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https://www.readbyqxmd.com/read/28548616/pediatric-superior-semicircular-canal-dehiscence-illustrative-case-and-systematic-review
#1
Carlito Lagman, Vera Ong, Lawrance K Chung, Lekaa Elhajjmoussa, Christina Fong, Anthony C Wang, Quinton Gopen, Isaac Yang
OBJECTIVE The purpose of this study is to present an illustrative case of pediatric superior semicircular canal dehiscence (SSCD) and to systematically review the current published literature in the pediatric population. METHODS An electronic search of the Scopus, Web of Science, PsycINFO, Cochrane, and Embase databases was performed by 2 independent authors through January 2017. Search term combinations included "pediatrics," "children," "canal," and "dehiscence." Inclusion criteria were as follows: English, full-text clinical studies, case reports, and case series describing pediatric patient(s) (younger than 18 years) with CT evidence of SSCD...
May 26, 2017: Journal of Neurosurgery. Pediatrics
https://www.readbyqxmd.com/read/28532527/how-i-do-it-underwater-endoscopic-ear-surgery-for-plugging-in-superior-canal-dehiscence-syndrome
#2
D Yamauchi, Y Hara, H Hidaka, T Kawase, Y Katori
BACKGROUND: Underwater endoscopic ear surgery does not require suction and so protects the inner ear from unexpected aeration that may damage its function in the treatment of labyrinthine fistula. A method of underwater endoscopic ear surgery is proposed for the treatment of superior canal dehiscence. METHODS: Underwater endoscopic ear surgery was performed for plugging of the superior semicircular canal through the transmastoid approach. Saline solution was infused into the mastoid cavity through an Endo-Scrub Lens Cleaning Sheath...
May 23, 2017: Journal of Laryngology and Otology
https://www.readbyqxmd.com/read/28530263/utricular-hypofunction-in-patients-with-type-2-diabetes-mellitus
#3
K Jáuregui-Renaud, C Aranda-Moreno, A Herrera-Rangel
The aim of this study was to assess the function of the utricle and horizontal semicircular canals in patients with type 2 diabetes mellitus receiving primary health care, with/without a history of falls. 101 patients with type 2 diabetes mellitus, 34 to 84 years old (26 with and 75 without a history of falls) and 51 healthy volunteers (40-83 years old) accepted to participate. They denied having a history of dizziness, vertigo, unsteadiness, hearing loss or neurological disorders. None of them were seeking care due to sensory or balance decline...
May 22, 2017: Acta Otorhinolaryngologica Italica
https://www.readbyqxmd.com/read/28523740/new-data-about-semicircular-canal-morphology-and-locomotion-in-modern-hominoids
#4
Anne Le Maître, Philipp Schuetz, Patrick Vignaud, Michel Brunet
The labyrinth has two functional parts: the cochlea for audition and the vestibular system for equilibrioception. In the latter, the semicircular ducts and the otolithic organs are sensitive to rotational and linear accelerations of the head, respectively. The labyrinthine morphology influences perception accuracy, hence the adaptation to a specific locomotor pattern. The aim of this study is to determine the relationship between locomotion and semicircular canal morphology using geometric morphometrics, and to explain these links with existing functional models...
May 19, 2017: Journal of Anatomy
https://www.readbyqxmd.com/read/28521355/minimally-invasive-middle-fossa-keyhole-craniectomy-for-repair-of-superior-semicircular-canal-dehiscence
#5
Trieu Vanessa, Panayiotis E Pelargos, Marko Spasic, Lawrance K Chung, Brittany Voth, Nolan Ung, Quinton Gopen, Isaac Yang
BACKGROUND: Superior semicircular canal dehiscence (SSCD) presents with varying degrees of auditory and vestibular dysfunction. The condition is confirmed on high-resolution computed tomography (CT) imaging, and symptoms are often improved by surgical repair. Although a classic middle fossa craniotomy has been used with good results, recent advances in technique have allowed for modification of the traditional approach into a smaller skin incision and a minimally invasive middle fossa keyhole craniectomy roughly 1...
