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Posterior Skull Base

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https://www.readbyqxmd.com/read/29288394/endoscopic-transorbital-route-to-the-petrous-apex-a-feasibility-anatomic-study
#1
Alberto Di Somma, Norberto Andaluz, Luigi Maria Cavallo, Thomaz E Topczewski, Federico Frio, Rosa Maria Gerardi, Jose Pineda, Domenico Solari, Joaquim Enseñat, Alberto Prats-Galino, Paolo Cappabianca
BACKGROUND: While the subtemporal approach represents the surgical module milestone designed to reach the petrous apex, a novel ventral route, which is the superior eyelid endoscopic transorbital approach, has been proposed to access the skull base. Accordingly, we aimed to evaluate the feasibility of this route to the petrous apex, providing a qualitative and quantitative analysis of this relatively novel pathway. METHODS: Five human cadaveric heads were dissected at the Laboratory of Surgical NeuroAnatomy of the University of Barcelona...
December 29, 2017: Acta Neurochirurgica
https://www.readbyqxmd.com/read/29279809/duplication-of-the-sphenomandibular-ligament
#2
Emily Simonds, Joe Iwanaga, Rod J Oskouian, R Shane Tubbs
The normal origin of attachment of the sphenomandibular ligament is from the spine of the sphenoid bone and derailment of its course might interfere with mandibular nerve anesthetic blockade. During routine dissection of the skull base and mandibular region, a case of an anatomical variation of the sphenomandibular ligament was observed. The ligament was found to be composed of two parts; an anterior part with a wide origin from the spine of the sphenoid bone and a posterior part arising from the mandibular fossa of the temporal bone...
October 18, 2017: Curēus
https://www.readbyqxmd.com/read/29236280/intracranial-abscess-formation-following-sphenoid-sinus-occlusion-with-nasoseptal-flap-skull-base-reconstruction-a-cautionary-tale
#3
George S Tarasidis, Jeremiah A Alt, Richard R Orlandi
The formation of an intracranial abscess secondary to sphenoid sinus occlusion after nasoseptal flap skull base reconstruction has not been previously described. We report such a case that occurred at our institution in a 23-year-old man who underwent flap reconstruction for a cerebrospinal fluid leak. We determined that occlusion of the sphenoid sinus outflow might have played a role in this complication. The patient was treated via a combined surgical and medical approach that entailed a bur-hole craniotomy and endoscopic debridement followed by administration of an intravenous antibiotic...
December 2017: Ear, Nose, & Throat Journal
https://www.readbyqxmd.com/read/29206291/cranial-shape-variation-in-adult-howler-monkeys-alouatta-seniculus
#4
Luca Fiorenza, Emiliano Bruner
Howler monkeys (genus Alouatta) display a distinctive cranial architecture characterized by airorhynchy (or retroflexion of the facial skeleton on the cranial base), a small braincase, and a posteriorly oriented foramen magnum. This configuration has been associated with distinct factors including a high folivory diet, locomotion, and the presence of a specialized vocal tract characterized by large hyoid bone. However, the morphological relationships between the facial and neurocranial blocks in Alouatta have been scarcely investigated...
December 5, 2017: American Journal of Primatology
https://www.readbyqxmd.com/read/29194713/intraspecific-variation-in-the-domestic-cat-bony-labyrinth-revealed-by-different-measurement-techniques
#5
Rico Schellhorn
The knowledge of intraspecific variation is important to make assumptions on an interspecific level. To study intraspecific variation in the bony labyrinth morphology of the domestic cat, eleven specimens of Felis silvestris catus and two additional subspecies (F. s. lybica, F. s. ornata) were investigated. The sample comprises skulls of adult males and females, as well as juvenile cats. Each bony labyrinth endocast was virtually reconstructed based on µCT scans. To estimate the radius of curvature of each inner ear semicircular canal, three different approaches were tested...
