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https://www.readbyqxmd.com/read/29342039/an-optimal-partial-ossicular-prosthesis-should-connect-both-to-the-tympanic-membrane-and-malleus-a-temporal-bone-study-using-laser-doppler-vibrometry
#1
Anders Niklasson, Kilian Gladiné, Anton Rönnblom, Magnus von Unge, Joris Dirckx, Krister Tano
OBJECTIVE: To compare stapes vibrations in different partial ossicular replacement prosthesis (PORP) applications. METHODS: Stapedial vibrations were measured on fresh frozen human temporal bones with laser Doppler vibrometry. Eight different types of common ossiculoplasty methods were compared regarding recovery of stapes vibrations in relation with the normal ossicular chain. The PORPs were divided into three groups: 1) PORPs with the lateral contact only with the tympanic membrane, 2) PORPs with lateral contact only to the malleus handle, and 3) PORPs with lateral contact with both the malleus handle and the tympanic membrane...
January 16, 2018: Otology & Neurotology
https://www.readbyqxmd.com/read/29313370/bilateral-ossicular-head-dehiscence-into-the-middle-cranial-fossa
#2
Sameer A Alvi, Joel W Jones, Jim Lin
OBJECTIVES: To describe a unique case of bilateral dehiscence of the malleus and incus heads into the middle fossa making contact with the temporal lobes, along with its clinical implications. METHODS: An analysis of a patient case and review of pertinent literature were performed. RESULTS: A patient with a history of right-sided mastoidectomy for cholesteatoma was evaluated for persistent conductive hearing loss. On computed tomography (CT) and magnetic resonance imaging (MRI), the patient had a complete dehiscence of the tegmen tympani on the right, with ossicular heads being located above the floor of the middle cranial fossa...
January 1, 2018: Annals of Otology, Rhinology, and Laryngology
https://www.readbyqxmd.com/read/29229399/the-malleus-cap-anatomic-description-of-cartilage-of-the-lateral-process-of-the-malleus
#3
Elias Michaelides, Ankit Kansal, Sara Rutter, Christopher A Schutt
PURPOSE: To anatomically describe a cartilaginous cap attached to the lateral process of the malleus. STUDY DESIGN: Histologic and gross anatomic review. METHODS: Twenty temporal bones were histologically reviewed. The anatomical relationship between the tympanic membrane and malleus was then defined at the level of the lateral process of the malleus and the long process of the malleus. Separately, gross evaluation of these levels at the macroscopic level was undertaken through endoscopic imaging in five subjects...
October 25, 2017: American Journal of Otolaryngology
https://www.readbyqxmd.com/read/29205455/the-middle-and-inner-ears-of-the-palaeogene-golden-mole-namachloris-a-comparison-with-extant-species
#4
Matthew J Mason, Nigel C Bennett, Martin Pickford
Many living species of golden moles (Chrysochloridae) have greatly enlarged middle ear ossicles, believed to be used in the detection of ground vibrations through inertial bone conduction. Other unusual features of chrysochlorids include internally coupled middle ear cavities and the loss of the tensor tympani muscle. Our understanding of the evolutionary history of these characteristics has been limited by the paucity of fossil evidence. In this article, we describe for the first time the exquisitely preserved middle and inner ears of Namachloris arenatans from the Palaeogene of Namibia, visualised using computed tomography, as well as ossicles attributed to this species...
December 4, 2017: Journal of Morphology
https://www.readbyqxmd.com/read/29201373/free-anterolateral-thigh-full-thickness-skin-flap-with-vascularized-lateral-femoral-cutaneous-nerve-for-the-reconstruction-of-facial-nerve-and-external-auditory-canal-after-the-resection-of-facial-nerve-schwannoma
#5
Ryo Karakawa, Mitsunaga Narushima, Shinya Ogishima, Hisako Hara, Shotaro Karino, Takuya Iida, Akinobu Kakigi, Isao Koshima
The complex reconstruction of nerves and soft tissue in the head and neck region is still challenging, especially in cases requiring external auditory canal reconstruction with facial nerve reconstruction. We report a case of left facial schwannoma extending into the external auditory canal beyond the tympanic membrane with facial paralysis in which the reconstruction of both the facial nerve and external auditory canal was successfully performed using an anterolateral thigh flap as a super-thin full-thickness skin flap, including vascularized lateral femoral cutaneous nerve...
