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https://www.readbyqxmd.com/read/29097033/-the-tumors-of-the-ear
#1
X Dubernard, J-C Kleiber, E Brenet, M-A Louges, Y Veleine, M Labrousse, M Makeieff, A Bazin, A Chays
Any cutaneous lesion of the outer ear must be managed jointly by a dermatologist and an ENT, regardless of the age of the patient. The presence of a malignant cutaneous carcinoma (Squamous cell carcinoma or melanoma) of the pavilion requires a minimum extension assessment by a cervical ultrasound, CT-scan and MRI will be prescribed according to the degree of infiltration and the presence of clinics signs (lymphadenopathy, facial paralysis, cognitive impairment). A polyp of the external auditory meatus must be systematically biopsied in consultation and, if necessary, in the operating room with fresh anatomopathological analysis...
October 30, 2017: La Presse Médicale
https://www.readbyqxmd.com/read/29067619/transparent-model-of-temporal-bone-and-vestibulocochlear-organ-made-by-3d-printing
#2
Ryoji Suzuki, Naoto Taniguchi, Fujio Uchida, Akimitsu Ishizawa, Yoshinori Kanatsu, Ming Zhou, Kodai Funakoshi, Hideo Akashi, Hiroshi Abe
The vestibulocochlear organ is composed of tiny complex structures embedded in the petrous part of the temporal bone. Landmarks on the temporal bone surface provide the only orientation guide for dissection, but these need to be removed during the course of dissection, making it difficult to grasp the underlying three-dimensional structures, especially for beginners during gross anatomy classes. We report herein an attempt to produce a transparent three-dimensional-printed model of the human ear. En bloc samples of the temporal bone from donated cadavers were subjected to computed tomography (CT) scanning, and on the basis of the data, the surface temporal bone was reconstructed with transparent resin and the vestibulocochlear organ with white resin to create a 1:1...
October 24, 2017: Anatomical Science International
https://www.readbyqxmd.com/read/29057182/anterior-inferior-cerebellar-arteries-juxtaposed-with-the-internal-acoustic-meatus-and-their-relationship-to-the-cranial-nerve-vii-viii-complex
#3
Fernando Alonso, Mohammad W Kassem, Joe Iwanaga, Rod J Oskouian, Marios Loukas, Amin Demerdash, R Shane Tubbs
Vascular loops in the cerebellopontine angle (CPA) and their relationship to cranial nerves have been used to explain neurological symptoms. The anterior inferior cerebellar artery (AICA) has variable branches producing vascular loops that can compress the facial cranial nerve (CN) VII and vestibulocochlear (CN VIII) nerves. AICA compression of the facial-vestibulocochlear nerve complex can lead to various clinical presentations, including hemifacial spasm (HFS), tinnitus, and hemiataxia. The formation of arterial loops inside or outside of the internal auditory meatus (IAM) can cause abutment or compression of CN VII and CN VIII...
August 16, 2017: Curēus
https://www.readbyqxmd.com/read/28983447/surgical-management-and-outcome-experience-of-53-cerebellopontine-angle-meningiomas
#4
Xiaosheng He, Weiping Liu, Yangang Wang, Jun Zhang, Buqing Liang, Jason H Huang
Background Meningiomas follow schwannomas as the second most common cerebellopontine angle (CPA) tumors. We investigate the diagnosis, management, and prognosis of this disease. Methods We reviewed the cases with the CPA meningiomas in our institution in Shaanxi, China from January 2012 to December 2015. Charts were retrospectively examined and patients were divided into two groups: 1) surgical treatment with a retrosigmoid approach for tumor resection and 2) stereotactic radiosurgery treatment only. Patients were followed up and outpatient records were also reviewed...
August 3, 2017: Curēus
https://www.readbyqxmd.com/read/28967306/retrosigmoid-transmeatal-and-suprajugular-approach-for-cerebellopontine-angle-meningioma-operative-video
#5
Ken Matsushima, Michihiro Kohno
Surgical management of cerebellopontine angle meningiomas is challenging due to the intricate neurovascular structures within the limited operative field and the compression of eloquent structures including the brainstem. Surgery on tumors extending into the temporal bone is especially difficult and demands complicated approaches. However, modifications to the retrosigmoid approach utilizing intradural temporal bone drilling enable access to such tumoral extensions without any additional invasive approaches...
October 2017: Neurosurgical Focus
https://www.readbyqxmd.com/read/28962910/occipital-and-external-acoustic-meatus-to-axis-angle-as-a-predictor-of-the-oropharyngeal-space-in-healthy-volunteers-a-novel-parameter-for-craniocervical-junction-alignment
#6
Kazuaki Morizane, Mitsuru Takemoto, Masashi Neo, Shunsuke Fujibayashi, Bungo Otsuki, Tomotoshi Kawata, Shuichi Matsuda
BACKGROUND CONTEXT: The occipito-C2 angle (O-C2a) influences the oropharyngeal space. However, O-C2a has several limitations. There is no normal value of O-C2a because of the wide individual variations, and O-C2a does not reflect translation of the cranium to the axis, another factor influencing the oropharyngeal space in patients with atlantoaxial subluxation. PURPOSE: The objective of this study was to propose a novel parameter that accounts for craniocervical junction alignment (CJA) and the oropharyngeal space...