December 1, 2017: Journal of Morphology
https://www.readbyqxmd.com/read/29194275/preoperative-exposure-of-sigmoid-sinus-trajectory-in-posterolateral-cranial-base-approaches-using-a-new-landmark-through-a-neurosurgical-perspective
#6
Ihsan Doğan, Onur Özgüral, Ümit Eroğlu, Eyyub S M Al-Beyati, Cemil M Kilinç, Ayhan Cömert, Hasan Çağlar Uğur
The location of burr holes in posterolateral cranial base approaches should be appropriate to provide an adequate operative field, and surgical freedom is crucial for bone window opening. The aim of this study was to search for more convenient and easily detectable landmarks in comparison with current landmarks in posterolateral cranial base surgery. Twenty 3-dimensional reconstructed head and neck computed tomography angiography images (group 1) and 20 cadaver heads (group 2) were evaluated. An imaginary line connecting the angle of the mandible and the mastoid tip was extended upward...
November 20, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/29191538/collet-sicard-syndrome-attributable-to-extramedullary-plasmacytoma-of-the-jugular-foramen
#7
Soliman Oushy, Christopher S Graffeo, Avital Perry, Jonathan M Morris, Matthew L Carlson, Jamie J Van Gompel
BACKGROUND: Collet-Sicard syndrome is a rare manifestation of skull base disease involving the jugular and hypoglossal foramina. We report the first case of Collet-Sicard attributable to extramedullary plasmacytoma-multiple myeloma (EP-MM), as well as the second case of EP-MM precipitating a jugular foramen syndrome (JFS)-spectrum disorder. CASE DESCRIPTION: A fifty-nine-year-old woman presented with 4-months of left aural fullness and pulsatile tenderness, positional vertigo, hoarseness, and dysphagia...
November 27, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/29187780/the-skull-of-epidolops-ameghinoi-from-the-early-eocene-itabora%C3%A3-fauna-southeastern-brazil-and-the-affinities-of-the-extinct-marsupialiform-order-polydolopimorphia
#8
Robin M D Beck
The skull of the polydolopimorphian marsupialiform Epidolops ameghinoi is described in detail for the first time, based on a single well-preserved cranium and associated left and right dentaries plus additional craniodental fragments, all from the early Eocene (53-50 million year old) Itaboraí fauna in southeastern Brazil. Notable craniodental features of E. ameghinoi include absence of a masseteric process, very small maxillopalatine fenestrae, a prominent pterygoid fossa enclosed laterally by a prominent ectopterygoid crest, an absent or tiny transverse canal foramen, a simple, planar glenoid fossa, and a postglenoid foramen that is immediately posterior to the postglenoid process...
2017: Journal of Mammalian Evolution
https://www.readbyqxmd.com/read/29174239/the-efficiency-and-safety-of-the-autologous-fat-graft-in-reconstruction-of-skull-base-defects-after-resection-of-skull-base-meningiomas
#9
Hussam Metwali, Venelin Gerganov, Breno Nery, Ahmed Aly, Rodrigo Avila-Cervantes, Madjid Samii
INTRODUCTION: reconstruction of skull base after resection of skull base meningioma is of paramount importance. We are presenting a safe and effective method of skull base reconstruction METHODS: a retrospective analysis of patients operated for skull base meningioma from 2007 to 2014. We analyzed the surgical technique, efficiency and safety as well as the graft-related complications. RESULTS: Autologous free fat graft had been used in 55 patients. Thirty nine patients had posterior fossa meningioma related to the petrous bone, and sixteen patients had anterior fossa meningiomas related to the paranasal sinuses...
November 23, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/29166425/anatomy-of-the-sphenopalatine-artery-and-its-implications-for-transnasal-neurosurgery
#10
M Eordogh, A Grimm, I Gawish, L Patonay, R Reisch, H R Briner, G Baksa
BACKGROUND: The knowledge of sinonasal vasculature is inevitable in transnasal neurosurgery. We performed an anatomical study on the sphenopalatine artery from the perspective of skull base procedures. METHODOLOGY: To analyse the anatomical landmarks of the sphenopalatine artery, arterial skull corrosion casts (26 head halves) underwent endoscopic transnasal phantom surgery. Furthermore, we performed microsurgical dissection on formaldehyde-fixated cadavers with arterial perfusion (14 head halves) as well as studied Cone Beam CT-scans of anonymised patients and cadavers (115 head sides)...
