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Posterior Skull Base

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https://www.readbyqxmd.com/read/29778601/diagnosis-classification-and-management-of-fourth-ventriculomegaly-in-adults-report-of-9-cases-and-literature-review
#1
Kaveh Barami, Indro Chakrabarti, James Silverthorn, Jeremy Ciporen, Paul T Akins
OBJECTIVE: An enlarged fourth ventricle otherwise known as fourth ventriculomegaly (4th VM) has been previously reported in the pediatric population yet literature on adults is scant. We report our experience with 4th VM in adults over an 11 year period and review the literature. MATERIAL/METHODS: retrospective chart review of adult patients with the diagnosis of 4th VM admitted to the ICU in a tertiary care center RESULTS: 9 patients were identified with 4th VM...
May 17, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29763505/influence-of-alveolar-bone-defects-on-the-stress-distribution-in-quad-zygomatic-implant-supported-maxillary-prosthesis
#2
Yuanyuan Duan, Ravi Chandran, Denise Cherry
PURPOSE: The purpose of this study was to create three-dimensional composite models of quad zygomatic implant-supported maxillary prostheses with a variety of alveolar bone defects around implant sites, and to investigate the stress distribution in the surrounding bone using the finite element analysis (FEA) method. MATERIALS AND METHODS: Three-dimensional models of titanium zygomatic implants, maxillary prostheses, and human skulls were created and assembled using Mimics based on microcomputed tomography and cone beam computed tomography images...
May 2018: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/29762326/temporal-progression-of-craniofacial-dysmorphology-in-unilateral-coronal-synostosis-a-mechanistic-hypothesis
#3
Kirun Baweja, Alexander H Sun, Rajendra Sawh-Martinez, John A Persing
AIM: This study chronicles skull base and face development in nonsyndromic unilateral coronal synostosis (UCS) during infancy, to characterize the mechanistic progression of facial dysmorphology. METHODS: Computed tomography scans from 51 subjects were reviewed (26 UCS, 25 controls) and data were reconstructed. Patients were stratified into 5 age groups. A series of measurements were taken from the reconstructions. RESULTS: All patients had a unilaterally fused coronal suture at the time of analysis...
May 14, 2018: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/29761256/quantitative-analysis-of-cranial-orbital-changes-in-infants-with-anterior-synostotic-plagiocephaly
#4
Rosalinda Calandrelli, Fabio Pilato, Luca Massimi, Marco Panfili, Concezio Di Rocco, Cesare Colosimo
PURPOSE: The effects of premature fusion of one coronal suture cause skull and orbital alterations in term of side-to-side asymmetry. This study aimed to quantify the cranio-orbital complex changes related to the severity of skull base dysmorphology in patients with unicoronal synostosis. METHODS: Twenty-four infants affected by unicoronal synostosis were subdivided in three subgroups according to the severity of skull base deformity and their high-resolution CT images were quantitatively analyzed (groups IIa, IIb, III)...
May 14, 2018: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/29760919/anatomy-of-the-posterior-and-middle-ethmoidal-arteries-via-computed-tomography
#5
Hiroki Yamamoto, Kazuhiro Nomura, Hiroshi Hidaka, Yukio Katori, Naohiro Yoshida
Objective: The aim of this study is to investigate the anatomy of the posterior and middle ethmoidal arteries from the viewpoint of an endoscopic sinus surgeon. Methods: Based on 100 computed tomography images, the anatomical position of the posterior ethmoidal artery in relation to the posterior ethmoid cells was classified into five types. The presence of the posterior and middle ethmoidal arteries, their distance from the skull base, and their length exposed in the ethmoid cells were measured...
2018: SAGE Open Medicine
https://www.readbyqxmd.com/read/29753077/endoscopic-endonasal-reconstruction-of-anterior-skull-base-defects-what-factors-really-affect-the-outcomes
#6
Mario Turri-Zanoni, Jacopo Zocchi, Alessia Lambertoni, Marta Giovannardi, Apostolos Karligkiotis, Paolo Battaglia, Davide Locatelli, Paolo Castelnuovo
OBJECTIVES: Endoscopic endonasal surgery has evolved considerably over the last few decades, requiring comparable advances in reconstructive techniques. The objectives of this study were to retrospectively review the outcomes of endoscopic anterior skull base (ASB) reconstruction and to analyze factors that might be associated with failures. METHODS: Data from patients who underwent endoscopic endonasal ASB reconstruction in a single Institution between 1998 and 2017 were collected...
