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https://www.readbyqxmd.com/read/28532970/improving-resident-familiarity-with-the-translabyrinthine-approach-to-the-internal-auditory-canal
#1
Matthew M Dedmon, Brendan P O'Connell, Austin S Adams, George B Wanna, David S Haynes
OBJECTIVE: To increase otolaryngology resident experience with drilling and dissection of the internal auditory canal (IAC) via a translabyrinthine approach. STUDY DESIGN: Pilot study involving temporal bone education and drilling with completion of pre- and post-drilling surveys. METHODS: Participants observed an educational presentation on IAC anatomy and drilling, followed by manipulation of IAC nerves using a prosected cadaveric temporal bone...
April 12, 2017: American Journal of Otolaryngology
https://www.readbyqxmd.com/read/28531285/paratrigeminal-paraclival-precavernous-or-all-of-the-above-a-circumferential-anatomical-study-of-the-c3-c4-transitional-segment-of-the-internal-carotid-artery
#2
Eleonora Marcati, Norberto Andaluz, Sebastien C Froelich, Lee A Zimmer, James L Leach, Juan Carlos Fernandez-Miranda, Almaz Kurbanov, Jeffrey T Keller
BACKGROUND: Although the term paraclival carotid pervades recent skull base literature, no clear consensus exists regarding boundaries or anatomical segments. OBJECTIVE: To reconcile various internal carotid artery (ICA) nomenclatures for transcranial and endoscopic-endonasal perspectives, we reexamined the transition between lacerum (C3) and cavernous (C4) segments using a C1-C7 segments schema. In this cadaveric study, we obtained a 360°-circumferential view integrating histological, microsurgical, endoscopic, and neuroradiological analyses of this C3-C4 region and identified a distinct transitional segment...
May 21, 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/28521036/a-novel-approach-of-navigation-assisted-flexible-neuroendoscopy
#3
Jaime G Torres-Corzo, Leonardo Rangel-Castilla, Mario Alberto Islas-Aguilar, Roberto Rodríguez-Della Vecchia
BACKGROUND AND IMPORTANCE: Neuronavigation-assisted endoscopy is commonly used for skull base and intraventricular surgery. Flexible neuroendoscopy offers certain advantages over rigid endoscopy; however, a major disadvantage of the flexible endoscope has been easy disorientation in the flexed position. Neuronavigation-assisted flexible neuroendoscopy was not available until now. This is the first report of the use of navigation-assisted flexible neuroendoscopy in a patient with hydrocephalus...
May 18, 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/28520686/clinical-correlates-to-assist-with-chronic-traumatic-encephalopathy-diagnosis-insights-from-a-novel-rodent-repeat-concussion-model
#4
Gretchen M Thomsen, Ara Ko, Megan Y Harada, Annie Ma, Livia Wyss, Patricia Haro, Jean-Philippe Vit, Pablo Avalos, Navpreet K Dhillon, Noell Cho, Oksana Shelest, Eric J Ley
INTRODUCTION: Chronic traumatic encephalopathy (CTE) is a neurodegenerative disease linked to repetitive head injuries. Chronic traumatic encephalopathy symptoms include changes in mood, behavior, cognition, and motor function; however, CTE is currently diagnosed only postmortem. Using a rat model of recurrent traumatic brain injury (TBI), we demonstrate rodent deficits that predict the severity of CTE-like brain pathology. METHODS: Bilateral, closed-skull, mild TBI was administered once per week to 35 wild-type rats; eight rats received two injuries (2×TBI), 27 rats received five injuries (5×TBI), and 13 rats were sham controls...
June 2017: Journal of Trauma and Acute Care Surgery
https://www.readbyqxmd.com/read/28516966/expanded-transcanal-transpromontorial-approach-to-the-internal-auditory-canal-and-cerebellopontine-angle-a-cadaveric-study
#5
L Presutti, M Bonali, D Marchioni, G Pavesi, A Feletti, L Anschuetz, M Alicandri-Ciufelli
The aim of this paper is to describe and evaluate the feasibility of an expanded endoscopic transcanal transpromotorial approach (ExpTTA) to the internal auditory canal and the cerebellopontine angle. To this end, we performed a cadaveric dissection study in September 2015. In total, 2 heads (4 sides) were dissected focusing on anatomical landmarks and surgical feasibility. Data from dissections were reviewed and analysed for further consideration. In all 4 sides of the cadavers the procedure was feasible. In all cadavers, it was necessary to extensively drill the temporo-mandibular joint and to calibrate the external ear canal to allow adequate room to manoeuver the instruments and optics and to comfortably access the cerebellopontine angle...
