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Cerebellopontine angle

Gopalakrishnan M Sasidharan
Epidermoid cysts are notorious for their propensity to sneak into deep recesses between cranial nerves in the posterior fossa. Attempts to achieve complete excision using ordinary instruments when tempted by the seeming ease of dissection is known to cause unacceptable deficits. The Xomed monopolar stimulator electrode probe of the nerve integrity electromyography monitor has several advantages when used as the primary dissection tool for deep-seated epidermoid cysts. Cerebellopontine angle epidermoid is the classical prototype of a strategically placed deep-seated epidermoid tumor...
January 12, 2018: Curēus
D Mata-Mbemba, M Zapotocky, S Laughlin, M D Taylor, V Ramaswamy, C Raybaud
BACKGROUND AND PURPOSE: Molecular grouping of medulloblastoma correlates with prognosis and supports the therapeutic strategy. We provide our experience with the imaging features of primary and metastatic disease in relation to the molecular groups. MATERIALS AND METHODS: One hundred nineteen consecutive patients (mean age, 7.3 ± 3.8 years at diagnosis; male, 79 [66.4%]) with a confirmed diagnosis of medulloblastoma and interpretable pretreatment MRIs were retrieved from our data base from January 2000 to December 2016...
March 15, 2018: AJNR. American Journal of Neuroradiology
M A Akulov, O R Orlova, T V Tabashnikova, V V Karnaukhov, A S Orlova
Surgical treatment of posterior cranial fossa and cerebellopontine angle tumors is associated with a risk of facial nerve dysfunction. The causes for facial muscle paresis include nerve compression by the tumor, destruction of the nerve structure by the tumor growing from nerve fibers, nerve injury during surgical removal of the tumor, etc. The first 3 months after facial nerve injury are a potential therapeutic window for the use of botulinum toxin type A (BTA). During this period, the drug is introduced both in the healthy side to improve the facial symmetry at rest and during mimetic movements and in the affected side to induce drug-induced ptosis...
2018: Zhurnal Voprosy Neĭrokhirurgii Imeni N. N. Burdenko
Xiaobing Jiang, Yinsheng Chen, Zhihuan Zhou, Liping Luo, Wanming Hu, Huirong Zheng, Zhe Zhu, Jian Wang, Zhongping Chen
BACKGROUND: The pineal gland has been demonstrated to be involved in the development of mood and psychotic disorders. However, few studies have looked at the relationship between pineal region tumors and psychiatric disorders. Intracranial epidermoid cysts usually arise in cerebellopontine angle area, and are extremely rare in the pineal region. The case of pineal epidermoid cyst presenting as schizophrenia has never been reported before. CASE PRESENTATION: We described the case of a 23-year old man who presented to hospital with symptoms suggestive of schizophrenia...
March 7, 2018: World Neurosurgery
Paul A Lambert, Benjamin T Crane
No abstract text is available yet for this article.
March 1, 2018: Otology & Neurotology
C W Huo, C Caputo, Y Y Wang
Background: Keratinous or epidermoid cysts (ECs) are encapsulated lesions lined by squamous cell epithelium. They comprise approximately 1% of intracranial lesions. Contrary to dermoid cysts, they lack dermal elements such as sebaceous or apocrine glands and hair follicles. The sellar region is the second most common intracranial site following the cerebellopontine angle. Here, we report a case of EC in a patient who complained of endocrine disturbances. We also performed a systematic review on previously published cases to analyze clinical and radiological characteristics and report the treatment outcomes of suprasellar ECs...
2018: Surgical Neurology International
Shawn M Stevens, Joseph T Breen, Vincent DiNapoli
No abstract text is available yet for this article.
