Faculty Profiles - OOISHI Makoto

Papers - OOISHI Makoto

Division display 141 - 153 of about 153 ／ All the affair displays >>

Etiopathological factors related to hydrocephalus associated with vestibular schwannoma. International journal

Masafumi Fukuda, Makoto Oishi, Tadashi Kawaguchi, Masatoshi Watanabe, Tetsuro Takao, Ryuichi Tanaka, Yukihiko Fujii

Neurosurgery 61 ( 6 ) 1186 - 92 2007.12

Language：English Publishing type：Research paper (scientific journal)

OBJECTIVE: We retrospectively analyzed various clinical factors to determine whether or not these factors are etiopathologically related to the development of hydrocephalus in patients with vestibular schwannomas. METHODS: There were 68 patients (29 men, 39 women) in this study who underwent resection of a vestibular schwannoma. The age at the time of surgery ranged from 19 to 76 years (mean age, 51.4 yr). The maximum diameter of the tumor in the cerebellopontine cistern ranged from 0 (localized within the internal auditory canal) to 56 mm (mean, 32.0 +/- 12.9 mm). Cerebrospinal fluid (CSF) protein concentration in the cerebellomedullary cistern was measured intraoperatively in all patients. RESULTS: Sixteen (23.5%) of the 68 patients exhibited radiographic evidence of hydrocephalus. Univariate analysis of various factors revealed that both tumor size and CSF protein concentration were positively related to development of hydrocephalus (P < 0.05 and P < 0.01, respectively). However, in multiple logistic regression analysis, only the CSF protein concentration was predictive for development of hydrocephalus (P = 0.022). There was a trend toward increased CSF protein concentration in patients with a large tumor (> or = 40 mm) compared with those with a small tumor (< 40 mm) (P = 0.06). CONCLUSION: A high CSF protein concentration in fluid from the cerebellomedullary cistern is one of the most important factors contributing to hydrocephalus associated with vestibular schwannoma. It is important to judge whether or not any further treatment is required for hydrocephalus, in addition to tumor resection, especially in patients with communicating hydrocephalus.

PubMed

researchmap

[The utility of presurgical simulation of microvascular decompression by MR virtual endoscopy].

Makoto Oishi, Masafumi Fukuda, Tetsuro Takao, Go Ishida, Mitsuya Sato, Yukihiko Fujii

No shinkei geka. Neurological surgery 35 ( 11 ) 1087 - 95 2007.11

Language：Japanese Publishing type：Research paper (scientific journal)

OBJECTIVE: We conducted the present study to assess the utility of virtual endoscopy (VE) created by volume rendering of MR images in presurgical simulation for trigeminal neuralgia (TN) and hemifacial spasm (HFS). METHODS: In 12 patients (six with TN and six with HFS), we presurgically evaluated the anatomy of the cerebellopontine angle (CPA) region and simulated an appropriate surgical approach by VE of heavy T2-weighted imaging and MR angiography. RESULTS: The three-dimensional (3-D) relations of neurovascular structures in the CPA region were compatible between on-VE and on-the-intraoperative view in all patients. The compression sites and the major offending vessels were correctly depicted, except for two small branches as the offending vessel. The other important structures affecting the surgical procedure were identified as major petrosal veins in all patients with TN, a vertebral artery in three with HFS, and a large cerebellar flocculus in three with HFS. Transposition of the offending vessels was performed as simulated in all patients with TN and in three patients with HFS. All patients had an excellent surgical outcome. CONCLUSIONS: Presurgical simulation by VE in patients with TN and HFS is a novel method that provides excellent visualization of the 3-D relations of neurovascular structures in the CPA region and allows us to accomplish successful and safe surgery.

PubMed

researchmap

Stereotactic radiofrequency thermocoagulation for hypothalamic hamartoma with intractable gelastic seizures. International journal

Junpei Homma, Shigeki Kameyama, Hiroshi Masuda, Takehiko Ueno, Ayataka Fujimoto, Makoto Oishi, Masafumi Fukuda

Epilepsy research 76 ( 1 ) 15 - 21 2007.8

Language：English Publishing type：Research paper (scientific journal)

