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Acoustic neuroma

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https://www.readbyqxmd.com/read/28048547/we-ab-209-06-dynamic-collimator-trajectory-algorithm-for-use-in-vmat-treatment-deliveries
#1
L MacDonald, C Thomas, A Syme
PURPOSE: To develop advanced dynamic collimator positioning algorithms for optimal beam's-eye-view (BEV) fitting of targets in VMAT procedures, including multiple metastases stereotactic radiosurgery procedures. METHODS: A trajectory algorithm was developed, which can dynamically modify the angle of the collimator as a function of VMAT control point to provide optimized collimation of target volume(s). Central to this algorithm is a concept denoted "whitespace", defined as area within the jaw-defined BEV field, outside of the PTV, and not shielded by the MLC when fit to the PTV...
June 2016: Medical Physics
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
#2
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/28046447/su-f-t-612-investigation-of-acoustic-neuroma-planning-for-stereotactic-radiosurgery-utilizing-linac-based-cone-collimators
#3
C Yeboah, M Ruschin, Y Lee, A Sarfehnia, B Chugh, S Myrehaug, M Tsao, H Soliman, A Sahgal
PURPOSE: To assess the feasibility of designing clinically-acceptable stereotactic radiosurgery (SRS) plans utilizing linac-based cone collimators for patients presenting with acoustic neuroma. METHODS: Five acoustic neuroma patients with gross tumour volumes (GTVs) of sizes from 1.3 to 2.7 cc were studied. The cranial-caudal extent of the GTVs range from 1.1 to 1.7 cm whereas the largest cross-sectional extent of the lesions varied from 2.0 to 2.4 cm. No PTV margin was added...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28044324/overlap-guided-fixed-patient-support-positioning-optimization-for-cranial-srt
#4
R Lee MacDonald, James L Robar, Christopher G Thomas
PURPOSE: To investigate potential dosimetric improvements through the optimization of fixed-couch rotational position in cranial cancer stereotactic treatments. METHODS: Using previously delivered cranial stereotactic radiotherapy plans treated at the Nova Scotia Health Authority (NSHA), we have redesigned the treatment arrangement to find the optimal couch rotation positions based on the reduction of overlap between organs-at-risk of exposure (OARs) and target volume (PTV)...
January 2017: Medical Physics
https://www.readbyqxmd.com/read/28005807/suspected-acoustic-neuroma-demyelinating-lesions
#5
Xiuming Zhou, Xiang Wang, Xiejun Zhang, Qiang Wu, Guodong Huang, Weiping Li
Demyelinating lesions were recognized as a kind of rare central nervous system demyelinating lesion. The diagnosis and differential diagnosis of demyelinating lesions is difficult. Once the diagnosis was delayed or incorrect, it will make a great impact on patients.Demyelinating lesions often involved in young and middle-aged, but this patient was the aged, which is rare.
November 2016: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/27991438/limitations-of-analytical-dose-calculations-for-small-field-proton-radiosurgery
#6
Changran Geng, Juliane Daartz, Kimberley Lam-Tin-Cheung, Marc Bussiere, Helen A Shih, Harald Paganetti, Jan Schuemann
The purpose of the work was to evaluate the dosimetric uncertainties of an analytical dose calculation engine and the impact on treatment plans using small fields in intracranial proton stereotactic radiosurgery (PSRS) for a gantry based double scattering system. 50 patients were evaluated including 10 patients for each of 5 diagnostic indications of: arteriovenous malformation (AVM), acoustic neuroma (AN), meningioma (MGM), metastasis (METS), and pituitary adenoma (PIT). Treatment plans followed standard prescription and optimization procedures for PSRS...
January 7, 2017: Physics in Medicine and Biology
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
#7
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/27935543/acoustic-neuroma-as-first-sign-of-inner-ear-functional-disorders
#8
Marzena Bielińska, Kalina Owczarek, Joanna Nowosielska-Grygiel, Jurek Olszewski, Piotr Pietkiewicz
INTRODUCTION: The aim of this work was to describe acoustic neuromas as the first signs of inner ear functional disorders. MATERIAL AND METHODS: The study covered 3,456 audiological and otoneurological patients, who were treated in the Department of Otolaryngology, Laryngological Oncology, Audiology and Phoniatrics Military Medical Academy University Teaching Hospital in Lodz within the period of 2011-2016. Among the studied subjects, an acoustic neuroma on the vestibulocochlear nerve was diagnosed in 13 cases (5,16%), including 9 women and 4 men...