June 2017: Acta Otorhinolaryngologica Italica
https://www.readbyqxmd.com/read/28512043/endoscopic-assisted-supraorbital-keyhole-approach-or-endoscopic-endonasal-approach-in-case-of-tuberculum-sellae-meningioma-which-surgical-route-should-be-favoured
#6
Stefan Linsler, Gerrit Fischer, Volodymyr Skliarenko, Axel Stadie, Joachim Oertel
OBJECTIVE: Keyhole approaches are currently under investigation for skull base tumor surgery. They are expected to have a low complication rate with the same successful resection rate compared to endoscopic endonasal procedures. In this study, the authors compare their current series of tuberculum sellae meningiomas resected via an endoscopic endonasal or microsurgical supraorbital keyhole approach. METHODS: Between 2011 and 2016, 16 patients were treated using the supraorbital keyhole procedure and 6 patients received an endoscopic endonasal procedure...
May 13, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28502655/earliest-mysticete-from-the-late-eocene-of-peru-sheds-new-light-on-the-origin-of-baleen-whales
#7
Olivier Lambert, Manuel Martínez-Cáceres, Giovanni Bianucci, Claudio Di Celma, Rodolfo Salas-Gismondi, Etienne Steurbaut, Mario Urbina, Christian de Muizon
Although combined molecular and morphological analyses point to a late middle Eocene (38-39 million years ago) origin for the clade Neoceti (Odontoceti, echolocating toothed whales plus Mysticeti, baleen whales, and relatives), the oldest known mysticete fossil dates from the latest Eocene (about 34 million years ago) of Antarctica [1, 2]. Considering that the latter is not the most stemward mysticete in recent phylogenies and that Oligocene toothed mysticetes display a broad morphological disparity most likely corresponding to contrasted ecological niches, the origin of mysticetes from a basilosaurid ancestor and its drivers are currently poorly understood [1, 3-8]...
May 22, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28502566/lateral-skull-base-chondroblastoma-resected-with-facial-nerve-posterior-transposition
#8
J Adnot, O Langlois, E Tollard, M Crahes, I Auquit-Auckbur, J-P Marie
INTRODUCTION: Chondroblastoma is a rare tumor that can involve the temporal bone. Because it is a benign tumor, functional surgery must be proposed. We report a case of a patient with a massive chondroblastoma operated on with preservation of the facial nerve, and description of the surgical technique. CASE PRESENTATION: A 37-year-old man presented with a 9-month history of a growing left pre-auricular mass and hearing loss. Neuroimaging showed an osteolytic mass invading the temporal bone and temporomandibular joint...
May 11, 2017: Neuro-Chirurgie
https://www.readbyqxmd.com/read/28498973/chordoma-occurs-in-young-children-with-tuberous-sclerosis
#9
Nathan A Dahl, Timothy Luebbert, Michele Loi, Ilana Neuberger, Michael H Handler, Bette Kay Kleinschmidt-DeMasters, Jean M Mulcahy Levy
Chordomas are rare bony neoplasms usually unassociated with a familial tumor predisposition syndrome. The peak incidence of this midline axial skeletal tumor is in adulthood but when very young children are affected, consideration should be given to occurrence within the tuberous sclerosis (TS) complex, especially when presenting in neonates <3 months of age. To call attention to this association, we present a brachyury-immunopositive chordoma occurring in the skull base of a 2-month-old male infant who was later realized to have metastases to the subcutaneous tissues and lungs, as well as rhabdomyoma of the heart and renal cysts/angiomyolipomas, that is, characteristic features of the TS complex...
June 1, 2017: Journal of Neuropathology and Experimental Neurology
https://www.readbyqxmd.com/read/28498268/transcanal-endoscopic-ear-surgery-for-excision-of-a-facial-nerve-venous-malformation-with-interposition-nerve-grafting-a-case-report
#10
Cameron C Wick, Mark Sakai, Timothy E Richardson, Brandon Isaacson
OBJECTIVE: To illustrate a novel approach for the surgical management of a venous malformation of the facial nerve, including interposition nerve grafting, via an exclusively transcanal endoscopic ear surgery (TEES) approach. PATIENT: Thirty nine-year-old woman with a preoperative House-Brackmann (HB) grade IV facial paresis secondary to a facial nerve tumor. INTERVENTION(S): Surgical excision and interposition nerve graft via a transcanal endoscopic approach...