Management of hypothalamic hamartoma with intractable gelastic epilepsy remains controversial. We have used stereotactic thermocoagulation for treatment of hypothalamic hamartoma with intractable gelastic epilepsy since 1997. Herein, we review our experience in five cases to clarify the usefulness of this treatment. A total of five patients with hypothalamic hamartoma were treated by stereotactic thermocoagulation at our hospital during the period October 1997 through February 2004. In all patients, the hamartoma was less than 10mm in diameter and was located on the floor of the third ventricle with sessile attachment to the wall. To identify ictal onset, chronic intracranial electroencephalography was performed in three patients with the use of a depth electrode implanted in the hamartoma. Attempts were made to induce gelastic seizure by electrical stimulation of the hamartoma in three patients. After magnetic resonance imaging-guided targeting, radiofrequency thermocoagulation of the boundary between the hamartoma and normal hypothalamus was performed to achieve disconnection effects. Marked reductions in seizure frequency were obtained in all cases, with three patients becoming seizure-free after the procedure. No intraoperative complications occurred except in one patient who experienced acute and transient panidrosis with hot flushes during coagulation. Our results suggest that stereotactic thermocoagulation of hypothalamic hamartoma is an acceptable treatment option for patients with intractable gelastic seizures.

PubMed

researchmap

[A case of solitary fibrous tumor in the cerebral convexity indicating its non-dural origin].

Masakazu Sano, Akihiko Saito, Yasushi Nishihira, Makoto Oishi, Akiyoshi Kakita, Hitoshi Takahashi, Yukihiko Fujii

No shinkei geka. Neurological surgery 35 ( 7 ) 697 - 702 2007.7

Language：Japanese Publishing type：Research paper (scientific journal)

We report a case of solitary fibrous tumor (SFT) in the cerebral convexity, and present characteristic radiological and surgical findings to determine its origin. The patient was a 59-year-old man with mental dullness and mild gait disturbance. CT scan and MR images showed a highly enhanced large mass lesion mimicking a meningioma in the left parietal convexity. However, neither dural enhancement nor tail sign indicative of meningioma was observed. Angiography showed prominent feedings from branches of the internal carotid and basilar arteries rather than the external carotid artery. For this reason, presurgically, we suggested hemangiopericytoma or other specific meningiomas as a differential diagnoses. Surgery confirmed that the tumor had no attachment to the dura mater and was covered by the arachnoid membrane. The bottom of the tumor adhered tightly to brain tissue. The origin was considered to be the brain surface, pia mater or a part of the arachnoid membrane. Histopathologically, the tumor was diagnosed as a SFT with findings of "attemless pattern" and diffuse CD34 staining. The radiological and surgical findings of the present case indicated in the cerebral convexity as a unique site of origin of SFT.

PubMed

researchmap

[New diagnostic imaging methods in neurosurgery: advent of anatomical and functional neuroimaging].

Makoto Oishi, Takeo Uzuka, Yuichiro Yoneoka, Yukihiko Fujii, Hironaka Igarashi

No shinkei geka. Neurological surgery 35 ( 3 ) 291 - 300 2007.3

Language：Japanese Publishing type：Research paper (scientific journal)

Progress in imaging techniques has contributed to improvements in reliable diagnosis and surgical decision making in neurosurgery. From the viewpoint of neurosurgeons, there are two major needs in the development of imaging techniques. One is greater accuracy in demonstrating the anatomy of the brain at microscopic resolutions and the other is visualization of function or metabolism that is invisible on surgical views. Use of 3.0 T magnetic resonance imaging (MRI) in clinical patients has revealed anatomy appropriate for microsurgery at high resolution, and three-dimensional reconstruction of MRI on high-specification computers helps neurosurgeons to understand the anatomy of the brain in individual patients. Functional imaging methods such as functional MRI, positron emission tomography, and magnetoencephalography have provided new insights in brain surgery, visualizing various cerebral functions on anatomic images. Recently, diffusion tensor imaging is used to visualize neural tracts passing through subcortical white matter and MR spectroscopy is used to show the metabolic status of lesions. These tools are also forms of functional imaging. New noninvasive imaging techniques are still being developed to visualize function more easily. Here, we summarize the roles of recent imaging techniques in our previous studies and discuss the future of imaging in neurosurgery.

PubMed

researchmap

Unusual giant cerebral venous varix associated with brain abscess: variant of hereditary hemorrhagic telangiectasia--case report.

Makoto Oishi, Osamu Sasaki, Shinji Nakazato, Kenji Suzuki, Keiko Kitazawa, Tetsuro Takao, Tetsuo Koike

Neurologia medico-chirurgica 47 ( 2 ) 74 - 8 2007.2

Language：English Publishing type：Research paper (scientific journal)

A 35-year-old man suffered secondary generalized tonic-clonic convulsions due to a large brain abscess. Neuroimaging incidentally revealed another tumor-like lesion. Cerebral angiography confirmed that the lesion was an unusual giant venous varix associated with a high-flow pial arteriovenous fistula (AVF) and showed one more small arteriovenous malformation (AVM). Pulmonary AVF, which can cause brain abscess, was also detected. Surgical ligation of the AVF and removal of the small AVM via individual craniotomies resulted in successful extirpation of the cerebrovascular malformations. Although the typical mucocutaneous symptoms were absent in this patient, the combination of arteriovenous anomalies was highly suggestive of hereditary hemorrhagic telangiectasia.

