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  1. Article: [Hypervascular Tumors such as Hemangioblastoma].

    Yoshida, Hiroki / Nakatomi, Hirofumi

    No shinkei geka. Neurological surgery

    2024  Volume 52, Issue 2, Page(s) 358–366

    Abstract: Hemangioblastomas are richly vascular tumors. Therefore, visualizing the vascular anatomy of their feeders and drainers is important for planning surgical excision. Preoperative three-dimensional computer graphic(3DCG)images are useful for determining ... ...

    Abstract Hemangioblastomas are richly vascular tumors. Therefore, visualizing the vascular anatomy of their feeders and drainers is important for planning surgical excision. Preoperative three-dimensional computer graphic(3DCG)images are useful for determining the number, location, and course of their feeders and drainers.
    MeSH term(s) Humans ; Hemangioblastoma/diagnostic imaging ; Hemangioblastoma/surgery ; Hemangioblastoma/blood supply
    Language Japanese
    Publishing date 2024-03-21
    Publishing country Japan
    Document type English Abstract ; Journal Article
    ZDB-ID 197053-7
    ISSN 1882-1251 ; 0301-2603
    ISSN (online) 1882-1251
    ISSN 0301-2603
    DOI 10.11477/mf.1436204920
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Transoral Robotic-Assisted Neurosurgery for Skull Base and Upper Spine Lesions.

    Muto, Jun / Tateya, Ichiro / Nakatomi, Hirofumi / Uyama, Ichiro / Hirose, Yuichi

    Neurospine

    2024  Volume 21, Issue 1, Page(s) 106–115

    Abstract: Objective: The application of the da Vinci Surgical System in neurosurgery is limited due to technical difficulties requiring precise maneuvers and small instruments. This study details the advantages and disadvantages of robotics in neurosurgery and ... ...

    Abstract Objective: The application of the da Vinci Surgical System in neurosurgery is limited due to technical difficulties requiring precise maneuvers and small instruments. This study details the advantages and disadvantages of robotics in neurosurgery and the reachable range of the transoral approach to lesions of the skull base and upper cervical spine.
    Methods: In a cadaver study, the da Vinci Xi robot, lacking haptic feedback, was utilized for sagittal and coronal approaches on 5 heads, facilitating dura suturing in 3, with a 30°-angled drill for bone removal.
    Results: Perfect exposure of all the nasopharyngeal sites, clivus, sellar, and choana, including the bilateral eustachian tubes, was achieved without any external incisions using this palatal split approach of transoral robotic surgery. The time required to perform a single stitch, knot, and complete single suture in robotic suturing of deep-seated were significantly less compared to manual suturing via the endonasal approach.
    Conclusion: This is the first report to show the feasibility of suturing the dural defect in deep-seated lesions transorally and revealed that the limit of reach in the coronal plane via a transoral approach with incision of the soft palate is the foramen ovale. This preclinical investigation also showed that the transoral robotic approach is feasible for lesions extending from the sellar to the C2 in the sagittal plane. Refinement of robotic instruments for specific anatomic sites and future neurosurgical studies are needed to further demonstrate the feasibility and effectiveness of this system in treating benign and malignant skull base lesions.
    Language English
    Publishing date 2024-03-31
    Publishing country Korea (South)
    Document type Journal Article
    ZDB-ID 3031654-6
    ISSN 2586-6591 ; 2586-6583
    ISSN (online) 2586-6591
    ISSN 2586-6583
    DOI 10.14245/ns.2448062.031
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Outcome of Visual Function after Removal of Tuberculum Sellae Meningioma Presenting with Scotoma at the Lower Visual Field Center.

    Seiya, Yosuke / Maruyama, Keisuke / Imai, Hiroya / Shiokawa, Yoshiaki / Nakatomi, Hirofumi

    NMC case report journal

    2024  Volume 11, Page(s) 55–59

    Abstract: Tuberculum sellae meningiomas commonly present as bitemporal hemianopia and loss of visual acuity due to optic nerve compression. Two female patients (48 and 58 years old) presented with a small scotoma at the lower visual field center due to tuberculum ... ...