May 11, 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/28490402/international-frontal-sinus-anatomy-classification-and-anatomic-predictors-of-low-lying-anterior-ethmoidal-arteries
#11
Phayvanh P Sjogren, Rajendra Waghela, Shaelene Ashby, Richard H Wiggins, Richard R Orlandi, Jeremiah A Alt
BACKGROUND: The International Frontal Sinus Anatomy Classification (IFAC) was introduced to more accurately characterize ethmoid and frontal sinus pneumatization patterns. The prevalence of IFAC cells and their anatomic associations have not been described. OBJECTIVE: The goal was to examine the prevalence of IFAC cells and determine radiologic features associated with a low-lying anterior ethmoidal artery (LAEA). METHODS: Imaging of adult patients who underwent computed tomographies from January 2015 to March 2016 were retrospectively reviewed by using the IFAC classification...
May 1, 2017: American Journal of Rhinology & Allergy
https://www.readbyqxmd.com/read/28483148/treatment-of-locally-advanced-parotid-malignancies-with-parotidectomy-and-temporal-bone-resection
#12
James R Martin, Peter Filip, Eric J Thorpe, John P Leonetti
PURPOSE: In this study we review our institution's experience and outcomes with temporal bone resection and parotidectomy in the treatment of advanced parotid malignancies. METHODS: Patients undergoing lateral temporal bone resection and parotidectomy from 2007-2013 were identified in the EPIC electronic medical record. Primary tumor location, staging, surgical procedure, and patient demographic and outcome data were collected retrospectively. RESULTS: Fifteen patients underwent combined temporal bone resection and parotidectomy for parotid malignancy...
March 31, 2017: American Journal of Otolaryngology
https://www.readbyqxmd.com/read/28483146/skull-base-osteomyelitis-secondary-to-malignant-otitis-externa-mimicking-advanced-nasopharyngeal-cancer-mr-imaging-features-at-initial-presentation
#13
J P N Goh, A Karandikar, S C Loke, T Y Tan
PURPOSE: Skull base osteomyelitis (SBOM) is an inflammatory process which often arises from malignant otitis externa (MOE); the diffuse skull base and adjacent soft tissue involvement may be mistaken at initial imaging for advanced nasopharyngeal carcinoma (NPC), especially if there is no prior knowledge of MOE, direct spread from the sphenoid sinus or in atypical presentations of MOE. This study aims to evaluate imaging features on MR that may differentiate SBOM from NPC. MATERIALS AND METHODS: The MR examinations of 26 patients diagnosed with SBOM between January 1996 and January 2013 were retrospectively reviewed...
April 26, 2017: American Journal of Otolaryngology
https://www.readbyqxmd.com/read/28480872/estimation-of-arterial-input-by-a-noninvasive-image-derived-method-in-brain-h2-15-o-pet-study-confirmation-of-arterial-location-using-mr-angiography
#14
Muhammad Muinul Islam, Tetsuya Tsujikawa, Tetsuya Mori, Yasushi Kiyono, Hidehiko Okazawa
A noninvasive method to estimate input function directly from H2(15)O brain PET data for measurement of cerebral blood flow (CBF) was proposed in this study. The image derived input function (IDIF) method extracted the time-activity curves (TAC) of the major cerebral arteries at the skull base from the dynamic PET data. The extracted primordial IDIF showed almost the same radioactivity as the arterial input function (AIF) from sampled blood at the plateau part in the later phase, but significantly lower radioactivity in the initial arterial phase compared with that of AIF-TAC...
May 8, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28476577/utility-of-quantitative-micro-computed-tomographic-analysis-in-zebrafish-to-define-gene-function-during-skeletogenesis
#15
Julia F Charles, Meera Sury, Kelly Tsang, Katia Urso, Katrin Henke, Yue Huang, Ruby Russell, Jeffrey Duryea, Matthew P Harris
The zebrafish is a powerful experimental model to investigate the genetic and morphologic basis of vertebrate development. Analysis of skeletogenesis in this fish is challenging as a result of the small size of the developing and adult zebrafish. Many of the bones of small fishes such as the zebrafish and medaka are quite thin, precluding many standard assays of bone quality and morphometrics commonly used on bones of larger animals. Microcomputed tomography (microCT) is a common imaging technique used for detailed analysis of the skeleton of the zebrafish and determination of mutant phenotypes...