PubMed

researchmap

Magnetoencephalography in patients with tuberous sclerosis and localization-related epilepsy. International journal

Takanori Kamimura, Jun Tohyama, Makoto Oishi, Noriyuki Akasaka, Osamu Kanazawa, Mutsuo Sasagawa, Mitsuhiro Kato, Kousaku Ohno, Hiroshi Masuda, Shigeki Kameyama, Makoto Uchiyama

Epilepsia 47 ( 6 ) 991 - 7 2006.6

Language：English Publishing type：Research paper (scientific journal)

PURPOSE: To clarify the usefulness of magnetoencephalography (MEG) for diagnosis of the spatial relations between spike foci and suspicious epileptogenic tubers on MRI in patients with tuberous sclerosis (TS) and to compare MEG spike foci with single-photon emission computed tomography (SPECT) findings. METHODS: We analyzed magnetic fields of epileptic spike discharges in 15 patients with TS and localization-related epilepsy (LRE) by using MEG (a whole-head 204-channel magnetometer system). We investigated the spatial relation between the equivalent current dipoles (ECDs) of interictal spike discharges and visible cortical tubers on MRI. We also compared results of MEG and MRI with SPECT findings. RESULTS: MEG detected a cluster of ECDs around one cortical tuber in six of 15 patients and clusters of ECDs around two cortical tubers in five patients. Interictal SPECT was disappointing in detection of epileptic foci in TS. However, MEG spike foci showed spatial consistency with ictal hyperperfusion areas in two patients. Three patients with single ECD clusters underwent surgical treatment: two have been seizure free, and one has obtained seizure reduction of >90%. CONCLUSIONS: ECDs were located around visible tuber nodules. MEG enabled precise localization of the epileptic foci and provided crucial information for surgical treatment in patients with TS and partial epilepsy. TS patients showing a single ECD cluster on MEG may be appropriate candidates for surgical treatment.

PubMed

researchmap

Single and multiple clusters of magnetoencephalographic dipoles in neocortical epilepsy: significance in characterizing the epileptogenic zone. International journal

Makoto Oishi, Shigeki Kameyama, Hiroshi Masuda, Jun Tohyama, Osamu Kanazawa, Mutsuo Sasagawa, Hiroshi Otsubo

Epilepsia 47 ( 2 ) 355 - 64 2006.2

Language：English Publishing type：Research paper (scientific journal)

PURPOSE: To characterize the epileptogenic zone in neocortical epilepsy (NE) by using magnetoencephalography (MEG). METHODS: We defined and compared locations of single and multiple clusters of equivalent current dipoles (ECDs) for interictal spikes with MRI findings, ictal-onset zones (IOZs) from subdural electroencephalography (SDEEG), resected areas, and postsurgical outcomes of 20 patients who underwent cortical resection for medically intractable NE. RESULTS: Fourteen patients had single clusters; six had multiple clusters. Overlap of clusters and IOZs defined group A (nine patients), in which a single cluster coincided with the IOZ; group B1 (four patients), in which a single cluster was within or partially overlapped the IOZ; group B2 (five patients), in which multiple-cluster sections overlapped IOZs; group C (two patients; one single; one multiple), in which no overlap was seen. More single clusters (nine of 14) than multiple clusters (none of six) coincided with the IOZ (p = 0.014). More patients with single clusters (10 of 14) than patients with multiple clusters (one of six) had seizure-free outcomes (p = 0.049). Eight of nine patients in group A, versus three of 11 in groups B1, B2, and C, achieved seizure-free outcomes (p = 0.0098). Correlations between MRI findings and postsurgical outcomes were not statistically significant; eight of 13 patients with single lesions, one of four with no lesions, and two of three with multifocal lesions had seizure-free outcomes. CONCLUSIONS: In neocortical epilepsy, MEG ECD clusters correlated with SDEEG IOZs. Single clusters indicated discrete epileptogenic zones that required complete resection for seizure-free outcome. Multiple clusters necessitated that the multiple or extensive epileptogenic zones be completely identified and delineated by SDEEG.