    Abstract Tuberculum sellae meningiomas commonly present as bitemporal hemianopia and loss of visual acuity due to optic nerve compression. Two female patients (48 and 58 years old) presented with a small scotoma at the lower visual field center due to tuberculum sellae meningioma (25 and 10 mm, respectively). Despite the fact that their visual field defect was not very large, daily activities, including walking or reading were hindered. By the total removal of the tumors in both patients, the scotoma was cured and daily activities recovered. When patients exhibit visual deficits, especially in the lower center fields, surgical removal should be considered even if the tumors are small and visual deficits are limited because improvement of both vision and daily activities can be achieved.
    Language English
    Publishing date 2024-02-14
    Publishing country Japan
    Document type Case Reports
    ISSN 2188-4226
    ISSN 2188-4226
    DOI 10.2176/jns-nmc.2023-0234
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: [How Do We Perform Imaging Tests before Treating Cerebral Aneurysms?]

    Koizumi, Satoshi / Nakatomi, Hirofumi

    No shinkei geka. Neurological surgery

    2021  Volume 49, Issue 1, Page(s) 16–23

    Abstract: Acquiring appropriate preoperative images is an important step in the treatment of cerebral aneurysms. Despite recent advances in contrast-enhanced CT and MRI, catheter angiography remains the standard of care in preoperative imaging tests for both ... ...

    Abstract Acquiring appropriate preoperative images is an important step in the treatment of cerebral aneurysms. Despite recent advances in contrast-enhanced CT and MRI, catheter angiography remains the standard of care in preoperative imaging tests for both ruptured and unruptured intracranial aneurysms. Three-dimensional rotational angiography can provide a clear view of vascular structure around the aneurysm in an intuitive manner, including the small perforators. For ruptured aneurysms, the treatment modality(i.e., surgical clipping or endovascular embolization)is usually based on emergent contrast CT and catheter angiography findings. For unruptured aneurysms, integrated assessment involving CT, MRI, and angiography is often useful in multimodal treatment decision making.
    MeSH term(s) Aneurysm, Ruptured/therapy ; Cerebral Angiography ; Embolization, Therapeutic ; Humans ; Intracranial Aneurysm/therapy ; Treatment Outcome
    Language Japanese
    Publishing date 2021-01-15
    Publishing country Japan
    Document type Journal Article
    ZDB-ID 197053-7
    ISSN 1882-1251 ; 0301-2603
    ISSN (online) 1882-1251
    ISSN 0301-2603
    DOI 10.11477/mf.1436204356
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: POLR2A Mutation is a Poor Prognostic Marker of Cerebellopontine Angle Meningioma.

    Okano, Atsushi / Miyawaki, Satoru / Teranishi, Yu / Hongo, Hiroki / Dofuku, Shogo / Ohara, Kenta / Sakai, Yu / Shin, Masahiro / Nakatomi, Hirofumi / Saito, Nobuhito

    Neurosurgery

    2024  

    Abstract: Background and objectives: Recent molecular analyses have shown that the driver genetic mutations of meningiomas were associated with the anatomic location. Among these, POLR2A mutation is common among lesions in the skull base, mainly in the ... ...

    Abstract Background and objectives: Recent molecular analyses have shown that the driver genetic mutations of meningiomas were associated with the anatomic location. Among these, POLR2A mutation is common among lesions in the skull base, mainly in the cerebellopontine angle (CPA). The objective of this study was to investigate the efficacy of POLR2A mutation as a prognostic marker for CPA meningiomas.
    Methods: We retrospectively analyzed the clinical data of 70 patients who had World Health Organization grade I CPA meningiomas. Somatic DNA was analyzed by Sanger sequencing and microsatellite array to examine for NF2, AKT1, KLF4, SMO, and POLR2A mutations and 22q loss. Genetic and clinical parameters were analyzed to identify the factors related with tumor recurrence.
    Results: We detected clearly the clinical features of the CPA cases with POLR2A mutation. Compared with cases without POLR2A mutation, cases with POLR2A mutation had more meningothelial type (P = 6.9 × 10-4), and higher rate of recurrence (P = .04). We found that the poor prognostic factors associated with the recurrence of CPA meningiomas were POLR2A mutation (P = .03, hazard ratio [HR] 9.38, 95% CI 1.26-70.0) and subtotal resection (STR) (P = 5.1 × 10-4, HR 63.1, 95% CI 6.09-655.0). In addition, in the group that underwent STR, POLR2A mutation was a poor prognostic factor associated with tumor recurrence (P = .03, HR 11.1, 95% CI 1.19-103.7).
    Conclusion: POLR2A mutation and STR were the poor prognostic markers associated with the recurrence of CPA meningioma. For CPA meningioma cases that underwent STR, only POLR2A mutation was a poor prognostic factor. Detecting POLR2A mutation may be a cost-effective, easy, and useful marker for prognostication.
    Language English
    Publishing date 2024-02-21
    Publishing country United States
    Document type Journal Article
    ZDB-ID 135446-2
    ISSN 1524-4040 ; 0148-396X
    ISSN (online) 1524-4040
    ISSN 0148-396X
    DOI 10.1227/neu.0000000000002873
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: [Surgical procedure in auditory brain stem implant].

