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Acoustic schwannoma

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https://www.readbyqxmd.com/read/28047111/su-f-t-611-critical-analysis-and-efficacy-of-linac-based-beam-modulator-and-cyberknife-treatment-plans-for-acoustic-neuroma-schwannoma
#1
Karrthick Kp, T Kataria, R Thiyagarajan, T Selvan, A Abhishek
PURPOSE: To study the critical analysis and efficacy of Linac and Cyberknife (CK) treatment plans for acoustic neuroma/schwannoma. METHODS: Twelve of acoustic neuroma/schwannoma patients were taken for these study that. Treatment plans were generated in Multiplan treatment planning system (TPS) for CK using 5,7.5 and 10mm diameter collimators. Target volumes were in the range of 0.280 cc to 9.256 cc. Prescription dose (Rx) ranges from 1150cGy to 1950cGy delivered over 1 to 3 Fractions...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046895/su-f-t-648-sharpening-dose-fall-off-via-beam-number-enhancements-for-stereotactic-brain-radiosurgery
#2
J Chiu, M Pierce, S Braunstein, M McDermott, P Sneed, L Ma
PURPOSE: Sharp dose fall-off is the hallmark of brain radiosurgery to deliver a high dose of radiation to the target while minimizing dose to normal brain tissue. In this study, we developed a technique for the purpose of enhancing the peripheral dose gradient by magnifying the total number of beams focused toward each isocenter via patient head tilt and simultaneous beam intensity modulations. METHODS: Computer scripting for the proposed beam number enhancement (BNE) technique was developed...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28017747/complications-and-their-managements-of-large-intracranial-vestibular-schwannoma-via-retrosigmoid-approach
#3
Xiang Huang, Ming Xu, Jian Xu, Liangfu Zhou, Ping Zhong, Mingyu Chen, Kaiyuan Ji, Huiyu Chen, Ying Mao
OBJECTIVE: To investigate the common complications from the microsurgical treatment of large intracranial vestibular schwannoma (VS) via suboccipital retrosigmoid approach and to propose strategies for minimizing such complications. METHODS: We selected all large unilateral VS patients from the collected database (1999-2013) who underwent microsurgical resection as their initial treatment for histopathologically confirmed VS. Tumors larger than 30 x 20 mm were defined as large...
December 22, 2016: World Neurosurgery
https://www.readbyqxmd.com/read/27958212/association-of-bilateral-multiple-presumed-retinal-astrocytic-proliferations-with-combined-hamartoma-of-retina-and-retinal-pigment-epithelium-in-a-9-year-old-male-child-with-neurofibromatosis-type-2
#4
Pukhraj Rishi, Raj Shri Hirawat, Aditya Verma
Neurofibromatosis type 2 (NF-2) is characterized by multifocal proliferation of neural crest-derived cells. The characteristics finding of NF-2 is bilateral vestibular schwannomas. Combined hamartoma of retina and retinal epithelium (CHRRPE) is another associated finding. A 9 year-old-male child presented with left eye decreased vision for 3 months. Visual acuity was 0.0 and 0.8 LogMAR in the right and left eye, respectively. Left fundus showed an elevated, pigmented lesion with surface wrinkling and vascular tortuosity suggestive of CHRRPE with multiple presumed retinal astrocytic proliferations in mid-periphery...
November 2016: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/27921114/-postoperative-imaging-of-the-internal-auditory-canal-visualization-of-active-auditory-implants-german-version
#5
I Todt, G Rademacher, P Mittmann, S Mutze, A Ernst
BACKGROUND: Assessment of the internal auditory canal (IAC) and the cochlea is of central importance in neurotology. The artefacts and visibility of the different types of active auditory implants in MRI vary, due to their specific ferromagnetic components. Knowledge of the size of MRI artefacts and the options for handling these is important for the auditory rehabilitation of specific diseases (e. g., vestibular schwannoma). METHODS: The current paper is a literature review RESULTS: MRI assessment of the IAC and cochlea after surgical placement of an active auditory implant is feasible only with a percutaneous bone-anchored hearing aid (BAHA, Ponto)...
