
1109 16:35-16:45
Skull Base/304A
(Objectives) To show the utility of fully endoscopic keyhole surgery for various cranial base lesions.
(Subjects & Methods) Between August 2016 to April 2022, thirteen cranial base lesions (9 cranial base tumors, 3 arachnoid cysts, 1 AVM) were treated via fully endoscopic keyhole transcranial surgery. We used an endoscope integrated with a pneumatic holder (Endoarm, Olympus Co.). Various key hole approaches were performed, including two supraorbital-, two transorbital-, three subtemporal-, one suboccipital-, three occipital transtentorial-, and two infratentorial supracerebellar approaches.
(Results) An endoscope provided more clear and better visualization of cranial base lesions through a key hole than a microscope. Among 9 tumors and 1 AVM, gross total- and subtotal resection was achieved in 5 and 3 patients respectively. Effective cyst-cisternostomy was safely carried out in 3 of 3 patients with arachnoid cyst. All patients had an uneventful post operative course. One patient developed transient oculomotor palsy and one patient with a pineal tumor exhibited transient minor Parinaud syndrome. There was no mortality.
(Conclusions) Fully endoscopic key hole transcranial surgery is a safe and minimally invasive procedure and can be a considerable option in the management of various cranial base lesions.
Tips for reconstruction during endoscopic endonasal cranial base surgery
1109 16:25-16:35
Skull Base/304A
(Objective) To describe the tips for reconstruction during the endoscopic endonasal cranial base surgery
(Methods) For no or minor cerebrospinal fluid leakage (CSFL), we place some gelatin sponge in the sella and then close the dura matter roughly with a few stiches using 6-0 monofilament. For moderate CSFL, with obvious diaphragmatic defect, we place a fat tissue or DuraGen in the sella and then close the dura matter roughly with a few stiches. For high flow CSFL, we perform duraplasty using fat graft or fascia with several stiches, and then cover the cranial base with a vascularized nasoseptal flap.
(Conclusion) Various reconstructive technique should be applied depending on the skull base defect & CSF leak grading