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Posterior Skull Base

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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
#1
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/28527009/the-simpson-grading-in-meningioma-surgery-does-the-tumor-location-influence-the-prognostic-value
#2
Kira Marie Voß, Dorothee Cäcilia Spille, Cristina Sauerland, Eric Suero Molina, Caroline Brokinkel, Werner Paulus, Walter Stummer, Markus Holling, Astrid Jeibmann, Benjamin Brokinkel
In meningiomas, location-specific differences of the prognostic value of the Simpson classification are sparsely investigated but can influence strategy of surgery. We therefore compared the prognostic value of the Simpson classification in different tumor locations. Progression was compared with Simpson grade in 826 meningioma patients (median age 58 years, female:male ratio 2.4) in location-specific uni- and multivariate analyses. Simpson grade strongly correlated with tumor location (p < .001). Within a median follow-up of 50 months, recurrence was observed in 107 of 803 patients (13%)...
May 19, 2017: Journal of Neuro-oncology
https://www.readbyqxmd.com/read/28511365/morphological-and-morphometric-analysis-of-hypoglossal-canal-in-north-indian-dry-skulls-and-it-s-significance-in-cranial-base-surgeries
#3
Shalini Kumar, Ranjana Verma, Arpita Mahajan Rai, Raj D Mehra
INTRODUCTION: Hypoglossal Canal (HC) is a paired bony passage which is situated above the Occipital Condyle (OC) and transmits hypoglossal nerve and blood vessels. Studies on the osteotic variations of HC has been a field of considerable interest to research workers especially because of its clinical, radiological and surgical significance. AIM: The aim of the present study was to analyze the morphological and morphometric features of HC and its topographical relationship with OC...
March 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28502566/lateral-skull-base-chondroblastoma-resected-with-facial-nerve-posterior-transposition
#4
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/28490402/international-frontal-sinus-anatomy-classification-and-anatomic-predictors-of-low-lying-anterior-ethmoidal-arteries
#5
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/28458825/a-locally-destructive-completely-asymptomatic-c1-root-schwannoma-with-base-of-skull-invasion-a-case-report
#6
David Pisani, Christian Camenzuli, Josephine Psaila, Snežana Božanić, Jean Calleja-Agius
Patients with C1 nerve root schwannomas usually present with signs relating to nerve root compression. However, asymptomatic presentations have never been reported. A healthy, 37-year-old female was referred in view of a slow-growing lump in the left posterosuperior aspect of the neck. The lump was asymptomatic and neurological examination was normal. Magnetic resonance imaging revealed a left C1 nerve root tumour, extending around the C1 vertebra and compressing the thecal sac. The tumour had invaded the basiocciput and was impinging on the left cerebellar hemispheric dura...
February 2017: Journal of Surgical Case Reports
https://www.readbyqxmd.com/read/28457276/nonsurgical-correction-using-miniscrew-assisted-vertical-control-of-a%C3%A2-severe-high-angle-with-mandibular-retrusion-and-gummy-smile-in-an-adult
#7
Xue-Dong Wang, Jie-Ni Zhang, Da-Wei Liu, Fei-Fei Lei, Wei-Tao Liu, Yang Song, Yan-Heng Zhou
Orthodontic treatment in adult patients with a skeletal discrepancy can be challenging. In this case report, we achieved both sagittal and vertical control by combining the classic sliding mechanics straight-wire technique with miniscrew anchorage. We treated a 21-year-old Chinese woman with a severe high mandibular plane angle, a retrusive chin, and a gummy smile. Her diagnosis included a skeletal Class II skull base with a mild anterior open bite, a protrusive maxilla, and a backwardly rotated mandible. This case underscores the importance of anchorage control in both the sagittal and vertical directions...
May 2017: American Journal of Orthodontics and Dentofacial Orthopedics
https://www.readbyqxmd.com/read/28451020/foramen-magnum-meningioma-s-management-the-experience-of-the-department-of-neurosurgery-in-marrakesh
#8
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/28447154/radiological-and-clinical-interpretation-of-the-patients-with-csf-leaks-developed-during-or-after-endoscopic-sinus-surgery
#9
Muaid I Aziz Baban, Mokarbesh Hadi, Stefania Gallo, Jacopo Zocchi, Mario Turri-Zanoni, Paolo Castelnuovo
Cerebrospinal fluid (CSF) leaks associated with endoscopic sinus surgery (ESS) are a rare complication related to anatomical and technical factors. The anatomical variations at skull base level are imperative to be detected preoperatively by CT scan to avoid this complication. Identifying the factors playing a role in the incidence of the CSF leaks during and after ESS and the common leak sites. A retrospective review of 24 patients presented with incidental CSF leaks, gathered from 1999 to 2016 was performed...