    Nakatomi, Hirofumi

    Nihon Jibiinkoka Gakkai kaiho

    2012  Volume 114, Issue 11, Page(s) 851–854

    MeSH term(s) Cochlear Implantation/methods ; Cochlear Implants ; Electrodes, Implanted ; Humans ; Prognosis
    Language Japanese
    Publishing date 2012-01-17
    Publishing country Japan
    Document type Journal Article ; Review
    ZDB-ID 968067-6
    ISSN 0030-6622
    ISSN 0030-6622
    DOI 10.3950/jibiinkoka.114.851
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Indocyanine green illuminates the way to cut the tentorium in occipital transtentorial approach: technical note.

    Takami, Hirokazu / Tanaka, Shota / Takayanagi, Shunsaku / Nakatomi, Hirofumi / Saito, Nobuhito

    British journal of neurosurgery

    2021  Volume 37, Issue 6, Page(s) 1925–1927

    Abstract: Background and importance: The occipital transtentorial approach is used to address lesions at the posterior incisural space or upper cerebellum. This approach is rarely used, making standardization of the surgical procedure challenging. Here we ... ...

    Abstract Background and importance: The occipital transtentorial approach is used to address lesions at the posterior incisural space or upper cerebellum. This approach is rarely used, making standardization of the surgical procedure challenging. Here we describe the effectiveness of indocyanine green (ICG) and dye markings before tentorial incision in charting a safe and bloodless surgical trajectory for improved manoeuvrability.
    Clinical presentation: The first case was a 40-year-old man with a residual pineal mass after chemoradiation therapy for pathologically-proven germinoma. Surgical resection was performed via left occipital craniotomy. Incision of the left cerebellar tentorium by a radiofrequency knife was preceded by visualization of the straight sinus and venous lake, which were marked with dye, enabling safe entry into the quadrigeminal cistern. Finally, total-resection of the mature teratoma was achieved. The second case was a 50-year-old man with an enhancing mass at the cerebellar vermis and left hemisphere. Left occipital craniotomy was followed by ICG administration, illuminating the straight sinus and a complex structure of dural venous channels, which were marked with dye. This visualization maximized the tentorial incision by carefully avoiding venous structures and widely exposed the upper cerebellum. Subtotal-resection of the tumor was achieved, with a diagnosis of glioblastoma.
    Conclusion: ICG administration and dye marking are feasible and useful methods for precise identification/visualization of venous structures. They enable maximization as well as safe and appropriate tentorial incision to provide a sufficient surgical corridor for the occipital transtentorial approach.
    MeSH term(s) Male ; Humans ; Adult ; Middle Aged ; Neurosurgical Procedures/methods ; Indocyanine Green ; Dura Mater/surgery ; Craniotomy/methods ; Brain/surgery ; Surgical Wound/surgery
    Chemical Substances Indocyanine Green (IX6J1063HV)
    Language English
    Publishing date 2021-05-19
    Publishing country England
    Document type Case Reports ; Journal Article
    ZDB-ID 639029-8
    ISSN 1360-046X ; 0268-8697
    ISSN (online) 1360-046X
    ISSN 0268-8697
    DOI 10.1080/02688697.2021.1927982
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Progressive cerebral and coronary aneurysms in the original two patients with Kosaki overgrowth syndrome.

