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https://www.readbyqxmd.com/read/28822604/volumetric-modulated-arc-therapy-vmat-for-whole-brain-radiotherapy-not-only-for-hippocampal-sparing-but-also-for-reduction-of-dose-to-organs-at-risk
#1
Sumit Sood, Damodar Pokhrel, Christopher McClinton, Christopher Lominska, Rajeev Badkul, Hongyu Jiang, Fen Wang
A prospective clinical trial, Radiation Therapy Oncology Group (RTOG) 0933, has demonstrated that whole brain radiotherapy (WBRT) using conformal radiation delivery technique with hippocampal avoidance is associated with less memory complications. Further sparing of other organs at risk (OARs) including the scalp, ear canals, cochleae, and parotid glands could be associated with reductions in additional toxicities for patients treated with WBRT. We investigated the feasibility of WBRT using volumetric-modulated arc therapy (VMAT) to spare the hippocampi and the aforementioned OARs...
August 16, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/28822406/-prediction-of-round-window-visibility-in-cochlear-implantation-with-temporal-bone-high-resolution-computed-tomography
#2
S P Sun, W Lu, Y B Lei, X M Men, B Zuo, S G Ding
Objective: To discuss the prediction of round window(RW) visibility in cochlear implantation(CI) with temporal bone high resolution computed tomography(HRCT). Methods: From January 2013 to January 2017, 130 cases underwent both HRCT and CI in our hospital were analyzed. The distance from facial nerve to posterior canal wall(FWD), the angle between facial nerve and inner margin of round window(FRA), and the angle between facial nerve and tympanic anulus to inner margin of round window(FRAA) were detected at the level of round window on axial temporal bone HRCT...
August 7, 2017: Zhonghua Er Bi Yan Hou Tou Jing Wai Ke za Zhi, Chinese Journal of Otorhinolaryngology Head and Neck Surgery
https://www.readbyqxmd.com/read/28820756/telmesani-radiological-classification-of-the-location-of-the-vertical-segment-of-the-facial-nerve-impact-on-surgical-approach-in-cochlear-implant-surgery
#3
Laila Mohammed Telmesani, Mona Khalid Alrammah
OBJECTIVE: This study was conducted to establish a radiological classification of the location of the vertical segment of the facial nerve (VSFN) and to see if this has implications on the surgical technique needed to access the round window niche (RWN) in cochlear implant (CI) surgery. STUDY DESIGN: Observational case series study. SETTING: Tertiary referral center. PATIENTS: One hundred twenty seven patients underwent CI surgery, and high resolution computed tomography (HRCT) of 140 temporal bones was studied...
August 17, 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/28816699/ceruminous-adenoid-cystic-carcinoma-of-external-auditory-canal
#4
Andrew E Ebelhar, Dava S West, Rony K Aouad
An adenoid cystic carcinoma (AdCC) of the ceruminous glands is very rare; its diagnosis is most often challenging, and simple biopsies may be misleading. Our paper describes a case of a circumferential mass of the left ear canal that was initially reported as a basal cell carcinoma on biopsies in the clinic and on frozen sections intraoperatively. The final pathology was an AdCC of the ceruminous glands of the external auditory canal. Our case reflects the difficulty in the diagnosis of an AdCC of the ceruminous gland and the importance of keeping broad differential diagnoses in mind when counseling patients with masses in the ear canals until final pathology is obtained...
August 2017: Journal of International Advanced Otology
https://www.readbyqxmd.com/read/28816689/single-stage-canal-wall-down-mastoidectomy-with-reconstruction-of-the-canal-wall-5-years-experience-in-fayoum-province-egypt
#5
Mohamed Qotb, Tamer Fawzy, Waleed Ragab
OBJECTIVE: Removing the posterior canal wall or canal wall down mastoidectomy (CWDM) for the management of cholesteatoma remains controversial. We advocate partial removal of the posterior canal wall for complete eradication, followed by canal wall defect reconstruction to restore the normal anatomy and avoid the complications of CWDM. MATERIALS AND METHODS: Sixty-four patients with cholesteatoma (71 ears) were included. This study was conducted between 2009 and 2012...