May 9, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29751190/preoperative-embolization-of-skull-base-meningiomas-outcomes-in-the-onyx-era
#7
Colin J Przybylowski, Jacob F Baranoski, Alfred P See, Bruno C Flores, Rami O Almefty, Dale Ding, Kristina M Chapple, Nader Sanai, Andrew F Ducruet, Felipe C Albuquerque
OBJECTIVE: Preoperative embolization may facilitate skull base meningioma resection, but its safety and efficacy in the Onyx era have not been investigated. In this retrospective cohort study, we evaluated the outcomes of preoperative embolization of skull base meningiomas using Onyx as the primary embolysate. METHODS: We queried an endovascular database for patients with skull base meningiomas who underwent preoperative embolization at our institution in 2007-2017...
May 8, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29737743/-clinical-experience-of-resection-for-nasal-skull-base-tumors-by-microsurgical-assisted-technique
#8
Xin Jie Zhu, Zhi Bin Chen
OBJECTIVES: To investigate the application of the microsurgical treatment in nasal skull-base tumors resection. METHODS: In a retrospective study, totally 15 cases with tumors in the nasal skull-base received microsurgical-assisted treatment in our department from February 2012 to June 2017 were analysed. Lateral rhinotomy approach was carried out in 11 patients and posterior wall of the maxillary sinus approach in 4 patients. RESULTS: Tumors of all cases were completely resected under the microscope...
March 2018: Journal of Clinical Otorhinolaryngology, Head, and Neck Surgery
https://www.readbyqxmd.com/read/29726777/surgical-outcomes-after-reoperation-for-recurrent-skull-base-meningiomas
#9
Stephen T Magill, David S Lee, Adam J Yen, Calixto-Hope G Lucas, David R Raleigh, Manish K Aghi, Philip V Theodosopoulos, Michael W McDermott
OBJECTIVE Skull base meningiomas are surgically challenging tumors due to the intricate skull base anatomy and the proximity of cranial nerves and critical cerebral vasculature. Many studies have reported outcomes after primary resection of skull base meningiomas; however, little is known about outcomes after reoperation for recurrent skull base meningiomas. Since reoperation is one treatment option for patients with recurrent meningioma, the authors sought to define the risk profile for reoperation of skull base meningiomas...
May 4, 2018: Journal of Neurosurgery
https://www.readbyqxmd.com/read/29712501/the-feasibility-and-accuracy-of-ultrasound-assessment-in-the-labor-room
#10
S Usman, M Wilkinson, H Barton, C C Lees
OBJECTIVE: Vaginal examination is widely used to assess the progress of labor; however, it is subjective and poorly reproducible. We aim to assess the feasibility and accuracy of transabdominal and transperineal ultrasound compared to vaginal examination in the assessment of labor and its progress. METHODS: Women were recruited as they presented for assessment of labor to a tertiary inner city maternity service. Paired vaginal and ultrasound assessments were performed in 192 women at 24-42 weeks...
April 30, 2018: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/29701550/brain-invasion-and-the-risk-of-seizures-in-patients-with-meningioma
#11
Katharina Hess, Dorothee Cäcilia Spille, Alborz Adeli, Peter B Sporns, Caroline Brokinkel, Oliver Grauer, Christian Mawrin, Walter Stummer, Werner Paulus, Benjamin Brokinkel
OBJECTIVE Identification of risk factors for perioperative epilepsy remains crucial in the care of patients with meningioma. Moreover, associations of brain invasion with clinical and radiological variables have been largely unexplored. The authors hypothesized that invasion of the cortex and subsequent increased edema facilitate seizures, and they compared radiological data and perioperative seizures in patients with brain-invasive or noninvasive meningioma. METHODS Correlations of brain invasion with tumor and edema volumes and preoperative and postoperative seizures were analyzed in univariate and multivariate analyses...