September 28, 2017: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/28959031/coup-tfii-is-required-for-morphogenesis-of-the-neural-crest-derived-tympanic-ring
#7
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/28939186/is-the-lateral-angle-of-the-internal-acoustic-canal-sexually-dimorphic-in-non-adults-an-investigation-by-routine-cranial-magnetic-resonance-imaging
#8
G O Afacan, T Onal, G Akansel, A S Arslan
The lateral angle of the internal acoustic canal is one of the measurements of petrous bone that has been previously studied for sex estimation, mostly in adults. We aimed at evaluating the effects of age, side, and sex on the lateral angle of the internal acoustic canal in pediatric patients. Pediatric routine cranial MRI studies were retrospectively investigated for this study. The lateral angle was measured on T2-weighted axial images when the anterior and posterior lips of the meatus and the cochlea were clearly visible on the same image...
October 2017: Homo: Internationale Zeitschrift Für die Vergleichende Forschung Am Menschen
https://www.readbyqxmd.com/read/28910896/-measurement-of-morphological-parameters-of-internal-acousticmeatus-using-thin-section-ct
#9
J M Liu, D D Zhu, G H Jin, X W Zhu, L Li, G W Liu, K L Cheng, Y Q Li
Objective: This study aimed to measure the morphological parameters of the internal acoustic meatus(IAM) and its adjacent structures using temporal-bone thin-section CT(computed tomography). Methods: CT images were obtained from 50 Chinese adult patients (25 males and 25 females, 100 sides) which had no visible lesion in the petrous part of the temporal bone and inner ear, the morphological parameters of all inner ear parts were sectionally measured on the specified plane using SPSS 22.0 software for statistical analysis...
September 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/28863110/relative-location-of-fundus-meatus-acustici-interni-via-porus-acusticus-internus-in-facial-nerve-decompression
#10
Xu Liu, Haodong Wang, Kailiang Cheng, Youqiong Li
Facial neural edema is the pathophysiological base of Bell's palsy. The middle cranial fossa approach is used to relieve the oppression of facial nerve at its most narrow course in the facial canal. In this research, the authors mainly discussed the internal auditory canal segment of facial nerve, completely in the shadow of the bony structure, which is inconvenient for transmastoid decompression. Therefore, the objective was to explore the definite position of the fundus meatus acustici interni from internal acoustic pore...
September 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28857277/comparison-of-microscopic-and-endoscopic-view-of-the-internal-auditory-meatus-a-cadaveric-study
#11
Guilherme Ramina Montibeller, Philipp Hendrix, Fabian N Fries, Kurt W Becker, Joachim Oertel
The endoscope is thought to provide an improved exposure of the internal auditory meatus after retrosigmoid craniotomy for microsurgical resection of intrameatal tumors. The aim of this study is to quantify the differences in internal acoustic meatus (IAM) exposure comparing microscopic and endoscopic visualization. A retrosigmoid approach was performed on 5 cadaver heads. A millimeter gauge was introduced into the internal auditory meatus, and examinations with a surgical microscope and 0°, 30° and 70° rigid endoscopes were performed...
August 31, 2017: Clinical Anatomy
https://www.readbyqxmd.com/read/28742630/unique-case-of-hearing-recovery-after-otic-capsule-destruction-and-complete-sensorineural-hearing-loss-caused-by-langerhans-cell-histiocytosis
#12
Jennifer A Losie, Michael Yong, Frederick K Kozak, Neil K Chadha
: A 14-year-old woman presented with right-sided otologic and vestibular symptoms after presenting with hormonal disturbances earlier that year. Imaging showed a gross destruction of the temporal bone, mastoid air cells, and external acoustic meatus with invasion into the otic capsule. The patient experienced complete sensorineural hearing loss in the right ear. Biopsy diagnosed Langerhans cell histiocytosis (LCH) and the patient was treated with chemotherapy. After 1 year of treatment, the patient's hearing partially recovered and imaging showed reconstitution of the temporal bone including the otic capsule...
September 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/28631687/-acquired-atresia-and-stenosis-of-the-external-acoustic-meatus
#13
REVIEW
D S Kondratchikov, Kh M Diab, V S Korvyakov, L I Terekhina
Acquired atresia of the external acoustic meatus is a rare pathological condition characterized by obliteration of the medial part of the external acoustic canal by a soft fibrous plug. The present article presents an overview of a series of cases of acquired atresia and stenosis of the external acoustic meatus with the description of etiology, pathogenesis, and methods for the treatment of this condition. In the majority of the cases, atresia develops at the final stage of granulation external otitis with or without an accompanying dermatological pathology...