February 28, 2018: Otology & Neurotology
Yuichi Mochizuki, Tomonori Kobayashi, Akitsugu Kawashima, Takayuki Funatsu, Takakazu Kawamata
Background: Chronic subdural hematoma (CSDH) of the posterior fossa is uncommon in adults. Only a few cases have been reported, and most of these were secondary to head injury or anticoagulant therapy. We herein describe a case of successful surgical treatment of CSDH in the posterior fossa after surgical removal of a large supratentorial and infratentorial dermoid cyst. Case Description: A 71-year-old woman underwent removal of a left supratentorial and infratentorial dermoid cyst via a left transzygomatic approach...
2018: Surgical Neurology International
Rajasekharan Rajeev, Kamble Jayaprakash Harsha, Jain George Panattil
No abstract text is available yet for this article.
January 2018: Asian Journal of Neurosurgery
Tamer Altay, Cem Akkurt
Epidermoid tumors are rare benign neoplasms. They commonly occur in the parasellar region and the cerebellopontine angle but may sometimes present in the so-called petroclival region, or beyond the boundaries of this location. For those that are localized in multiple compartments, staged surgeries, extensive transtemporal approaches, or somewhat limited extended middle fossa approach are generally performed. Although a good resection can be achieved by these approaches, they carry relatively high morbidity and mortality...
January 2018: Asian Journal of Neurosurgery
Khursheed Ahmad Ansari, Girish Menon, Suresh Nair, Mathew Abraham
Aneurysms arising from anterior inferior cerebellar artery-posterior inferior cerebellar artery (AICA-PICA) variant are extremely rare. They usually present with subarachnoid hemorrhage. This is probably the second case report of a large thrombosed AICA-PICA variant aneurysm presenting as a cerebellopontine angle mass lesion with cranial nerve palsy, managed successfully by surgical clipping.
January 2018: Asian Journal of Neurosurgery
Vadim Gospodarev, Vikram Chakravarthy, Casey Harms, Hannah Myers, Brett Kaplan, Esther Kim, Matthew Pond, Kenneth De Los Reyes
BACKGROUND: Trigeminal neuralgia (TGN) causes severe unilateral facial pain. The etiology is hypothesized to be segmental demyelination of the trigeminal nerve root via compression by the superior cerebellar artery (SCA). Microvascular decompression (MVD) allows immediate and long-term pain relief. Preoperative evaluation includes MRI (magnetic resonance imaging) and/or MRA (magnetic resonance angiography) of the brain. Having a pacemaker is a contraindication for MRI. There have been isolated reports of using computed tomography (CT) cisternography scans for radiation planning for TGN...
February 21, 2018: World Neurosurgery
Shujing Yao, Jiashu Zhang, Yining Zhao, Yuanzheng Hou, Xinghua Xu, Zhizhong Zhang, Ron Kikinis, Xiaolei Chen
OBJECTIVE: To address the feasibility and predictive value of multimodal image-based virtual reality in detecting and assessing features of neurovascular confliction (NVC), particularly regarding the detection of offending vessels, degree of compression exerted on the nerve root, in patients who underwent microvascular decompression (MVD) for non-lesional trigeminal neuralgia (TN) and hemi-facial spasm (HFS). METHODS: This prospective study includes 42 consecutive patients who underwent MVD for classic primary TN or HFS...
February 21, 2018: World Neurosurgery
Satyashiva Munjal, Amit Srivastava, Sunila Jain, V S Mehta
No abstract text is available yet for this article.
January 2018: Journal of Neurosciences in Rural Practice
Ma Kai, Li Yongjie
BACKGROUND: It is difficult to differentiate patients with cerebellopontine angle (CPA) cholesteatoma and patients with primary trigeminal neuralgia(TN) just according to early symptoms. We aimed to explore the clinical characteristics, early diagnosis and microneurosurgical techniques for CPA cholesteatoma presented as trigeminal neuralgia. METHODS: The data of 26 patients who complained trigeminal neuralgia with cerebellopontine angle cholesteatoma between January 2009 and December 2015 were collected and studied retrospectively, they were diagnosed by MRI preoperatively and confirmed by pathology postoperatively...