April 27, 2018: Journal of Neurosurgery
https://www.readbyqxmd.com/read/29671688/a-guide-to-identification-and-selection-of-axial-planes-in-magnetic-resonance-imaging-of-the-brain
#12
Shoichiro Otake, Toshiaki Taoka, Masayuki Maeda, William Tc Yuh
For brain magnetic resonance (MR) examination, three-dimensional imaging is commonly performed. Radiologists need to know the appropriate imaging angle for viewing. We present six imaging angles for the axial images. Each angle is determined by the reference line. The landmarks on the midsagittal MR image to determine the angle of the reference lines are as follows: the supraorbito-meatal line (the center of the mammillary body and the fastigium of the fourth ventricle), the orbito-meatal (OM) line (the center of the mammillary body and the most posterior point of the cerebellar tentorium), the Talairach anterior commissure (AC)-posterior commissure (PC) line (the superior edge of the AC and the inferior edge of the PC), the Schaltenbrand AC-PC line (the center of the AC and the center of the PC), the subcallosal line (the inferior border of the genu and the inferior border of the splenium of the corpus callosum), Reid's baseline (the center of the pituitary gland and the most posterior point of the cerebellar tentorium) and the brainstem vertical line (the line perpendicular to the posterior border of the brainstem)...
January 1, 2018: Neuroradiology Journal
https://www.readbyqxmd.com/read/29660990/novel-radiographic-assessment-of-the-cribriform-plate
#13
Kimia G Ganjaei, Zachary M Soler, Elliott D Mappus, Robert J Taylor, Mitchell L Worley, Jennifer K Mulligan, Jose L Mattos, Nicholas R Rowan, Guilherme J M Garcia, Judy R Dubno, Mark A Eckert, Lois J Matthews, Rodney J Schlosser
Background The cribriform plate (CP) is a common site of spontaneous cerebrospinal fluid (SCSF) leaks. Radiographic assessment of the anterior and lateral skull base has shown thinner bone in patients with SCSFs; however, prior assessment of the CP has required postmortem cadaver dissection. Objective To develop novel radiographic techniques to assess the anatomy of the CP. Methods Computed tomography (CT) scans were performed on cadaveric specimens. Bone density and anatomy of a predefined volume of interest of the posterior CP were assessed by two independent reviewers...
January 1, 2018: American Journal of Rhinology & Allergy
https://www.readbyqxmd.com/read/29657910/anterolateral-triangle-a-cadaveric-study-with-neurosurgical-significance
#14
Andre Granger, Ornella Bricoune, Tina Rajnauth, David Kimball, Heather Kimball, R Shane Tubbs, Marios Loukas
The anterolateral triangle is one of 10 surgical triangles of the cavernous sinus and serves as an important anatomic landmark for the skull base surgeon. There are few studies in the English literature that have precisely defined and measured the borders of the anterolateral triangle and little agreement has been made regarding the nomenclature within the English literature. A total of 12 midsagittally hemisected adult human cadaveric head halves were dissected to expose the anterolateral triangle. The triangle was defined and measurements of the anterior, posterior, and lateral borders were taken...
February 12, 2018: Curēus
https://www.readbyqxmd.com/read/29624668/evolution-of-cranial-telescoping-in-echolocating-whales-cetacea-odontoceti
#15
Morgan Churchill, Jonathan H Geisler, Brian L Beatty, Anjali Goswami
Odontocete (echolocating whale) skulls exhibit extreme posterior displacement and overlapping of facial bones, here referred to as retrograde cranial telescoping. To examine retrograde cranial telescoping across 40 million years of whale evolution, we collected 3D scans of whale skulls spanning odontocete evolution. We used a sliding semilandmark morphometric approach with Procrustes superimposition and PCA to capture and describe the morphological variation present in the facial region, followed by Ancestral Character State Reconstruction (ACSR) and evolutionary model fitting on significant components to determine how retrograde cranial telescoping evolved...
April 6, 2018: Evolution; International Journal of Organic Evolution
https://www.readbyqxmd.com/read/29619106/an-analysis-of-anatomic-variations-of-the-sphenoid-sinus-and-its-relationship-to-the-internal-carotid-artery
#16
Myrian Marajó Dal Secchi, Ricardo Landini Lutaif Dolci, Reginaldo Teixeira, Paulo Roberto Lazarini
Introduction  The sphenoid sinus (SS) has a high variability; its anatomical relations and variations must be well understood prior to the expanded endoscopic surgery (EES) at the skull base via the endonasal transsphenoidal approach. A feared complication is injury to the internal carotid artery (ICA). Objective  To evaluate the anatomic variations of the SS and its relationship to the ICA using computed tomography (CT). Methods  Cross-sectional retrospective study. Analysis of 90 patients' CT scans on axial, coronal and sagittal planes with 1 mm slices, evaluating lateral and posterior extensions of pneumatization of the SS, deviation of the sphenoid septum, presence of septations and their relationship to the parasellar and paraclival segments of the internal carotid artery (psICA and pcICA, respectively)...