April 26, 2017: European Archives of Oto-rhino-laryngology
https://www.readbyqxmd.com/read/28424012/internal-carotid-artery-agenesis-a-case-report-and-review-of-literature
#10
REVIEW
Shuo Li, Kusum Hooda, Nishant Gupta, Yogesh Kumar
Congenital agenesis of the internal carotid artery is a very rare anomaly. Intracranial circulation in the involved internal carotid artery territory is maintained by collateral circulation from the contralateral internal carotid artery through the anterior communicating artery and from the vertebrobasilar system through the posterior communicating artery. Usually, patients with internal carotid artery agenesis are asymptomatic due to collateral circulation, but they may present with headache, seizures, or transient ischemic attack...
April 2017: Neuroradiology Journal
https://www.readbyqxmd.com/read/28422806/improvement-of-image-quality-in-unenhanced-dual-layer-ct-of-the-head-using-virtual-monoenergetic-images-compared-with-polyenergetic-single-energy-ct
#11
Victor Neuhaus, Nuran Abdullayev, Nils Große Hokamp, Gregor Pahn, Christoph Kabbasch, Anastasios Mpotsaris, David Maintz, Jan Borggrefe
OBJECTIVES: The aims of this study were to compare virtual monoenergetic images and polyenergetic images reconstructed from unenhanced dual-layer detector computed tomography (DLCT) of the head and to determine kiloelectron volt levels that optimize image quality, particularly the gray-white matter contrast, and reduce beam hardening artifacts caused by the skull. MATERIALS AND METHODS: Institutional review board approval was obtained. Forty patients that received DLCT were included in this retrospective study; of these patients, 22 were women and 18 were men...
April 19, 2017: Investigative Radiology
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
#12
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/28383737/increases-in-cranial-volume-with-posterior-cranial-vault-distraction-in-31-consecutive-cases
#13
Niina Salokorpi, Ville Vuollo, Juha-Jaakko Sinikumpu, Leonid Satanin, Heleia Nestal Zibo, Leena P Ylikontiola, Pertti Pirttiniemi, George K Sándor, Willy Serlo
BACKGROUND: Posterior cranial vault distraction (PCVD) is a technique widely used in surgical treatment of craniosynostosis when cranial expansion is required. It has proven to be safe and to allow a significant increase of intracranial volume. OBJECTIVE: To evaluate increases in intracranial volume as a result of PCVD performed in Oulu Craniofacial center using 2 different methods based on 3-dimensional (3-D) photogrammetric imaging or plain skull radiographs. METHODS: All children less than 16 yr of age who were treated by PCVD (n = 31) from 2009 to 2015 at the Oulu Craniofacial Center were included...
April 5, 2017: Neurosurgery
https://www.readbyqxmd.com/read/28377283/the-combined-transpetrosal-approach-anatomic-study-and-literature-review
#14
REVIEW
M Burhan Janjua, James P Caruso, Jeffrey P Greenfield, Mark M Souweidane, Theodore H Schwartz
The combined petrosal approach is an essential technique for the skull base neurosurgeon. In this manuscript, the authors provide a brief history of the development of this approach, technical instruction with consideration of important landmarks, and a literature review of the broad range of clinical applications for this approach. The combined petrosal approach was performed bilaterally in 6 cadaveric injected specimens. The relationship of middle and posterior fossa dura, venous sinuses, cranial nerves (CNs), and the vascular anatomy were studied...
April 1, 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/28328602/intracranial-anatomic-landmarks-for-endoscopic-endonasal-transcribriform-approach-to-anterior-skull-base
#15
Pinghua Wu, Huikun Zeng, Ying Guan, Ligen Mo, Danke Su
OBJECTIVES: To help surgeons locating anatomic landmarks when performing endoscopic endonasal transcribriform approach to anterior skull base. METHODS: High-resolution axial computed tomography (CT) images at thickness of 0.6 mm, and reconstructed 0.41-mm thick gapless sagittal and coronal CT images were taken from 123 subjects. Using mimics software, first located elementary points and line: nasal spine, midpoint of posterior hard palate and the line between them; then located measured points right/left posterior and anterior points; measured distances between measured points and from measured points to nasal spine and angles between lines connecting measured points to nasal spine and the basic line...