    Takenouchi, Toshiki / Kodo, Kazuki / Yamazaki, Fumito / Nakatomi, Hirofumi / Kosaki, Kenjiro

    American journal of medical genetics. Part A

    2020  Volume 185, Issue 3, Page(s) 999–1003

    Abstract: Skeletal overgrowth accompanied by de novo heterozygous activating mutations in PDGFRB (platelet-derived growth factor receptor beta), that is, p.Pro584Arg and p.Trp566Arg, defines Kosaki overgrowth syndrome (OMIM #616592). Emerging evidence suggests a ... ...

    Abstract Skeletal overgrowth accompanied by de novo heterozygous activating mutations in PDGFRB (platelet-derived growth factor receptor beta), that is, p.Pro584Arg and p.Trp566Arg, defines Kosaki overgrowth syndrome (OMIM #616592). Emerging evidence suggests a role of PDGFRB in the genesis of cerebral aneurysms. The delineation of the range and progression of the vascular phenotype of Kosaki overgrowth syndrome is urgently needed. Herein, we conducted subsequent analyses of serial neurovascular imaging studies of two original patients with a de novo heterozygous mutation in PDGFRB, that is, p.Pro584Arg. The analysis showed the progressive dilation of basilar and vertebral arteries and coronary arteries commencing during the teenage years and early 20s. The radiographic appearance of the basilar vertebral aneurysms showed signs of arterial wall dilation, compatible with the known vascular pathology of vascular-type Ehlers-Danlos syndrome and Loeys-Dietz syndrome. The dolichoectasia in cerebrovascular arteries can lead to fatal complications, even with neurosurgical interventions. To prevent the progression of artery dilation, preventative and therapeutic medical measures using tyrosine kinase inhibitors may be necessary in addition to optimal control of the systemic blood pressure. Kosaki overgrowth syndrome is a clinically recognizable syndrome that can exhibit progressive dilatory and tortuous vascular changes in basilar/vertebral and coronary arteries as early as in the teenage years. We recommend careful counseling regarding the risk of future vascular complications, optimal blood pressure control, and regular systemic vascular screening during follow-up examinations.
    MeSH term(s) Adolescent ; Age of Onset ; Amino Acid Substitution ; Aneurysm/genetics ; Blindness/etiology ; Bone Diseases, Developmental/genetics ; Calcinosis/etiology ; Carotid Artery Diseases/genetics ; Coronary Aneurysm/diagnostic imaging ; Coronary Aneurysm/genetics ; Disease Progression ; Female ; Gain of Function Mutation ; Hearing Loss, Unilateral/etiology ; Humans ; Intracranial Aneurysm/diagnostic imaging ; Intracranial Aneurysm/genetics ; Mutation, Missense ; Point Mutation ; Receptor, Platelet-Derived Growth Factor beta/genetics ; Receptor, Platelet-Derived Growth Factor beta/physiology ; Syndrome ; Vertebrobasilar Insufficiency/diagnostic imaging ; Vertebrobasilar Insufficiency/genetics
    Chemical Substances PDGFRB protein, human (EC 2.7.10.1) ; Receptor, Platelet-Derived Growth Factor beta (EC 2.7.10.1)
    Language English
    Publishing date 2020-12-31
    Publishing country United States
    Document type Case Reports ; Journal Article
    ZDB-ID 2108614-X
    ISSN 1552-4833 ; 0148-7299 ; 1552-4825
    ISSN (online) 1552-4833
    ISSN 0148-7299 ; 1552-4825
    DOI 10.1002/ajmg.a.62027
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Musical Auditory Alpha Wave Neurofeedback: Validation and Cognitive Perspectives.

    Takabatake, Kazuhiko / Kunii, Naoto / Nakatomi, Hirofumi / Shimada, Seijiro / Yanai, Kei / Takasago, Megumi / Saito, Nobuhito

    Applied psychophysiology and biofeedback

    2021  Volume 46, Issue 4, Page(s) 323–334

    Abstract: Neurofeedback through visual, auditory, or tactile sensations improves cognitive functions and alters the activities of daily living. However, some people, such as children and the elderly, have difficulty concentrating on neurofeedback for a long time. ... ...