PubMed

researchmap

Characterizing magnetic spike sources by using magnetoencephalography-guided neuronavigation in epilepsy surgery in pediatric patients. International journal

Koji Iida, Hiroshi Otsubo, Yuuri Matsumoto, Ayako Ochi, Makoto Oishi, Stephanie Holowka, Elizabeth Pang, Irene Elliott, Shelly K Weiss, Sylvester H Chuang, O Carter Snead 3rd, James T Rutka

Journal of neurosurgery 102 ( 2 Suppl ) 187 - 96 2005.3

Language：English Publishing type：Research paper (scientific journal)

OBJECT: The authors sought to validate magnetoencephalography spike sources (MEGSSs) in neuronavigation during epilepsy surgery in pediatric patients. METHODS: The distributions of MEGSSs in 16 children were defined and classified as clusters (Class I), greater than or equal to 20 MEGSSs with 1 cm or less between MEGSSs; small clusters (Class II), 6 to 19 with 1 cm or less between; and scatters (Class III), less than 6 or greater than 1 cm between spike sources. Using neuronavigation, the MEGSSs were correlated to epileptic zones from intra- and extraoperative electrocorticography (ECoG), surgical procedures, disease entities, and seizure outcomes. Thirteen patients underwent MEGSSs: nine had clusters; two had small clusters, one with and one without clusters; and three had scatters alone. All 13 had scatters. Clusters localized within and extended from areas of cortical dysplasia and at margins of tumors or cystic lesions. All clusters were colocalized to ECoG-defined epileptic zones. Four of 10 patients with clusters and/or small clusters underwent complete excisions, and six underwent partial excision with or without multiple subpial transections. In the three patients with scatters alone, ECoG revealed epileptic zones buried within MEGSS areas; these regions of scatters were completely excised and treated with multiple subpial transections. Coexisting scatters were left untreated in nine of 10 patients. Postoperatively, nine of 13 patients were seizure free; the four patients with residual seizures had clusters in unresected eloquent cortex. Three patients in whom no MEGSSs were demonstrated underwent lesionectomies and were seizure free. CONCLUSIONS: Magnetoencephalography spike source clusters indicate an epileptic zone requiring complete excision. Coexisting scatters remote from clusters are nonepileptogenic and do not require excision. Scatters alone, however, should be examined by ECoG; an epileptic zone may exist within these distributions.

PubMed

researchmap

Cortical activation in area 3b related to finger movement: an MEG study. International journal

Makoto Oishi, Shigeki Kameyama, Masafumi Fukuda, Kuniko Tsuchiya, Toru Kondo

Neuroreport 15 ( 1 ) 57 - 62 2004.1

Language：English Publishing type：Research paper (scientific journal)

To evaluate cortical activation reflecting sensory feedback after finger movement, we recorded movement-related cerebral fields (MRCFs) following voluntary finger movement and somatosensory evoked fields for mixed (median) and pure cutaneous (radial) nerve stimulations (mSEFs and rSEFs) in six normal subjects. Equivalent current dipoles for movement-evoked field 1 (MEF1) in MRCFs and the component (70m) obtained in mSEFs, not clearly in rSEFs, were similarly distributed in each subject. They were located in area 3b, but both mean locations were significantly (p < 0.01) medial to N20m in mSEFs. MEF1 and 70m reflect similar cortical activities related to finger movement and have the same neuronal generator in area 3b, which is different from that of N20m.

PubMed

researchmap

Epileptic spikes: magnetoencephalography versus simultaneous electrocorticography. International journal

Makoto Oishi, Hiroshi Otsubo, Shigeki Kameyama, Nobuhito Morota, Hiroshi Masuda, Masaomi Kitayama, Ryuichi Tanaka

Epilepsia 43 ( 11 ) 1390 - 5 2002.11

Language：English Publishing type：Research paper (scientific journal)