June 1, 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/28516487/the-petrosal-and-bony-labyrinth-of-diplobune-minor-an-enigmatic-artiodactyla-from-the-oligocene-of-western-europe
#6
Maeva J Orliac, Ricardo Araújo, Fabrice Lihoreau
Anoplotheriinae are Paleogene European artiodactyls that present a unique postcranial morphology with a tridactyl autopodium and uncommon limb orientation. This peculiar morphology led to various hypotheses regarding anoplotheriine locomotion from semiaquatic to partly arboreal or partly bipedal. The petrosal bone, housing the organs of balance, and hearing, offers complementary information to postcranial morphology on the ecology of this uncommon artiodactyl. Here, we investigate the middle ear and bony labyrinth of the small anoplotheriine Diplobune minor based on four specimens from the Early Oligocene locality of Itardies (Quercy, France)...
May 17, 2017: Journal of Morphology
https://www.readbyqxmd.com/read/28504186/alagille-s-syndrome-hypoplasia-of-posterior-semicircular-canals
#7
Alexandre Perez-Girbes, Miguel Mazón, Elena Pont
No abstract text is available yet for this article.
May 11, 2017: Acta Otorrinolaringológica Española
https://www.readbyqxmd.com/read/28503164/superior-canal-dehiscence-syndrome-lessons-from-the-first-20-years
#8
REVIEW
Bryan K Ward, John P Carey, Lloyd B Minor
Superior semicircular canal dehiscence syndrome was first reported by Lloyd Minor and colleagues in 1998. Patients with a dehiscence in the bone overlying the superior semicircular canal experience symptoms of pressure or sound-induced vertigo, bone conduction hyperacusis, and pulsatile tinnitus. The initial series of patients were diagnosed based on common symptoms, a physical examination finding of eye movements in the plane of the superior semicircular canal when ear canal pressure or loud tones were applied to the ear, and high-resolution computed tomography imaging demonstrating a dehiscence in the bone over the superior semicircular canal...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28502274/superior-petrosal-sinus-causing-superior-canal-dehiscence-syndrome
#9
S M D Schneiders, J W Rainsbury, E F Hensen, R M Irving
OBJECTIVE: To determine signs and symptoms for superior canal dehiscence syndrome caused by the superior petrosal sinus. METHODS: A review of the English-language literature on PubMed and Embase databases was conducted, in addition to a multi-centre case series report. RESULTS: The most common symptoms of 17 patients with superior petrosal sinus related superior canal dehiscence syndrome were: hearing loss (53 per cent), aural fullness (47 per cent), pulsatile tinnitus (41 per cent) and pressure-induced vertigo (41 per cent)...
May 15, 2017: Journal of Laryngology and Otology
https://www.readbyqxmd.com/read/28496432/vestibular-loss-in-older-adults-is-associated-with-impaired-spatial-navigation-data-from-the-triangle-completion-task
#10
Yanjun Xie, Robin T Bigelow, Scott F Frankenthaler, Stephanie A Studenski, Scott D Moffat, Yuri Agrawal
BACKGROUND: Vestibular inputs have been shown to play a critical role in spatial navigation. In this study, we sought to evaluate whether vestibular loss due to aging contributes to impaired spatial navigation as measured by the triangle completion task (TCT). MATERIALS AND METHODS: We recruited three types of participants: young controls <55 years of age, older controls ≥55 years of age, and older patients from a Neurotology Clinic with evidence of vestibular physiologic impairment but who did not have any known vestibular disorder...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28484680/superior-semicircular-canal-dehiscence-in-a-patient-with-ehlers-danlos-syndrome-a-case-report
#11
Lawrance K Chung, Carlito Lagman, Daniel T Nagasawa, Quinton Gopen, Isaac Yang
Superior semicircular canal dehiscence (SSCD) is a bony defect in the middle cranial fossa floor that results in an abnormal connection between the inner ear and cranial vault. Although the etiology of SSCD remains unclear, an inappropriately thin or fragile temporal bone likely predisposes an individual towards developing SSCD. Ehlers-Danlos syndrome (EDS) constitutes a group of genetic connective tissue disorders caused by a defect in the production, processing, or structure of collagen, or its associated proteins...