August 2017: Journal of International Advanced Otology
https://www.readbyqxmd.com/read/28803051/variations-in-the-labyrinthine-segment-of-facial-nerve-canal-revealed-by-high-resolution-computed-tomography
#6
Aiyan Jin, Peng Xu, Fengqin Qu
OBJECTIVE: To study variations in the labyrinthine segment of fallopian canal and the associated middle and inner ear malformations. METHOD: The high-resolution computed tomography (HRCT) images of the temporal bone in 24 patients with congenital variations in the labyrinthine segment of fallopian canal were analyzed retrospectively. The length of labyrinthine segment of the facial nerve and angle of the first genu of 10 normal subjects were also measured. Based on the original axial images, multi-planar reformation (MPR) and curved-planar reformation (CPR) images of bilateral ossicular chains, inner ear structure and fallopian canal were reconstructed...
August 9, 2017: Auris, Nasus, Larynx
https://www.readbyqxmd.com/read/28802363/epidemiology-of-cerumen-impaction-among-municipal-kindergartens-children-in-wuhan-china
#7
Chen Ping, Hu Yanling, Wei Youhua, Wang Shufen, Wang Zhinan, Xia Zhongfang
OBJECTIVE: To investigate the epidemiology of cerumen impaction among children of municipal kindergartens in Wuhan. METHODS: The ear canal of children of municipal kindergartens in Wuhan was examined using an electric otoscope by the same otologist in 2005, 2006 and 2012, with age, gender, ears and the nature of cerumen (dry cerumen or wet cerumen) recorded. A chi-square test was performed to investigate for significant differences between cerumen impaction rates and the recorded variables...
September 2017: International Journal of Pediatric Otorhinolaryngology
https://www.readbyqxmd.com/read/28800467/tympanic-membrane-pressure-buffering-function-at-quasi-static-and-low-frequency-pressure-variations
#8
Wasil H M Salih, Pieter G G Muyshondt, Joris J J Dirckx
Deformation of the tympanic membrane is known to contribute to the pressure regulation processes in the middle ear cleft. In this paper we investigated pressure variations in the rabbit middle ear in response to sinusoidal varying pressures applied to the ear canal, with frequencies ranging from 0.5 Hz to 50 Hz and pressure amplitudes ranging between 0.25 kPa and 1 kPa. The transtympanic pressure difference was found to be smallest in the quasi-static range, and quickly increased as a function of frequency...
July 26, 2017: Hearing Research
https://www.readbyqxmd.com/read/28796200/new-infant-cranium-from-the-african-miocene-sheds-light-on-ape-evolution
#9
Isaiah Nengo, Paul Tafforeau, Christopher C Gilbert, John G Fleagle, Ellen R Miller, Craig Feibel, David L Fox, Josh Feinberg, Kelsey D Pugh, Camille Berruyer, Sara Mana, Zachary Engle, Fred Spoor
The evolutionary history of extant hominoids (humans and apes) remains poorly understood. The African fossil record during the crucial time period, the Miocene epoch, largely comprises isolated jaws and teeth, and little is known about ape cranial evolution. Here we report on the, to our knowledge, most complete fossil ape cranium yet described, recovered from the 13 million-year-old Middle Miocene site of Napudet, Kenya. The infant specimen, KNM-NP 59050, is assigned to a new species of Nyanzapithecus on the basis of its unerupted permanent teeth, visualized by synchrotron imaging...
August 9, 2017: Nature
https://www.readbyqxmd.com/read/28796081/the-seasonal-variation-of-benign-paroxysmal-positional-vertigo
#10
Sheneen Meghji, Declan Murphy, Ian Nunney, John S Phillips
OBJECTIVE: Benign paroxysmal positional vertigo (BPPV) is characterized by recurrent episodes of positional vertigo due to dislodged otoconia debris within the semicircular canals. Many studies have proposed a correlation between Vitamin-D deficiency and recurrent BPPV. In the UK, serum Vitamin-D falls during the winter, reaching its lowest level in May and it is highest level in September. We hypothesize that if there is a relationship between BPPV and Vitamin-D levels, one would expect to see a seasonal variation in the incidence of BPPV among UK residents...