2017: SAGE Open Medical Case Reports
https://www.readbyqxmd.com/read/29171281/complete-malleus-removal-for-cholesteatoma-a-multivariate-analysis-of-ossiculoplasty-success-and-residual-disease
#6
Scott Shapiro, Donald Bennett, Stephen Wetmore, Adam Cassis
OBJECTIVE: Determine the effect of complete malleus removal during canal wall up tympanomastoidectomy for cholesteatoma on ossiculoplasty success and rate of residual cholesteatoma. METHODS: We reviewed the operative, audiogram, and clinical reports of patients who underwent canal wall up tympanomastoidectomy for cholesteatoma between 2009 and 2016 at a tertiary academic medical center with at least 8 months of follow-up after surgery. To control for extent of disease, we independently catalogued the subsites of the middle ear and mastoid that cholesteatoma involved from each operation...
November 1, 2017: Annals of Otology, Rhinology, and Laryngology
https://www.readbyqxmd.com/read/29132143/a-jurassic-gliding-euharamiyidan-mammal-with-an-ear-of-five-auditory-bones
#7
Gang Han, Fangyuan Mao, Shundong Bi, Yuanqing Wang, Jin Meng
Gliding is a distinctive locomotion type that has been identified in only three mammal species from the Mesozoic era. Here we describe another Jurassic glider that belongs to the euharamiyidan mammals and shows hair details on its gliding membrane that are highly similar to those of extant gliding mammals. This species possesses a five-boned auditory apparatus consisting of the stapes, incus, malleus, ectotympanic and surangular, representing, to our knowledge, the earliest known definitive mammalian middle ear...
November 23, 2017: Nature
https://www.readbyqxmd.com/read/29068074/the-anterior-process-of-the-malleus-in-extant-lagomorpha-mammalia
#8
Wolfgang Maier, Adrian Tröscher, Irina Ruf
The anterior anchoring of the malleus of 30 extant species of Lagomorpha (rabbits, hares, pikas) has been studied on the basis of histological serial sections and µCT-scans. It is shown that former studies of Oryctolagus, Lepus, and Ochotona are incomplete, because the rostral part of the processus anterior of the malleus is always lacking due to damage of this extremely delicate structure. Our study shows that in perinatal stages of Leporidae the praearticulare develops a prominent processus internus that fits into a groove at the ventral side of the tegmen tympani; this "tongue and groove"-arrangement may act as a hinge...
October 25, 2017: Journal of Morphology
https://www.readbyqxmd.com/read/28989763/into-the-dark-patterns-of-middle-ear-adaptations-in-subterranean-eulipotyphlan-mammals
#9
Daisuke Koyabu, Misato Hosojima, Hideki Endo
Evolution of the middle ear ossicles was a key innovation for mammals, enhancing the transmission of airborne sound. Radiation into various habitats from a terrestrial environment resulted in diversification of the auditory mechanisms among mammals. However, due to the paucity of phylogenetically controlled investigations, how middle ear traits have diversified with functional specialization remains unclear. In order to identify the respective patterns for various lifestyles and to gain insights into fossil forms, we employed a high-resolution tomography technique and compared the middle ear morphology of eulipotyphlan species (moles, shrews and hedgehogs), a group that has radiated into various environments, such as terrestrial, aquatic and subterranean habitats...
September 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/28964300/anatomical-measurement-of-the-ossicles-in-patients-with-congenital-aural-atresia-and-stenosis
#10
Jieying Li, Keguang Chen, Chenlong Li, Dongming Yin, Tianyu Zhang, Peidong Dai
OBJECTIVES: Our aims were to measure and compare anatomical parameters of the ossicles in normal, congenital aural stenosis (CAS), and congenital aural atresia (CAA) ears. METHODS: This retrospective study was performed using three-dimensional reconstructed images derived from computed tomography scans of 20 normal subjects, 20 CAS patients, and 20 CAA patients. RESULTS: The lengths of the malleus handle and long process of the incus were greater in normal ears than in CAS and CAA ears (all P < 0...