April 6, 2017: Curēus
https://www.readbyqxmd.com/read/28481172/clinical-decision-making-to-address-poor-outcomes-in-persistent-horizontal-semicircular-canal-benign-paroxysmal-positional-vertigo-a-case-study
#12
Brian M Moore
BACKGROUND: Horizontal semicircular canal BPPV (HSC-BPPV) can occur in 10-30% of BPPV cases. Lower success rates are reported for HSC-BPPV. The apogeotropic form of HSC-BPPV is more difficult to treat, as 5-40% of cases are described to be refractory to repositioning maneuvers. PURPOSE: To describe the assessment and treatment of a patient presenting with HSC-BPPV and to demonstrate the potential use of Forced-Prolonged Positioning (FPP) as a home exercise program (HEP) for persistent HSC-BPPV in an elderly patient...
May 2017: Physiotherapy Theory and Practice
https://www.readbyqxmd.com/read/28479521/the-retrolabyrinthine-presigmoid-approach-to-the-anterior-cerebellopontine-region-expanding-the-limits-of-trautmann-s-triangle
#13
Fernando Alonso, Simone E Dekker, James Wright, Christina Wright, Andrea Alonso, Margaret Carmody, R Shane Tubbs, Nicholas C Bambakidis
The anatomical area exposed through the exposure of Trautmann's triangle may not be sufficient. We studied the additional exposure provided by skeletonizing the sigmoid sinus. Human cadaver heads were subjected to a thin temporal bone CT scan for a total of 10 sides. The estimated surgical working angle was calculated based on the relationship of the sigmoid sinus to the posterior semicircular canal, superior petrosal sinus and jugular bulb on imaging. The heads were then subjected to a mastoidectomy and remeasured with and without sigmoid sinus skeletonization...
May 4, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28477092/-intracochlear-schwannoma-tumor-removal-via-subtotal-cochleostomy-and-partial-cochlear-reconstruction-with-preservation-of-semicircular-canal-function-german-version
#14
S Plontke, S Kösling, N Pazaitis, T Rahne
We report about a patient who in 2005, aged 37 years, experienced sudden mild to moderate, mid-frequency sensorineural hearing loss in the right ear along with tinnitus and mild dizziness. MRI of the temporal bone revealed a very small (1 mm) contrast-enhancing lesion in the second turn of the right cochlea. Hearing gradually deteriorated with complete hearing loss in 2015. At this time, an MRI scan showed a lesion completely filling the cochlea.The tumor was removed via transmeatal subtotal cochleostomy...
May 5, 2017: HNO
https://www.readbyqxmd.com/read/28470420/numerical-modeling-of-the-cupular-displacement-and-motion-of-otoconia-particles-in-a-semicircular-canal
#15
Tijana Djukic, Nenad Filipovic
Balance is achieved and maintained by a balance system called a labyrinth that is composed of three semicircular canals and the otolith organs that sense linear gravity and acceleration. Within each semicircular canal, there is a gelatinous structure called the cupula, which is deformed under the influence of the surrounding endolymph. One of the balance disorders is benign paroxysmal positional vertigo, and one of the pathological conditions that have been identified as possible causes of this syndrome is canalithiasis-disturbance of the endolymph flow and cupular displacement caused by the free-moving otoconia particles within the lumen of the canal...