August 8, 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/28793961/hearing-loss-in-enlarged-vestibular-aqueduct-and-incomplete-partition-type-ii
#11
Emily Ahadizadeh, Mustafa Ascha, Nauman Manzoor, Amit Gupta, Maroun Semaan, Cliff Megerian, Todd Otteson
PURPOSE: The purpose of this work is to identify the role of incomplete partition type II on hearing loss among patients with enlarged vestibular aqueduct (EVA). BACKGROUND: EVA is a common congenital inner ear malformation among children with hearing loss, where vestibular aqueduct morphology in this population has been shown to correlate to hearing loss. However, the impact of incomplete partition between cochlear turns on hearing loss has not been, despite meaningful implications for EVA pathophysiology...
June 23, 2017: American Journal of Otolaryngology
https://www.readbyqxmd.com/read/28790965/heterogeneity-in-reported-outcome-measures-after-surgery-in-superior-canal-dehiscence-syndrome-a-systematic-literature-review
#12
REVIEW
Mira E Ossen, Robert Stokroos, Herman Kingma, Joost van Tongeren, Vincent Van Rompaey, Yasin Temel, Raymond van de Berg
BACKGROUND: Superior canal dehiscence syndrome (SCDS) can be treated surgically in patients with incapacitating symptoms. However, the ideal treatment has not been determined. OBJECTIVES: This systematic literature review aims to assess available evidence on the comparative effectiveness and risks of different surgical treatments regarding: (1) symptom improvement; (2) objectively measurable auditory and vestibular function; (3) adverse effects, and (4) length of hospitalization...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28777229/the-modified-rambo-transcanal-approach-for-cochlear-implantation-in-charge-syndrome
#13
Cameron C Wick, Amy M Moore, Daniel E Killeen, Brandon Isaacson
OBJECTIVE: CHARGE syndrome is associated with a variety of temporal bone anomalies and deafness. The lack of surgical landmarks and facial nerve irregularities make cochlear implantation in this population a challenging endeavor. This study aims to describe a safe and efficacious transcanal approach for cochlear implantation that obviates the need to perform a mastoidectomy and facial recess. PATIENTS: Three children with profound hearing loss secondary to CHARGE syndrome...
August 2, 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/28775060/measurement-for-detection-of-incomplete-partition-type-ii-anomalies-on-mr-imaging
#14
K L Reinshagen, H D Curtin, A M Quesnel, A F Juliano
BACKGROUND AND PURPOSE: Incomplete partition type II of the cochlea, commonly coexisting with an enlarged vestibular aqueduct, can be a challenging diagnosis on MR imaging due to the presence of a dysplastic spiral lamina-basilar membrane neural complex, which can resemble the normal interscalar septum. The purpose of this study was to determine a reproducible, quantitative cochlear measurement to assess incomplete partition type II anomalies in patients with enlarged vestibular aqueducts using normal-hearing ears as a control population...
August 3, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28764449/intensimetric-detection-of-distortion-product-otoacoustic-emissions-with-ear-canal-calibration
#15
Renata Sisto, Luigi Cerini, Filippo Sanjust, Arturo Moleti
Distortion product otoacoustic emissions (DPOAEs) have been accurately measured with an intensimetric technique, involving simultaneous measure of pressure and velocity in the ear canal, which allows one to correctly calibrate both the input stimuli and the otoacoustic emission (OAE) level. Suitable combinations of standard intensimetric quantities, active intensity and power density [Stanzial, Shiffrer, and Sacchi, J. Acoust. Soc. Am. 131, 269-280 (2012)], are used to equalize the stimuli transmitted to the middle ear, and to estimate the DPOAE level emitted by the eardrum...