December 5, 2016: HNO
https://www.readbyqxmd.com/read/27858100/-early-acoustic-evoked-potentials-in-patients-with-small-vestibular-schwannomas
#6
I Baljić, E Börner-Lünser, D Eßer, O Guntinas-Lichius
BACKGROUND: The prognostic potential of click-evoked early acoustic evoked potentials (EAEP) for vestibular schwannoma (VS) diagnostics is considered insufficient for tumors small than approximately <1.5 cm in diameter. However, up until now, the derivations at higher sound pressure levels have mainly been used for EAEP evaluation. The aim of this study was to examine whether registered EAEP are more sensitive to pathological changes at low sound pressure levels and with smaller tumors...
November 17, 2016: HNO
https://www.readbyqxmd.com/read/27815992/contralateral-hearing-loss-and-facial-palsy-in-an-operated-case-of-vestibular-schwannoma-case-report
#7
Abhijit Warade, Pawan Chawla, Anshu Warade, Ketan Desai
INTRODUCTION: Contralateral ear hearing loss (CHL) is an extremely rare but a potentially devastating complication in a patient with already compromised hearing due to a Vestibular schwannoma (VS). Our patient had CHL accompanied by contralateral facial palsy. Our case is only the second case reported in literature to the best of our knowledge. PRESENTATION OF CASE: A 55-year elderly male presented with right sided sensorineural hearing loss, cerebellar signs and Grade II House & Brackmann (H&B) facial nerve weakness for last1-year...
2016: International Journal of Surgery Case Reports
https://www.readbyqxmd.com/read/27755456/diagnostic-criteria-for-detection-of-vestibular-schwannomas-in-the-va-population
#8
Israel Pena, Erin Y Chew, Barcleigh P Landau, Joseph T Breen, Jose P Zevallos, Jeffrey T Vrabec
OBJECTIVE: To investigate the prevalence of vestibular schwannoma (VS) and asymmetric sensorineural hearing loss in the Veterans Administration hospital population and analyze a more efficient method of diagnosing VS in a population with significant noise exposure. STUDY DESIGN: Retrospective review of South Central (VISN 16) Veterans Administration hospitals. METHODS: Record query for ICD-9 codes for asymmetric sensorineural hearing loss or VS between 1999 and 2012...
December 2016: Otology & Neurotology
https://www.readbyqxmd.com/read/27738538/neurofibromatosis-type-2-presenting-with-oculomotor-ophthalmoplegia-and-distal-myopathy
#9
Jessica Mani Penny Tevaraj, Evelyn Tai Li Min, Raja Azmi Mohd Noor, Azhany Yaakub, Wan Hazabbah Wan Hitam
Neurofibromatosis type 2 usually presents with bilateral acoustic schwannomas. We highlight the rare presentation of neurofibromatosis initially involving third nerve. A 23-year-old Malay female presented with left eye drooping of the upper lid and limitation of upward movement for 8 years. It was associated with right-sided body weakness, change in voice, and hearing disturbance in the right ear for the past 2 years. On examination, there was mild ptosis and limitation of movement superiorly in the left eye...
2016: Case Reports in Ophthalmological Medicine
https://www.readbyqxmd.com/read/27675473/inherent-functional-dependence-among-cochlear-dose-surrogates-for-stereotactic-radiosurgery-of-acoustic-schwannomas
#10
L Ma, S E Braunstein, P Theodosopoulos, M W McDermott, P K Sneed
No abstract text is available yet for this article.
October 1, 2016: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/27593888/simultaneous-translabyrinthine-tumor-removal-and-cochlear-implantation-in-vestibular-schwannoma-patients
#11
Jin Won Kim, Ji Hyuk Han, Jin Woong Kim, In Seok Moon
Refinement of surgical techniques has allowed hearing preservation after tumor resection to be prioritized. Moreover, restoration of hearing after tumor removal can be attempted in patients with bilateral vestibular schwannomas or those with a schwannoma in the only-hearing ear. Cochlear implantation (CI) has emerged as a proper method of acoustic rehabilitation, provided that the cochlear nerve remains intact. Studies of electrical promontory stimulation in patients after vestibular schwannoma resection have demonstrated favorable results...