November 22, 2017: Rhinology
https://www.readbyqxmd.com/read/29160345/influence-of-the-cranial-base-flexion-on-class-i-ii-and-iii-malocclusions-a-systematic-review
#11
Kélei Cristina Mathias de Almeida, Taísa Boamorte Raveli, Camila Ivini Viana Vieira, Ary Dos Santos-Pinto, Dirceu Barnabé Raveli
OBJECTIVE: The aim of this study was to perform a systematic review on the morphological characteristics of the skull base (flexion, anterior length and posterior length) and the concomitant development of malocclusions, by comparing differences in dimorphism, ethnicity and age. METHODS: The articles were selected by means of electronic search on BBO, MEDLINE and LILACS databases from 1966 to 2016. A qualitative evaluation of the methodologies used on the articles was also performed...
September 2017: Dental Press Journal of Orthodontics
https://www.readbyqxmd.com/read/29134168/anatomical-region-segmentation-for-objective-surgical-skill-assessment-with-operating-room-motion-data
#12
Yangming Li, Randall A Bly, R Alex Harbison, Ian M Humphreys, Mark E Whipple, Blake Hannaford, Kris S Moe
Background  Most existing objective surgical motion analysis schemes are limited to structured surgical tasks or recognition of motion patterns for certain categories of surgeries. Analyzing instrument motion data with respect to anatomical structures can break the limit, and an anatomical region segmentation algorithm is required for the analysis. Methods  An atlas was generated by manually segmenting the skull base into nine regions, including left/right anterior/posterior ethmoid sinuses, frontal sinus, left and right maxillary sinuses, nasal airway, and sphenoid sinus...
December 2017: Journal of Neurological Surgery. Part B, Skull Base
https://www.readbyqxmd.com/read/29124088/considerations-and-code-for-partial-volume-correcting-18-f-av-1451-tau-pet-data
#13
Suzanne L Baker, Anne Maass, William J Jagust
[(18)F]-AV-1451 is a leading tracer used with positron emission tomography (PET) to quantify tau pathology. However, [(18)F]-AV-1451 shows "off target" or non-specific binding, which we define as binding of the tracer in unexpected areas unlikely to harbor aggregated tau based on autopsy literature [1]. Along with caudate, putamen, pallidum and thalamus non-specific binding [2], [3], we have found binding in the superior portion of the cerebellar gray matter, leading us to use inferior cerebellar gray as the reference region...
December 2017: Data in Brief
https://www.readbyqxmd.com/read/29094072/endoscopic-unilateral-transethmoid-paraseptal-approach-to-the-central-skull-base
#14
Márton Eördögh, Hans Rudolf Briner, Daniel Simmen, Nicholas Jones, Robert Reisch
Objectives: The endoscopic technique in transnasal skull base surgery offers optimal visualization and free manipulation in the surgical field. However, it may cause approach-related sinonasal injury, influencing patients' quality of life (QOL). To minimize rhinological morbidity without restrictions in surgical manipulation and tumor resection, we introduced the unilateral transethmoidal-paraseptal approach. In this article, we analyzed the long-term results and sinonasal outcome of this technique...
October 2017: Laryngoscope Investigative Otolaryngology
https://www.readbyqxmd.com/read/29072661/-the-application-of-the-computer-technologies-for-the-mathematical-simulation-of-the-ethmoidal-labyrinth
#15
M V Markeeva, O V Mareev, V N Nikolenko, G O Mareev, T V Danilova, E A Fadeeva, R V Fedorov
The objective of the present work was to study the relationship between the dimensions of the ethmoidal labyrinth and the skull in the subjects differing in the nose shape by means of the factorial and correlation analysis with the application of the modern computer-assisted methods for the three-dimensional reconstruction of the skull. We developed an original method for computed craniometry with the use the original program that made it possible to determine the standard intravital craniometrics characteristics of the human skull with a high degree of accuracy based on the results of analysis of 200 computed tomograms of the head...