    Abstract Neurofeedback through visual, auditory, or tactile sensations improves cognitive functions and alters the activities of daily living. However, some people, such as children and the elderly, have difficulty concentrating on neurofeedback for a long time. Constant stressless neurofeedback for a long time may be achieved with auditory neurofeedback using music. The primary purpose of this study was to clarify whether music-based auditory neurofeedback increases the power of the alpha wave in healthy subjects. During neurofeedback, white noise was superimposed on classical music, with the noise level inversely correlating with normalized alpha wave power. This was a single-blind, randomized control crossover trial in which 10 healthy subjects underwent, in an assigned order, normal and random feedback (NF and RF), either of which was at least 4 weeks long. Cognitive functions were evaluated before, between, and after each neurofeedback period. The secondary purpose was to assess neurofeedback-induced changes in cognitive functions. A crossover analysis showed that normalized alpha-power was significantly higher in NF than in RF; therefore, music-based auditory neurofeedback facilitated alpha wave induction. A composite category-based analysis of cognitive functions revealed greater improvements in short-term memory in subjects whose alpha-power increased in response to NF. The present study employed a long period of auditory alpha neurofeedback and achieved successful alpha wave induction and subsequent improvements in cognitive functions. Although this was a pilot study that validated a music-based alpha neurofeedback system for healthy subjects, the results obtained are encouraging for those with difficulty in concentrating on conventional alpha neurofeedback.Trial registration: 2018077NI, date of registration: 2018/11/27.
    MeSH term(s) Activities of Daily Living ; Aged ; Child ; Cognition/physiology ; Electroencephalography/methods ; Humans ; Music ; Neurofeedback/methods ; Pilot Projects ; Single-Blind Method
    Language English
    Publishing date 2021-04-30
    Publishing country Germany
    Document type Journal Article ; Randomized Controlled Trial ; Research Support, Non-U.S. Gov't
    ZDB-ID 1390949-6
    ISSN 1573-3270 ; 1090-0586
    ISSN (online) 1573-3270
    ISSN 1090-0586
    DOI 10.1007/s10484-021-09507-1
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Treatment of ischemic neuronal death by introducing brain-derived neurotrophic factor mRNA using polyplex nanomicelle.

    Fukushima, Yuta / Uchida, Satoshi / Imai, Hideaki / Nakatomi, Hirofumi / Kataoka, Kazunori / Saito, Nobuhito / Itaka, Keiji

    Biomaterials

    2021  Volume 270, Page(s) 120681

    Abstract: Ischemic neuronal death causes serious lifelong neurological deficits; however, there is no proven effective treatment that can prevent neuronal death after the ischemia. We investigated the feasibility of mRNA therapeutics for preventing the neuronal ... ...

    Abstract Ischemic neuronal death causes serious lifelong neurological deficits; however, there is no proven effective treatment that can prevent neuronal death after the ischemia. We investigated the feasibility of mRNA therapeutics for preventing the neuronal death in a rat model of transient global ischemia (TGI). By intraventricular administration of mRNA encoding brain-derived neurotrophic factor (BDNF) using a polymer-based carrier, polyplex nanomicelle, the mRNA significantly increased the survival rate of hippocampal neurons after TGI, with a rapid rise of BDNF in the hippocampus. Interestingly, mRNA administration on Day 2 after TGI provided significantly better survival rate than the administration immediately after TGI. Eventually, dosing twice on Day 2 and 5 exerted long-term therapeutic effects, which were confirmed by a Y-maze behavioral test demonstrating improved spatial memory compared with untreated rats on Day 20. Immunohistochemical analysis showed that astrocytes were chief targets of the BDNF mRNA-loaded nanomicelles, suggesting that the augmented BDNF secretion from astrocytes creates a supportive microenvironment for the neurons to tolerate changes caused by ischemic stresses, and terminate the process of progressive neuronal death after the ischemic attack. Overall, the unique mechanism of action of mRNA therapeutics provide a promising approach for preventing ischemic neuronal death.
    MeSH term(s) Animals ; Brain-Derived Neurotrophic Factor/genetics ; Cell Death ; Hippocampus/metabolism ; Ischemia/therapy ; RNA, Messenger/genetics ; Rats
    Chemical Substances Brain-Derived Neurotrophic Factor ; RNA, Messenger
    Language English
    Publishing date 2021-01-21
    Publishing country Netherlands
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 603079-8
    ISSN 1878-5905 ; 0142-9612
    ISSN (online) 1878-5905
    ISSN 0142-9612
    DOI 10.1016/j.biomaterials.2021.120681
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