November 2016: Yonsei Medical Journal
https://www.readbyqxmd.com/read/27593791/unilateral-acoustic-neuromas-in-childhood-without-evidence-of-neurofibromatosis-experience-in-10-patients-at-a-single-institute
#12
Luxin Yin, Zhenyu Ma, Chunde Li, Shiqi Luo
AIM: We investigated the clinical presentation and management issues of unilateral vestibular schwannomas in childhood without evidence of neurofibromatosis. MATERIAL AND METHODS: Ten pediatric patients with unilateral vestibular schwannomas and no evidence of neurofibromatosis were treated by the senior author at Tiantan Hospital from January 1994 to December 2014. The clinical manifestations, neuroimaging findings, treatment methods, and therapeutic results were retrospectively reviewed...
December 28, 2015: Turkish Neurosurgery
https://www.readbyqxmd.com/read/27565388/the-fully-endoscopic-acoustic-neuroma-surgery
#13
REVIEW
Daniele Marchioni, Marco Carner, Alessia Rubini, João Flávio Nogueira, Barbara Masotto, Matteo Alicandri-Ciufelli, Livio Presutti
Surgical approaches to vestibular schwannomas (VS) are widely known and extensively recorded. For the first time, an exclusive endoscopic approach to the internal acoustic canal (IAC) was described and used to safely remove a cochlear schwannoma involving IAC in March 2012. The aim of this article was to summarize indications and technique to treat intracanalicular VS by transcanal/transpromontorial endoscopic approach. Because management of intracanalicular VSs is complex and strongly debated, this kind of therapeutic option in the appropriate and selected cases could modify classic concepts of the management of this pathology...
October 2016: Otolaryngologic Clinics of North America
https://www.readbyqxmd.com/read/27526562/-hypofractionated-radiosurgery-for-benign-brain-lesions-the-best-of-all-worlds
#14
REVIEW
Or Cohen-Inbar
Despite advances in neurosurgical technique, postoperative morbidity continues to taint open complete removal of many benign cranial base tumors (meningioma, pituitary adenomas, schwannomas). The incidence of temporary and permanent cranial nerve deficits is reported to be as high as 44% and 56% respectively, with postoperative mortality rates as high as 9%. As a consequence, many neurosurgeons choose to perform partial resections in order to preserve neurological functions. Progression rates after partial removal of a meningioma with no radiosurgery have been reported to be as high as 70%, compared to > 90% post-radiosurgical progression free survival rates...
May 2016: Harefuah
https://www.readbyqxmd.com/read/27453796/the-outermost-dura-like-membrane-of-vestibular-schwannoma
#15
Ryosuke Tomio, Kazunari Yoshida, Maya Kohno, Dai Kamamoto, Shuji Mikami
BACKGROUND: The membranous structure of vestibular schwannoma is an important factor in its surgical treatment. Herein, we report intraoperative and microscopic findings relating to an outermost dura-like membrane in cases of vestibular schwannoma and the importance of these findings. METHODS: Intraoperative findings of 16 cases of vestibular schwannoma treated with an initial surgery were studied with an aim to determine if the cases had a dura-like membrane. Then we studied microscopic findings of the dura-like membrane using hematoxylin and eosin, Masson trichrome, and immunohistochemical staining in 2 cases...