March 21, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28321387/free-mucosal-graft-reconstruction-of-the-septum-after-nasoseptal-flap-harvest-a-novel-technique-using-a-posterior-septal-free-mucosal-graft
#16
Frederick Yoo, Edward C Kuan, Marvin Bergsneider, Marilene B Wang
Objectives The nasoseptal flap (NSF) has become the workhorse for reconstruction in endoscopic endonasal skull-base surgery. The NSF, though useful in reconstruction, may lead to significant donor site morbidity. Published techniques to reduce the donor site morbidity, free mucosal grafts, and septal rotational flaps have shown to reduce crusting and remucosalization times. We present a novel technique utilizing posterior septal mucosa as a free mucosal graft for reconstruction of the anterior septal donor site...
April 2017: Journal of Neurological Surgery. Part B, Skull Base
https://www.readbyqxmd.com/read/28318880/highly-conformal-craniospinal-radiotherapy-techniques-can-underdose-the-cranial-clinical-target-volume-if-leptomeningeal-extension-through-skull-base-exit-foramina-is-not-contoured
#17
D J Noble, T Ajithkumar, J Lambert, I Gleeson, M V Williams, S J Jefferies
AIMS: Craniospinal irradiation (CSI) remains a crucial treatment for patients with medulloblastoma. There is uncertainty about how to manage meningeal surfaces and cerebrospinal fluid (CSF) that follows cranial nerves exiting skull base foramina. The purpose of this study was to assess plan quality and dose coverage of posterior cranial fossa foramina with both photon and proton therapy. MATERIALS AND METHODS: We analysed the radiotherapy plans of seven patients treated with CSI for medulloblastoma and primitive neuro-ectodermal tumours and three with ependymoma (total n = 10)...
March 15, 2017: Clinical Oncology: a Journal of the Royal College of Radiologists
https://www.readbyqxmd.com/read/28299444/the-ethmoidal-arteries-a-cadaveric-study-based-on-cone-beam-computed-tomography-and-endoscopic-dissection
#18
Marco Ferrari, Luca Pianta, Andrea Borghesi, Alberto Schreiber, Marco Ravanelli, Davide Mattavelli, Vittorio Rampinelli, Francesco Belotti, Luigi Fabrizio Rodella, Roberto Maroldi, Piero Nicolai
PURPOSE: To describe the anatomical variability of the ethmoidal arteries (EAs). To evaluate the reliability of cone beam computed tomography (CBCT) in preoperative assessment of EAs. METHODS: Fourteen cadaver heads underwent CBCT and endoscopic dissection. The following anatomical features were evaluated for anterior (AEA), middle (MEA), and posterior (PEA) EAs: presence, cranio-caudal position, antero-posterior position, and dehiscence of the bony canal. Accuracy of radiological assessment was calculated...
March 15, 2017: Surgical and Radiologic Anatomy: SRA
https://www.readbyqxmd.com/read/28283722/fanconi-anemia-correlating-central-nervous-system-malformations-and-genetic-complementation-groups
#19
Benjamin A Johnson-Tesch, Rakhee S Gawande, Lei Zhang, Margaret L MacMillan, David R Nascene
BACKGROUND: Congenital central nervous system abnormalities in children with Fanconi anemia are poorly characterized, especially with regard to specific genetic complementation groups. OBJECTIVE: To characterize the impact of genetic complementation groups on central nervous system anatomy. MATERIALS AND METHODS: Through chart review we identified 36 patients with Fanconi anemia with available brain MRIs at the University of Minnesota (average age, 11...
March 10, 2017: Pediatric Radiology
https://www.readbyqxmd.com/read/28261802/ancestral-variation-in-orbital-rim-shape-a-three-dimensional-pilot-study
#20
Katie M Rubin, Valerie B DeLeon
Traditional nonmetric methods of ancestry assessment posit orbital rim shape varies among ancestral groups. This pilot study uses morphometric analysis of 3D orbital variation to test discrimination among individuals of primarily European, African, and Asian ancestry. Although the size and nature of the sample analyzed limit inferences for other samples, principal components analysis suggests ancestry has a significant effect on rim shape (p = 2.93e-04). European orbits display more marked folding of the orbit in the sagittal plane than either African or Asian orbits, while the lateral margin of African orbits lies further posterior relative to the medial margin when compared to Asian orbits...
March 6, 2017: Journal of Forensic Sciences
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