May 2, 2017: Bone
https://www.readbyqxmd.com/read/28468205/a-rare-concha-variation-coronal-cleft
#16
Serap Yucel, Hediye Pinar Gunbey, Emre Gunbey, Asli Tanrivermis Sayit, Kerim Aslan
Nasal turbinates are embryologically derived from a series of outgrowths from the foetal lateral nasal wall. These outgrowths form a series of ridges, referred to as "ethmoturbinals" and have several vital functions. Several different turbinate variations have been reported so far. The authors presented 3 patients of coronal clefted concha who were diagnosed with magnetic resonance imaging. Computed tomography scans and nasal endoscopic examinations are also performed subsequently. These patients are the first coronal clefted concha cases in the literature and also the first radiological study defining concha cleft...
May 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28451020/foramen-magnum-meningioma-s-management-the-experience-of-the-department-of-neurosurgery-in-marrakesh
#17
Farouk Hajhouji, Mohammed Lmejjati, Khalid Aniba, Mehdi Laghmari, Houssine Ghannane, Said Ait Benali
Our study is a retrospective analysis of the clinical data, surgical outcomes, histological finding and prognosis of foramen magnum meningiomas through a serie of 8 cases operated at the department of neurosurgery at Mohammed VI medical university hospital, Marrakesh. From January 2002 to December 2015. There were 3 male and 5 female patients (mean age, 46.75 years). Cervico-occipital pain (100%) and motor deficit (100%) were the most common presenting symptoms. MRI was the most appropriate diagnostic tool in visualizing tumors of this region...
2017: Pan African Medical Journal
https://www.readbyqxmd.com/read/28418817/virtual-mapping-of-the-frontal-recess-guiding-safe-and-efficient-frontal-sinus-surgery
#18
Neil S Patel, Amy C Dearking, Erin K O'Brien, John F Pallanch
Objective To define relationships between the frontal sinus opening, ostia of other frontal recess cells, and endoscopic landmarks and to develop a clinically useful framework to guide frontal sinus surgery. Study Design Retrospective review. Setting Tertiary care academic referral center. Methods Adult patients with computed tomography (CT) without sinonasal pathology were included. Virtual endoscopy (using OsiriX) and corresponding CT reconstructions were used to identify all visible ostia in the frontal recess and characterize their positions in spaces between the uncinate/agger nasi (U), bulla ethmoidalis (EB), and middle turbinate (MT)...
April 1, 2017: Otolaryngology—Head and Neck Surgery
https://www.readbyqxmd.com/read/28413719/intra-specific-variation-and-allometry-of-the-skull-of-late-cretaceous-side-necked-turtle-bauruemys-elegans-pleurodira-podocnemididae-and-how-to-deal-with-morphometric-data-in-fossil-vertebrates
#19
Thiago F Mariani, Pedro S R Romano
BACKGROUND: Previous quantitative studies on Bauruemys elegans (Suárez, 1969) shell variation, as well as the taphonomic interpretation of its type locality, have suggested that all specimens collected in this locality may have belonged to the same population. We rely on this hypothesis in a morphometric study of the skull. Also, we tentatively assessed the eating preference habits differentiation that might be explained as due to ontogenetic changes. METHODS: We carried out an ANOVA testing 29 linear measurements from 21 skulls of B...
2017: PeerJ
https://www.readbyqxmd.com/read/28401031/sella-turcica-measurements-on-lateral-cephalograms-of-patients-with-neurofibromatosis-type-1
#20
Reinhard E Friedrich, Johanna Baumann, Anna Suling, Hannah T Scheuer, Hanna A Scheuer
The aim of this study was to measure line segments and areas of sella turcica on lateral cephalograms with respect to the clinical diagnosis of facial phenotype of patients with neurofibromatosis type 1 (NF1). Special attention was given to correlate the measured values with certain tumour types that are typical for this disease. Material and methods: Lateral cephalograms of 194 individuals were investigated. Patients with NF1 were further divided according to the detection and topography of facial plexiform neurofibromas (PNF) taking into account the distribution pattern of the trigeminal nerve...
2017: GMS Interdisciplinary Plastic and Reconstructive Surgery DGPW
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