2016: Surgical Neurology International
https://www.readbyqxmd.com/read/27384363/schwannoma-extending-from-the-umbilical-region-to-the-mid-thigh-compressing-the-major-vessels-of-the-right-leg-a-case-report-and-review-of-the-literature
#16
Joseph Yorke, Babatunde M Duduyemi, Abiboye C Yifieyeh, P K S Fiifi-Yankson, Collins Appiah, Dorcas Afful-Yorke, Michael O Adinku, D Ahulu
Schwannomas are benign, usually encapsulated, nerve sheath tumours derived from Schwann cells. They commonly arise from the cranial nerves as acoustic schwannomas and are extremely rare in the pelvis and retroperitoneal area (<0.5% of reported cases) unless they are combined with Von Recklinghausen disease (type 1 neurofibromatosis). We report the case of a 23-year-old woman with a mass extending from the umbilical region in the abdomen to the upper two-thirds of the thigh. As this tumour is so rare, and in order to ensure optimal treatment and survival for our patient, a computed tomography-guided biopsy was performed before en bloc tumour excision...
July 2016: South African Medical Journal, Suid-Afrikaanse Tydskrif Vir Geneeskunde
https://www.readbyqxmd.com/read/27366252/morphometric-analysis-of-posterior-fossa-in-indian-cp-angle-acoustic-schwannoma-patients
#17
Mohana Rao Patibandla, Manas K Panigrahi, Paniraj L Gurram, Amit Kumar Thotakura, Dilip Kulkarni
AIM: To study the morphometry of posterior fossa in Indian CP angle schwannoma patients in order to know its influence on the extent of excision of the CP angle acoustic schwannomas. MATERIALS AND METHODS: One hundred cases of cerebellopontine angle schwannomas treated surgically by the senior author and 20 controls between January 2006 and June 2011 were consecutively investigated with computed tomography (CT) using the high-resolution CT bone windows before surgery...
July 2016: Asian Journal of Neurosurgery
https://www.readbyqxmd.com/read/27345891/-the-management-evolution-for-vestibular-schwannoma-history-and-current-situation
#18
REVIEW
L Y Hu, Z Y Wang, Q Q Hua
It has been over 200 years since the acoustic neuroma(AN) was firstly reported. From simply describing its symptoms to the decline of surgical mortality, the protection of facial and acoustic nerve function, as well as the improvement of the patients' quality of life. Physicians made efforts on evolving the diagnostic techniques and treatment strategies, and a better understanding of AN's development. The current major managements of AN are microsurgery, stereotactic radiosurgery, and follow-up. We reviewed the AN's history and prospected its future managements...
June 7, 2016: Zhonghua Er Bi Yan Hou Tou Jing Wai Ke za Zhi, Chinese Journal of Otorhinolaryngology Head and Neck Surgery
https://www.readbyqxmd.com/read/27330427/radiotherapy-for-vestibular-schwannoma-review-of-recent-literature-results
#19
Giuseppina Apicella, Marina Paolini, Letizia Deantonio, Laura Masini, Marco Krengli
BACKGROUND: The management of vestibular schwannoma is still a quite controversial issue and can include wait and see policy, surgery and radiotherapy, mainly with stereotactic technique. The purpose of this study is to review the results of recent clinical series treated by radiotherapy. MATERIALS AND METHODS: Literature search was performed by Pubmed and Scopus by using the words "vestibular schwannoma, acoustic neuroma, radiotherapy, radiosurgery". RESULTS: Management options of VS include wait and see, surgery and radiotherapy...
July 2016: Reports of Practical Oncology and Radiotherapy
https://www.readbyqxmd.com/read/27305754/-the-multidisciplinary-treatment-of-vestibular-schwannoma-acoustic-neuroma
#20
REVIEW
Or Cohen-Inbar
UNLABELLED: GENERAL: Treatment of vestibular schwannoma (VS) via microsurgery, radiosurgery (SRS), or fractionated radiotherapy (FRT), is advocated for symptomatic patients or those with rapid tumor growth, despite older age and comorbidities. VS growth rate >2.5 mm/year is associated with lower hearing preservation rates. Regardless of growth rate, conservative management is associated with a progressive hearing loss, ranging 2.77-5.39 dB/year. MICROSURGERY: The retrosigmoid approach is associated with higher hearing preservation and facial nerve function rates for VS >1...
March 2016: Harefuah
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