July 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28764159/otomycosis-in-a-rural-community-attending-a-tertiary-care-hospital-assessment-of-risk-factors-and-identification-of-fungal-and-bacterial-agents
#16
Priti Agarwal, Leimapokpam Sumitra Devi
INTRODUCTION: Otomycosis is one of the frequently encountered fungal infections of external auditory canal, commonly seen in tropical and subtropical regions of the world. Various host (local, systemic) and environmental factors can predispose a person to otomycosis. Although clinical presentations along with otoscopic findings of the patients are well suggestive of fungal infection, proper identification of causative agents is mandatory in order to prevent recurrences and complications...
June 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28763289/improved-hearing-protector-attenuation-through-the-use-of-a-lubricant
#17
Timothy J Ryan, Rebecca S Meier, Ashley Tatarka
A study of 40 novice hearing protection users was conducted to determine if the use of lubricants with hearing protective plugs would enhance their attenuation. Three types of hearing protection devices (i.e., earplugs) were evaluated: roll-down PVC foam, mushroom-style polyurethane foam, and elastomeric flanged. For each earplug type, the right and left ear (dry and lubricated, respectively) personal attenuation rating was determined using a commercially available microphone in real-ear apparatus. Earplug efficacy was observed to increase in the presence of lubricants for all 3 plug types, with average mean elevations by earplug type ranging from 1...
August 1, 2017: Journal of Occupational and Environmental Hygiene
https://www.readbyqxmd.com/read/28761162/hearables-multimodal-physiological-in-ear-sensing
#18
Valentin Goverdovsky, Wilhelm von Rosenberg, Takashi Nakamura, David Looney, David J Sharp, Christos Papavassiliou, Mary J Morrell, Danilo P Mandic
Future health systems require the means to assess and track the neural and physiological function of a user over long periods of time, and in the community. Human body responses are manifested through multiple, interacting modalities - the mechanical, electrical and chemical; yet, current physiological monitors (e.g. actigraphy, heart rate) largely lack in cross-modal ability, are inconvenient and/or stigmatizing. We address these challenges through an inconspicuous earpiece, which benefits from the relatively stable position of the ear canal with respect to vital organs...
July 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28749307/recurrent-ear-mite-otodectes-cynotis-infestation-in-three-related-groups-of-patagonian-cavies-dolichotis-patagonum
#19
Carolina Lopes da Cruz, Torres Alpino, Jack Kottwitz
:  Two of three groups of Patagonian cavies ( Dolichotis patagonum ) contracted Otodectes cynotis infestations after exposure to mite-infested feral cats. Otodectes cynotis infestations were initially identified in 9 of 10 cavies in group 1. Multiple feral cats with O. cynotis infestations were observed in the vicinity of the Patagonian cavies and were subsequently removed. The Patagonian cavies were initially treated with ivermectin (0.4 mg/kg s.q.) every 2 wk, but ivermectin was discontinued after the third treatment due to injury to one of the Patagonian cavies during capture...
June 2017: Journal of Zoo and Wildlife Medicine: Official Publication of the American Association of Zoo Veterinarians
https://www.readbyqxmd.com/read/28749302/squamous-cell-carcinoma-in-two-snow-leopards-uncia-uncia-with-unusual-auricular-presentation
#20
Benoît Quintard, Eva Maria Greunz, Brice Lefaux, Karin Lemberger, Antoine Leclerc
Squamous cell carcinoma (SCC) is well documented in snow leopards ( Uncia uncia ) and most common locations are oral, facial, or pedal. These two cases illustrate an unusual auricular presentation, which is more often reported in white domestic cats. The animals were aged and presented clinical signs of otitis such as head shaking and ear scratching. Clinical examinations showed auricular canal masses with chronic purulent otitis. In both cases, clinical deterioration led to euthanasia and histology of the ear canal was consistent with SCC and showed numerous vascular emboli...
June 2017: Journal of Zoo and Wildlife Medicine: Official Publication of the American Association of Zoo Veterinarians
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