October 31, 2016: Otolaryngologia Polska. the Polish Otolaryngology
https://www.readbyqxmd.com/read/27930442/multifactor-influences-of-shared-decision-making-in-acoustic-neuroma-treatment
#9
Jason C Nellis, Jeff D Sharon, Seth E Pross, Lisa E Ishii, Masaru Ishii, Jacob K Dey, Howard W Francis
OBJECTIVE: To identify factors associated with treatment modality selection in acoustic neuromas. STUDY DESIGN: Prospective observational study. SETTING: Tertiary care neurotology clinic. PATIENTS: Data were prospectively collected from patients initially presenting to a tertiary care neurotology clinic between 2013 and 2016. Patients who did not have magnetic resonance imaging (MRI), demographic, psychometric, or audiometric data were excluded from analysis...
December 7, 2016: Otology & Neurotology
https://www.readbyqxmd.com/read/27921114/-postoperative-imaging-of-the-internal-auditory-canal-visualization-of-active-auditory-implants-german-version
#10
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/27857863/key-perspectives-on-woven-endobridge-device-for-wide-necked-bifurcation-aneurysms-endoscopic-endonasal-clipping-of-intracranial-aneurysms-retrosigmoid-versus-translabyrinthine-approaches-for-acoustic-neuromas-and-impact-of-local-intraoperative-steroid-administration
#11
https://www.readbyqxmd.com/read/27815992/contralateral-hearing-loss-and-facial-palsy-in-an-operated-case-of-vestibular-schwannoma-case-report
#12
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/27765099/-exclusive-endoscopic-transsuprameatal-approach-for-the-pure-intracanalicular-acoustic-neuroma
#13
Q H Zhang, X Y Ding, Z L Wang
No abstract text is available yet for this article.
October 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/27675887/long-term-assessment-of-quality-of-life-and-audiometric-outcomes-in-acoustic-neuroma-patients-treated-with-stereotactic-radiosurgery-srs
#14
K C Lee, J Fergus, K Marvin, A Maitz, S E Macina, M D Manders, E Ducharme, D Bojrab, J Jacob, P Y Chen, I S Grills
No abstract text is available yet for this article.
October 1, 2016: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/27675462/improved-outcomes-in-acoustic-neuroma-patients-receiving-stereotactic-radiosurgery-from-a-single-neurosurgeon-at-a-high-volume-institution
#15
H J Saadatmand, C C Wu, J Lesser, S R Isaacson, T J C Wang, M B Sisti
No abstract text is available yet for this article.
October 1, 2016: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/27675182/frameless-hypofractionated-stereotactic-radiosurgery-for-acoustic-neuromas-a-single-institution-experience
#16
C I Huang, C C Yang, Y W Lin, T Y Kuo, L C Lin
No abstract text is available yet for this article.
October 1, 2016: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/27669695/early-history-of-neurofibromatosis-type-2-and-related-forms-earliest-descriptions-of-acoustic-neuromas-medical-curiosities-misconceptions-landmarks-and-the-pioneers-behind-the-eponyms
#17
Martino Ruggieri, Andrea D Praticò, Agostino Serra, Luigi Maiolino, Salvatore Cocuzza, Rosario Caltabiano, Agata Polizzi
No abstract text is available yet for this article.
September 26, 2016: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/27593791/unilateral-acoustic-neuromas-in-childhood-without-evidence-of-neurofibromatosis-experience-in-10-patients-at-a-single-institute
#18
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/27579562/suspected-acoustic-neuroma-demyelinating-lesions
#19
Xiuming Zhou, Xiang Wang, Xiejun Zhang, Qiang Wu, Guodong Huang, Weiping Li
Demyelinating lesions were recognized as a kind of rare central nervous system demyelinating lesion. The diagnosis and differential diagnosis of demyelinating lesions is difficult. Once the diagnosis was delayed or incorrect, it will make a great impact on patients.Demyelinating lesions often involved in young and middle-aged, but this patient was the aged, which is rare.
August 31, 2016: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/27565388/the-fully-endoscopic-acoustic-neuroma-surgery
#20
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
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