May 3, 2017: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/28462034/virtual-reconstruction-of-the-endocranial-anatomy-of-the-early-jurassic-marine-crocodylomorph-pelagosaurus-typus-thalattosuchia
#16
Stephanie E Pierce, Megan Williams, Roger B J Benson
Thalattosuchians were highly specialised aquatic archosaurs of the Jurassic and Early Cretaceous, and represent a peak of aquatic adaptation among crocodylomorphs. Relatively little is known of their endocranial anatomy or its relevance for the evolution of sensory systems, physiology, and other aspects of biology. Nevertheless, such data have significance for two reasons: (1) thalattosuchians represent an important data point regarding adaptation to marine life in tetrapods; and (2) as early-diverging members of the crocodylian stem-lineage, thalattosuchians provide information on the evolutionary assembly of the brain and other endocranial structures in crocodylomorphs...
2017: PeerJ
https://www.readbyqxmd.com/read/28459129/time-saving-and-fail-safe-dissection-method-for-vestibulocochlear-organs-in-gross-anatomy-classes
#17
Ryoji Suzuki, Naoaki Konno, Akimitsu Ishizawa, Yoshinori Kanatsu, Kodai Funakoshi, Hideo Akashi, Ming Zhou, Hiroshi Abe
Because the vestibulocochlear organs are tiny and complex, and are covered by the petrous part of the temporal bone, they are very difficult for medical students to dissect and visualize during gross anatomy classes. Here, we report a time-saving and fail-safe procedure we have devised, using a hand-held hobby router. Nine en bloc temporal bone samples from donated human cadavers were used as trial materials for devising an appropriate procedure for dissecting the vestibulocochlear organs. A hand-held hobby router was used to cut through the temporal bone...
April 29, 2017: Clinical Anatomy
https://www.readbyqxmd.com/read/28452186/eocene-paleoecology-of-adapis-parisiensis-primate-adapidae-from-inner-ear-to-lifestyle
#18
Margot Bernardi, Sébastien Couette
European adapids, especially Adapis parisiensis, have been extensively studied over the past two centuries, essentially for taxonomic and phylogenetic purposes. Analyses of dental, cranial and postcranial morphology have led to various hypotheses about the diet, locomotion and lifestyle of this fossil primate species. As the morphology of Adapis parisiensis is not directly comparable to any extant species, some interpretations are still debated. The inner ear is crucial to several functional parameters, such as auditory acuity, balance, agility, orientation and head motion speed during locomotion...
April 27, 2017: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/28446583/a-shared-neural-integrator-for-human-posture-control
#19
Stephanie E Haggerty, Amy R Wu, Kathleen H Sienko, Arthur D Kuo
Control of standing posture requires fusion of multiple inputs including visual, vestibular, somatosensory, and other sensors, each having distinct dynamics. The semicircular canals, for example, have a high-pass filter response to angular velocity, quickly sensing a step change in head rotational velocity followed by a decay. To stabilize gaze despite this decay, the central nervous system supplies a neural "velocity storage" integrator, a filter that extends the angular velocity signal. Similar filtering might contribute temporal dynamics to posture control, as suggested by some state estimation models...
April 26, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28443060/the-vestibular-implant-hearing-preservation-during-intralabyrinthine-electrode-insertion-a-case-report
#20
Raymond van de Berg, Florence Lucieer, Nils Guinand, Joost van Tongeren, Erwin George, Jean-Philippe Guyot, Herman Kingma, Marc van Hoof, Yasin Temel, Jacobus van Overbeeke, Angelica Perez-Fornos, Robert Stokroos
OBJECTIVE: The vestibular implant seems feasible as a clinically useful device in the near future. However, hearing preservation during intralabyrinthine implantation remains a challenge. It should be preserved to be able to treat patients with bilateral vestibulopathy and (partially) intact hearing. This case study investigated the feasibility of hearing preservation during the acute phase after electrode insertion in the semicircular canals. METHODS: A 40-year-old woman with normal hearing underwent a translabyrinthine approach for a vestibular schwannoma Koos Grade IV...
2017: Frontiers in Neurology
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