2017: Vestnik Otorinolaringologii
https://www.readbyqxmd.com/read/28506780/a-novel-approach-for-regional-anaesthesia-of-the-auricular-region-in-horses-an-anatomic-and-imaging-study
#14
Ilaria Cerasoli, Pieter Cornillie, Frank Gasthuys, Ingrid Gielen, Stijn Schauvliege
OBJECTIVE: To investigate the anatomy of the ear innervation in horses and develop a new approach for the block of the internal and external pinna and acoustic meatus. STUDY DESIGN: Prospective, descriptive, cadaveric study. ANIMALS: A total of 25 heads and necks from horse cadavers. METHODS: Phase I: anatomical dissection and dye deposition on 19 heads. With the head positioned in lateral recumbency, 10 mL methylene blue (1:1 sterile water) for the internal auricular and 2 mL for the great auricular nerve block were injected in 21 ears (seven left, 10 right and two bilaterally)...
January 11, 2017: Veterinary Anaesthesia and Analgesia
https://www.readbyqxmd.com/read/28502649/post-implantation-development-of-red-rumped-agouti-dasyprocta-leporina-linnaeus-1758
#15
Gleidson Benevides de Oliveira, Hélio Noberto de Araújo Júnior, Herson da Silva Costa, Alexandre Rodrigues Silva, Carlos Eduardo Bezerra de Moura, Hugo Alexandre de Oliveira Rocha, Maria Angélica Miglino, Moacir Franco de Oliveira
Fourteen pregnant agouti (Dasyprocta leporina Linnaeus, 1758) females at gestational ages of 30-100days and two at gestational ages of 55-100days, were studied, including 24 embryos/fetuses and two neonates (single offspring from two females). Females were euthanized and embryos/fetuses were examined, measured, and photographed. Embryos at 30days post-copulation were "C-shaped," with paddle-shaped limb buds and 10.75±0.11mm crown-rump length (CRL). In embryos at 35days post-copulation, paddle-shaped forelimbs, fin-shaped pelvic limbs, and a liver bud were evident, with 15...
May 2, 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/28459129/time-saving-and-fail-safe-dissection-method-for-vestibulocochlear-organs-in-gross-anatomy-classes
#16
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/28441806/-possible-reasons-for-cerebrospinal-fluid-gusher-in-cochlear-implantation-with-inner-ear-abnormality
#17
S P Sun, W Lu, X M Men, B Zuo, Y B Lei
Objective: To discuss the possible reasons for cerebrospinal fluid (CSF) gusher in cochlear implantation (CI) with inner ear abnormality. Method: A retrospective analysis was performed on 340 cases who underwent CI from January 2013 to December 2016 in Division of Otology, Otorhinolaryngology Hospital, the First Affiliated Hospital of Zhengzhou University. Among them, 96 cases had inner ear abnormalities. Imaging examinations were performed on these patients, and classification of inner ear malformation was done according to the results...
April 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/28436024/hair-diameter-evaluation-in-different-regions-of-the-safe-donor-area-in-asian-populations
#18
Jae H Park, Jae M Park, Na R Kim, Kotchamol Manonukul
BACKGROUND: There is little information about how hair diameter differences within the safe donor area. Thicker or thinner hair may be needed depending on the recipient area, hairline design, and surgical purpose. METHODS: Thirty-eight non-alopecic subjects (19 males and 19 females) were evaluated. The safe donor area was defined as the area contained within 28 cm from the horizontal plane of the upper border of the hair rim to the vertical line of the bilateral external acoustic meatus...
July 2017: International Journal of Dermatology
https://www.readbyqxmd.com/read/28435113/microsurgical-and-endoscopic-anatomy-for-intradural-temporal-bone-drilling-and-applications-of-the-electromagnetic-navigation-system-various-extensions-of-the-retrosigmoid-approach
#19
Ken Matsushima, Noritaka Komune, Satoshi Matsuo, Michihiro Kohno
OBJECTIVE: The use of the retrosigmoid approach has recently been expanded by several modifications, including the suprameatal, transmeatal, suprajugular, and inframeatal extensions. Intradural temporal bone drilling without damaging vital structures inside or beside the bone, such as the internal carotid artery and jugular bulb, is a key step for these extensions. This study aimed to examine the microsurgical and endoscopic anatomy of the extensions of the retrosigmoid approach and to evaluate the clinical feasibility of an electromagnetic navigation system during intradural temporal bone drilling...
July 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28397726/long-term-brain-tissue-monitoring-after-semi-brain-irradiation-in-rats-using-proton-magnetic-resonance-spectroscopy-a-preliminary-study-in-vivo
#20
Hong Chen, Yu-Shu Cheng, Zheng-Rong Zhou
BACKGROUND: In head and neck neoplasm survivors treated with brain irradiation, metabolic alterations would occur in the radiation-induced injury area. The mechanism of these metabolic alterations has not been fully understood, while the alternations could be sensitively detected by proton (1H) nuclear magnetic resonance spectroscopy (MRS). In this study, we investigated the metabolic characteristics of radiation-induced brain injury through a long-term follow-up after radiation treatment using MRS in vivo...
April 20, 2017: Chinese Medical Journal
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