2017: Vestnik Otorinolaringologii
https://www.readbyqxmd.com/read/29065093/cochlear-implantation-in-cochlear-ossification-retrospective-review-of-etiologies-surgical-considerations-and-auditory-outcomes
#16
Ashish Vashishth, Andrea Fulcheri, Sampath Chandra Prasad, Margherita Bassi, Gianluca Rossi, Antonio Caruso, Mario Sanna
OBJECTIVES: 1) To review the surgical and auditory outcomes and complications of cochlear implantation in cases with cochlear ossification. 2) To evaluate association between the extent and etiology of ossification to outcomes. STUDY DESIGN: Retrospective study. SETTING: Otology and skull base surgery center. SUBJECTS AND METHODS: Charts of 40 patients (42 ears) with cochlear ossification undergoing cochlear implantation were reviewed...
October 23, 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/29057351/versatility-of-sub-occipital-approach-for-foramen-magnum-meningiomas-a-single-centre-experience
#17
Antonio Bocchetti, Valentina Cioffi, Cristian Gragnaniello, Raffaele de Falco
BACKGROUND: Foramen magnum meningiomas (FMM) represent a challenge for neurosurgeons. Multiple surgical strategies have been reported to treat these lesions in their variable location. Contemporary technical innovations allow the utilization of common sub-occipital craniotomy to treat ventrally, ventro-laterally and dorsally located FMMs. We present our technique and experience. METHODS: From November 2004 to November 2015, we treated 14 patients with FMM at the Department of Neurosurgery of the Santa Maria delle Grazie Hospital in Pozzuoli, Naples, Italy...
September 2017: Journal of Spine Surgery (Hong Kong)
https://www.readbyqxmd.com/read/29024761/pattern-of-closure-of-skull-base-synchondroses-in-crouzon-syndrome
#18
Guillaume Coll, Laurent Sakka, Céline Botella, Nathalie Pham-Dang, Corine Collet, Michel Zerah, Eric Arnaud, Federico Di Rocco
BACKGROUND: The age of closure of skull base synchondroses has never been analyzed in a homogenous population of children with Crouzon syndrome. METHOD: A retrospective case-control study was performed on 30 Crouzon children (17M, 13F) aged 1 month to 12.48 years with Fibroblast Growth Factor Receptor type 2 mutation. Eleven synchondroses were analyzed on millimetric computed tomodensitometry slices before surgery. Syndromic patients were compared to a series of 235 healthy children previously published...
October 9, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28990662/the-radioanatomy-of-endonasal-flap-coverage-of-skull-base-defects-a-tool-for-preoperative-planning
#19
Francisco J D MacArthur, Gerald W McGarry
OBJECTIVES/HYPOTHESIS: To develop a tool for the calculation of surgical skull base defects and endonasal flap dimensions on preoperative computed tomography (CT) to aid surgical planning. STUDY DESIGN: Case series. METHODS: A literature search was conducted to identify all endonasal flaps. There were five basic models identified. These are the nasoseptal flap, anterior lateral nasal wall flap, bipedicled anterior septal flap, posterior pedicled inferior turbinate flap, and middle turbinate flap...
October 9, 2017: Laryngoscope
https://www.readbyqxmd.com/read/28986226/internal-carotid-artery-and-its-relationship-with-structures-in-sellar-region-anatomy-study-and-its-clinical-applications
#20
Yishui Zhang, Wen Yang
BACKGROUND: Complications of the ICA in surgeries are rare but severe. This study aims to locate the ICA with 5 stationary bony structures in the sellar region: the anterior clinoid process (ACP), the tuberculum sellae, the bottom of the hypophyseal fossa, the posterior edge of the hypophyseal fossa and the post clinoid process and do measurements to determine their anatomic relationship with the ICA. METHODS: After multiple planar reconstructions on computer tomographic angiography images of 120 ICA in 60 individuals, we defined the 5 bony structures as 5 origins in horizontal, sagittal and vertical planes with the 3D coordinate system and got the cross-sections of bilateral ICA on the coronal plane passing through each origin...
October 3, 2017: World Neurosurgery
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