PURPOSE: To test the sensitivity of extracranial magnetoencephalography (MEG) for epileptic spikes in different cerebral sites. METHODS: We simultaneously recorded MEG and electrocorticography (ECoG) by using subdural electrodes with 1-cm interelectrode distances for one patient with lateral frontal epilepsy and one patient with basal temporal epilepsy. We analyzed MEG spikes associated with ECoG spikes and compared the maximal amplitude and number of electrodes involved. We estimated and evaluated the locations and moments of the equivalent current dipoles (ECDs) of MEG spikes. RESULTS: In patient 1, MEG detected 100 (53%) of 188 ECoG lateral frontal spikes, including 31 (46%) of 67 spikes that activated three subdural electrodes. MEG spike amplitudes correlated with ECoG spike amplitudes and the number of electrodes activated (p < 0.01). ECDs were perpendicular to the superior frontal sulcus. In patient 2, MEG detected 31 (26%) of 121 ECoG basal temporal spikes, but none that activated only three subdural electrodes. ECDs were localized in the entorhinal and parahippocampal gyri, oriented perpendicular to those basal temporal cortical surfaces. The ECD strength was 136.6 +/- 71.5 nAm in the frontal region, but 274.5 +/- 150.6 nAm in the temporal region (p < 0.01). CONCLUSIONS: When lateral frontal ECoG spikes extend >3 cm2 across the fissure, MEG can detect >50%, correlating with spatial activation and voltage. In the basal temporal region, MEG requires higher-amplitude discharges over a more extensive area. MEG shows a significantly higher sensitivity to lateral convexity epileptic discharges than to discharges in isolated deep basal temporal regions.

PubMed

researchmap

Fusiform gyrus epilepsy: the use of ictal magnetoencephalography. Case report. International journal

Makoto Oishi, Shigeki Kameyama, Nobuhito Morota, Masaru Tomikawa, Manabu Wachi, Akiyoshi Kakita, Hitoshi Takahashi, Ryuichi Tanaka

Journal of neurosurgery 97 ( 1 ) 200 - 4 2002.7

Language：English Publishing type：Research paper (scientific journal)

The authors report successful presurgical identification of an epileptic focus in the fusiform gyrus by using ictal magnetoencephalography (MEG), which was performed with the aid of an advanced whole-brain neuromagnetometer. A 22-year-old man had suffered from medically refractory complex partial seizures since he was 10 years of age. Seizure symptoms, magnetic resonance imaging, and ictal single-photon emission computerized tomography examinations indicated right temporal lobe epilepsy; however, ictal electroencephalography, including sphenoidal recordings, failed even to lateralize the seizure focus. The MEG studies revealed that equivalent current dipoles of interictal activities were scattered bilaterally around the medial temporal structures, but those of ictal onset and postictal activities formed a cluster in the left fusiform gyrus. After confirmation of each ictal and interictal MEG finding by using long-term electrocorticography recordings, focal cortical resection of the left inferior temporal and fusiform gyri was performed. The histopathological diagnosis was cortical dysplasia, and the patient has achieved a good seizure outcome, now 15 months after the operation. Ictal and also postictal MEG may be more specific than interictal MEG for identifying the ictal onset zone.

PubMed

researchmap

[Presurgical functional mapping of the sensorimotor area using evoked magnetic fields].

Makoto Oishi, Shigeki Kameyama, Masatoshi Watanabe, Tadashi Kawaguchi, Nobuhito Morota, Masaru Tomikawa, Hiroshi Masuda, Hideaki Takahashi, Ryuichi Tanaka

No shinkei geka. Neurological surgery 30 ( 4 ) 391 - 7 2002.4

Language：Japanese Publishing type：Research paper (scientific journal)

In the present study, we evaluated the usefulness of magnetoencephalography (MEG) for presurgical identification of not only the central sulcus by somatosensory evoked magnetic fields (SEFs), which is a well-known, reliable technique, but also the primary hand motor area by movement-related cerebral magnetic fields (MRCFs). Subjects were 10 patients with brain tumor (6 glial tumors, 3 cavernous angiomas, and 1 metastatic tumor) around the sensorimotor area. Identification of the central sulcus by SEF responses to multiple sites of stimulation (median nerve, tibial nerve, thumb, and lower lip) was performed in all patients, and identification of the hand motor area by MRCF responses to the index finger extension task was made in 9. All MEG data were superimposed on sectional or three-dimensional magnetic resonance (MR) images. The central sulcus was clerAly identified by SEFs in all patients, even in 5 whose MR images showed severe distortion, and the primary hand motor area was identified by MRCFs in 6 of 9 patients. The central sulcus and primary motor area identified by MEG were confirmed by cortical recording of somatosensory evoked potentials in response to median nerve stimulation in 7 patients and motor evoked potentials in response to direct cortical stimulation in 5. All patients underwent tumor removal guided by functional mapping by MEG and experienced no surgical complications. In conclusion, MEG is a useful tool in presurgical functional mapping of the sensorimotor area. This is the first report of a case in which identification of the hand motor area by MRCFs was used in a clinical setting.

PubMed

researchmap

　 PREV - NEXT 　

<OOISHI Makoto>

Papers - OOISHI Makoto