October 2017: International Journal of Pediatric Otorhinolaryngology
https://www.readbyqxmd.com/read/28959031/coup-tfii-is-required-for-morphogenesis-of-the-neural-crest-derived-tympanic-ring
#11
Wen-Hsin Hsu, Chun-Ming Chen, Li-Ru You
Chicken Ovalbumin Upstream Promoter-Transcription Factor II (COUP-TFII) plays pivotal roles in cell growth, cell differentiation, and cell fate determination. Although genome-wide studies have identified COUP-TFII binding on gene sets mainly involved in neural crest cell (NCC) development and craniofacial morphogenesis, the direct functional connection between COUP-TFII and NCCs in vivo has not been well characterized. In this study, we show that COUP-TFII is expressed in the subpopulation of NCCs and its derivatives, and targeted ablation of COUP-TFII in mouse NCCs results in markedly shortened and bifurcated tympanic rings, which in turn disturb the caudal direction of external acoustic meatus invagination...
September 28, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28924582/data-on-the-effect-of-conductive-hearing-loss-on-auditory-and-visual-cortex-activity-revealed-by-intrinsic-signal-imaging
#12
Manuel Teichert, Jürgen Bolz
This data article provides additional data related to the research article entitled "Simultaneous intrinsic signal imaging of auditory and visual cortex reveals profound effects of acute hearing loss on visual processing" (Teichert and Bolz, 2017) [1]. The primary auditory and visual cortex (A1 and V1) of adult male C57BL/6J mice (P120-P240) were mapped simultaneously using intrinsic signal imaging (Kalatsky and Stryker, 2003) [2]. A1 and V1 activity evoked by combined auditory and visual stimulation were measured before and after conductive hearing loss (CHL) induced by bilateral malleus removal...
October 2017: Data in Brief
https://www.readbyqxmd.com/read/28855058/comparison-between-clinical-and-audiological-results-of-tympanoplasty-with-double-layer-graft-modified-sandwich-fascia-technique-and-single-layer-graft-underlay-fascia-and-underlay-cartilage-technique
#13
Sanjana Vijay Nemade, Kiran Jaywant Shinde, Pratibha Bharat Sampate
INTRODUCTION: Surgical repair of the tympanic membrane, termed a type one tympanoplasty is a tried and tested treatment modality. Overlay or underlay technique of tympanoplasty is common. Sandwich Tympanoplasty is the combined overlay and underlay grafting of tympanic membrane. OBJECTIVE: To describe and evaluate the modified sandwich graft (mediolateral double layer graft) tympanoplasty using temporalis fascia and areolar fascia. To compare the clinical and audiological outcome of modified sandwich tympanoplasty with underlay tympanoplasty...
August 27, 2017: Auris, Nasus, Larynx
https://www.readbyqxmd.com/read/28852952/atlas-based-segmentation-of-temporal-bone-anatomy
#14
Kimerly A Powell, Tong Liang, Brad Hittle, Don Stredney, Thomas Kerwin, Gregory J Wiet
PURPOSE: To develop a time-efficient automated segmentation approach that could identify critical structures in the temporal bone for visual enhancement and use in surgical simulation software. METHODS: An atlas-based segmentation approach was developed to segment the cochlea, ossicles, semicircular canals (SCCs), and facial nerve in normal temporal bone CT images. This approach was tested in images of 26 cadaver bones (13 left, 13 right). The results of the automated segmentation were compared to manual segmentation visually and using DICE metric, average Hausdorff distance, and volume similarity...
November 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28846798/recognizing-malleus-fracture-in-a-woman-with-a-head-injury-after-a-fall
#15
Janet S Choi, Nathan Tu, John L Go, Elina Kari
No abstract text is available yet for this article.