February 15, 2018: World Neurosurgery
Yingchao Zhao, Pinan Liu, Na Zhang, Jie Chen, Lukas D Landegger, Limeng Wu, Fu Zhao, Yanxia Zhao, Yanling Zhang, Jing Zhang, Takeshi Fujita, Anat Stemmer-Rachamimov, Gino B Ferraro, Hao Liu, Alona Muzikansky, Scott R Plotkin, Konstantina M Stankovic, Rakesh K Jain, Lei Xu
Neurofibromatosis type II (NF2) is a disease that needs new solutions. Vestibular schwannoma (VS) growth causes progressive hearing loss, and the standard treatment, including surgery and radiotherapy, can further damage the nerve. There is an urgent need to identify an adjunct therapy that, by enhancing the efficacy of radiation, can help lower the radiation dose and preserve hearing. The mechanisms underlying deafness in NF2 are still unclear. One of the major limitations in studying tumor-induced hearing loss is the lack of mouse models that allow hearing testing...
February 9, 2018: Proceedings of the National Academy of Sciences of the United States of America
Aya Imafuku, Kiho Tanaka, Yuji Marui, Yoshifumi Ubara, Kenmei Takaichi, Shinji Tomikawa, Yasunori Ota, Takeshi Fujii, Yasuo Ishii
Although primary central nervous system post-transplant lymphoproliferative disorder (PCNS-PTLD) causes various symptoms depending on the tumor region, there has been no previous report of PCNS-PTLD in the cerebellopontine angle that was diagnosed due to peripheral facial nerve palsy. We herein report a case involving a 62-year-old man with PCNS-PTLD in the cerebellopontine angle who was diagnosed due to peripheral facial nerve palsy. The reduction of immunosuppressive therapy, whole-brain radiotherapy, intrathecal chemotherapy, and rituximab were effective in treating this patient...
February 9, 2018: Internal Medicine
James A Balogun, Nurudeen A Adeleke, Ayodeji O Salami, Timothy O Odebode
INTRODUCTION: Epidermoid tumors are rare benign slow growing congenital tumours, most frequently located in the cerebellopontine angle of the intracranial cavity. They usually assume large sizes before patients become symptomatic. Though amenable to surgery, their adherence to neurovascular structures poses a surgical challenge that results in subtotal resection thus increasing the risk of recurrence. CASE DESCRIPTION: We report two adult patients whose imaging studies revealed epidermoid tumors located in the cerebellar vermis; an uncommon site for such tumors...
January 30, 2018: World Neurosurgery
Brandon D Liebelt, Meng Huang, Gavin W Britz
OBJECTIVE: The retrosigmoid approach is broadly applicable to many procedures in the posterior fossa. However, cerebellar retraction is often necessary for lesions in the cerebellopontine (CP) angle which can lead to complications. An extended retrosigmoid approach skeletonizes the sigmoid sinus and allows a wider corridor with less retraction. This study aimed to investigate the differences in retraction pressure between the retrosigmoid and extended retrosigmoid approach in a cadaver model...
February 2, 2018: World Neurosurgery
Daniele Marchioni, Marco Carner, Davide Soloperto, Luca Bianconi, Andrea Sacchetto, Luca Sacchetto, Barbara Masotto, Livio Presutti
Objective Vestibular schwannoma (VS) is a benign tumor of the lateral skull base. Different microscopic surgical techniques are described in literature: the retrosigmoid and translabyrinthine approaches are used to treat big tumors located in the cerebellopontine angle, and the middle cranial fossa approach is utilized for small tumors with good hearing preservation. The expanded transcanal transpromontorial (ExpTT) approach is a combined microscopic-endoscopic technique previously indicated for Koos stage I and II VS and now proposed for larger VS, up to 3 cm in diameter, with linear progression into the cerebellopontine angle and touching the brainstem...
February 1, 2018: Otolaryngology—Head and Neck Surgery
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