April 2018: International Archives of Otorhinolaryngology
https://www.readbyqxmd.com/read/29598947/locoregional-extension-and-patterns-of-failure-for-nasopharyngeal-carcinoma-with-intracranial-extension
#17
Caineng Cao, Feng Jiang, Qifeng Jin, Ting Jin, Shuang Huang, Qiaoying Hu, Yuanyuan Chen, Yongfeng Piao, Yonghong Hua, Xinglai Feng, Xiaozhong Chen
OBJECTIVE: To evaluate the locoregional extension and patterns of failure for nasopharyngeal carcinoma (NPC) with intracranial extension to improve clinical target volume (CTV) delineation. PATIENTS AND METHODS: A total of 205 NPC patients with intracranial extension by magnetic resonance imaging (MRI) were retrospectively reviewed. RESULTS: According to the cumulative incidence rates of tumor invasion, we initially classified anatomic sites surrounding the nasopharynx into three risk grades: high risk (≥35%), medium risk (≥10-35%), and low risk (<10%)...
April 2018: Oral Oncology
https://www.readbyqxmd.com/read/29594536/use-of-black-bone-mri-in-the-diagnosis-of-the-patients-with-posterior-plagiocephaly
#18
Linda Kuusela, Ada Hukki, Nina Brandstack, Taina Autti, Junnu Leikola, Anne Saarikko
PURPOSE: Ionising radiation exposure is especially harmful to brain development. The purpose of this study was to evaluate whether black-bone (BB) magnetic resonance imaging (MRI), a non-ionising imaging method, offers an alternative to ionising imaging methods such as computed tomography (CT) in the examination of cranial deformities. METHODS: From 2012 to 2014, a total of 408 children were referred to the Craniofacial Centre at the Helsinki University Hospital for further examination due to flatness of the posterior skull...
March 29, 2018: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/29588905/endoscopic-endonasal-resection-of-a-suprasellar-pituitary-adenoma-mimicking-tuberculum-sellae-meningioma-in-a-patient-with-an-intrasellar-persistent-trigeminal-artery
#19
Alaa S Montaser, Alexandre B Todeschini, Juan M Revuelta Barbero, Mostafa Shahein, E Antonio Chiocca, Bradley A Otto, Ricardo L Carrau, Daniel M Prevedello
A 50-year-old female with an incidentally diagnosed suprasellar lesion was initially managed conservatively due to the presence of an intrasellar persistent trigeminal artery going through the dorsum sellae and fundamentally forming the blood supply of the entire posterior circulation. Serial follow-up brain magnetic resonance imaging (MRI) revealed progressive enlargement of the suprasellar lesion over 4 years period. Surgery was indicated after the initial tumor growth; however, the patient refused surgery for fear of complications related to the persistent trigeminal artery...
April 2018: Journal of Neurological Surgery. Part B, Skull Base
https://www.readbyqxmd.com/read/29582975/feasibility-of-endoscopic-endonasal-approach-for-clip-application-of-cerebral-aneurysms-a-systematic-review
#20
Jonathan A Forbes, Sophie D' Herbemont, Kurt R Lehner, Diego Pineda Martinez, Ignacio P Navarro-Chávez, Diego Mendez Rosito, Theodore H Schwartz
INTRODUCTION: While open, microsurgical clipping and endovascular coiling remain the gold standards for treatment of cerebral aneurysms, a growing number of aneurysms treated via endoscopic endonasal methods have been reported in the literature. The aim of this study was to conduct a systematic review of the literature to gain a more thorough appreciation of the potential benefits and drawbacks of the endoscopic endonasal strategy in this setting. EVIDENCE ACQUISITION: We performed a detailed systematic review of the medical literature on endoscopic endonasal skull base surgery for treatment of cerebral aneurysms utilizing the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines...
March 26, 2018: Journal of Neurosurgical Sciences
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