August 2017: Ear, Nose, & Throat Journal
https://www.readbyqxmd.com/read/28812679/meckel-s-cartilage-breakdown-offers-clues-to-mammalian-middle-ear-evolution
#16
Neal Anthwal, Daniel J Urban, Zhe-Xi Luo, Karen E Sears, Abigail S Tucker
A key transformation in mammalian ear evolution was incorporation of the primary jaw joint of premammalian synapsids into the definitive mammalian middle ear of living mammals. This evolutionary transition occurred in two steps, starting with a partial or 'transitional' mammalian middle ear in which the ectotympanic and malleus were still connected to the mandible by an ossified Meckel's cartilage (MC), as observed in many Mesozoic mammals. This was followed by MC breakdown, freeing the ectotympanic and the malleus from the mandible and creating the definitive mammalian middle ear...
March 6, 2017: Nature Ecology & Evolution
https://www.readbyqxmd.com/read/28758555/sequential-motion-of-the-ossicular-chain-measured-by-laser-doppler-vibrometry
#17
Yasuomi Kunimoto, Kensaku Hasegawa, Shiro Arii, Hideyuki Kataoka, Hiroaki Yazama, Junko Kuya, Kazunori Fujiwara, Hiromi Takeuchi
OBJECTIVE: In order to help a surgeon make the best decision, a more objective method of measuring ossicular motion is required. METHODS: A laser Doppler vibrometer was mounted on a surgical microscope. To measure ossicular chain vibrations, eight patients with cochlear implants were investigated. To assess the motions of the ossicular chain, velocities at five points were measured with tonal stimuli of 1 and 3 kHz, which yielded reproducible results. The sequential amplitude change at each point was calculated with phase shifting from the tonal stimulus...
July 31, 2017: Acta Oto-laryngologica
https://www.readbyqxmd.com/read/28751512/flat-panel-angiography-in-the-cross-sectional-imaging-of-the-temporal-bone-assessment-of-image-quality-and-radiation-dose-compared-with-a-64-section-multisection-ct-scanner
#18
G Conte, E Scola, S Calloni, R Brambilla, M Campoleoni, L Lombardi, F Di Berardino, D Zanetti, L M Gaini, F Triulzi, C Sina
BACKGROUND AND PURPOSE: Cross-sectional imaging of the temporal bone is challenging because of the complexity and small dimensions of the anatomic structures. We evaluated the role of flat panel angiography in the cross-sectional imaging of the temporal bone by comparing its image quality and radiation dose with a 64-section multisection CT scanner. MATERIALS AND METHODS: We retrospectively collected 29 multisection CT and 29 flat panel angiography images of normal whole-head temporal bones...
July 27, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28719404/predictive-factors-for-hearing-outcomes-after-canaloplasty-in-patients-with-congenital-aural-atresia
#19
Jungmin Ahn, Sun Young Baek, Kyunga Kim, Yang-Sun Cho
OBJECTIVE: The aim of this study was to determine the most important factors in preoperative imaging, including components of Jahrsdoefer score (J score), and favorable prognostic factors for postoperative hearing results after canaloplasty for congenital aural atresia. STUDY DESIGN: Retrospective review of medical records. SETTING, PATIENTS, INTERVENTION, MAIN OUTCOME MEASURE: One hundred eight patients who underwent canaloplasty by a single surgeon between January 2011 and July 2014 were included...
September 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/28711236/temporal-bone-computed-tomography-findings-associated-with-feasibility-of-endoscopic-ear-surgery
#20
Dunia Abdul-Aziz, Elliott D Kozin, Brian M Lin, Kevin Wong, Parth V Shah, Aaron K Remenschneider, Lukas D Landegger, Amy F Juliano, Michael S Cohen, Daniel J Lee
PURPOSE: There are no formal radiologic criteria to stratify patients for transcanal (TEES) or transmastoid endoscopic ear surgery for resection of cholesteatoma. We aim to determine 1) whether standard preoperative computed tomography (CT) findings are associated with the need for conversion to a transmastoid approach and 2) the amount of time added for conversion from TEES to transmastoid techniques. MATERIALS AND METHODS: Retrospective chart review of consecutive pediatric and adult cases of TEES for primary cholesteatoma from 2013 through 2015 (n=52)...
June 14, 2017: American Journal of Otolaryngology
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