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Optic canal

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https://www.readbyqxmd.com/read/29317363/spheno-orbital-meningiomas-surgery-multicenter-management-study-for-complex-extensive-tumors
#1
Louis-Marie Terrier, Florian Bernard, Henri-Dominique Fournier, Xavier Morandi, Stéphane Velut, Pierre-Louis Hénaux, Aymeric Amelot, Patrick François
BACKGROUND: Spheno-orbital meningiomas (SOMs) are complex tumors involving the sphenoid wing, the orbit, and sometimes the cavernous sinus with bone hyperostosis and sheet-like dural involvement. Optimal removal, proptosis cure and visual preservation remain a challenge. OBJECTIVE: To study the management of surgically treated SOMs METHODS: The clinical records of 130 consecutive patients undergoing surgery for SOMs were retrospectively collected in a database during a 20-year period to analyze symptoms, surgical technique, clinical outcome, and follow-up...
January 6, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29306766/clinical-management-of-traumatic-superior-orbital-fissure-and-orbital-apex-syndromes
#2
Hai Jin, Shun Gong, Kaiwei Han, Junyu Wang, Liquan Lv, Yan Dong, Danfeng Zhang, Lijun Hou
OBJECTIVES: Both traumatic orbital apex syndrome (OAS) and traumatic superior orbital fissure syndrome (SFOS) are rare conditions after craniofacial injury. Few types of researches investigate the difference in clinical characteristics and outcome between them. We describe clinical features and cranial nerves functional recovery of traumatic OAS or SOFS and to discuss surgical decompression of these patients. PATIENTS AND METHODS: A retrospective study was performed of 15 patients diagnosed with traumatic OAS and 39 patients with traumatic SOFS from July 2010 to July 2017 in our hospital...
December 30, 2017: Clinical Neurology and Neurosurgery
https://www.readbyqxmd.com/read/29287000/an-applied-anatomical-study-of-the-ethmoidal-arteries-computed-tomographic-and-direct-measurements-in-human-cadavers
#3
Ulrik Ascanius Felding, Kirstine Karnov, Anne Clemmensen, Carsten Thomsen, Tron A Darvann, Christian von Buchwald, Jørgen Tranum-Jensen
Computed tomography (CT) images have been used in very few studies on distances to the ethmoidal arteries in the orbit. Most other studies have included direct measurements on cadavers and frequently quote the 24-12-6 mm rule to describe distances from the anterior lacrimal crest to the anterior and posterior ethmoidal foramina (AEF and PEF), optic canal (OC), respectively. However, the large interindividual variation of distances renders absolute values less applicable in a clinical setting. Preoperative measurements on CT images may provide more precise distances than absolute rules and thus lead to safer orbital surgery...
January 2018: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/29276604/spontaneous-cerebrospinal-fluid-leak-from-the-optic-canal
#4
Kyle Hannabass, Jeb M Justice
Objective: To present a case of successful repair of a spontaneous cerebrospinal fluid leak in a previously unreported anatomic site. Methods: Retrospective chart review. Results: A 48-year-old woman developed a spontaneous cerebrospinal fluid leak from the optic nerve sheath and underwent a multilayer endoscopic closure with no damage to the optic nerve. Conclusion: Endoscopic surgeons can successfully repair cerebrospinal fluid leaks from the optic nerve sheath without causing loss of vision...
2017: SAGE Open Medical Case Reports
https://www.readbyqxmd.com/read/29273266/in-vitro-and-in-vivo-measurement-of-the-animal-s-middle-ear-acoustical-response-by-partially-implantable-fiber-optic-sensing-system
#5
Zoran Djinović, Robert Pavelka, Miloš Tomić, Georg Sprinzl, Hanns Plenk, Udo Losert, Helga Bergmeister, Roberto Plasenzotti
The main obstacle in realization of a totally implantable hearing aid is a lack of reliable implantable microphone. In this paper we have described a potentially miniature fiber-optic vibrometer based on a modified Michelson interferometer, designed to serve as a middle-ear microphone for totally implantable cochlear- or middle-ear hearing aids. A model of the sensing system was used for in-vitro and in-vivo investigation of acoustical response of sheep's middle-ear ossicles. Surgical and implantation procedure of introducing the sensing optical fiber into the middle-ear and its aiming at the incus was investigated and described here in detail...
December 10, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29250759/orbital-cellulitis-presenting-as-giant-cell-arteritis-a-case-report
#6
Yu-Wei Hsu, Fu-Chi Yang, Jiunn-Tay Lee, Hung-Wen Kao, Chia-Kuang Tsai
PURPOSE: To present a case of orbital cellulitis initially mimicking giant cell arteritis. CASE REPORT: An 80-year-old man with a history of hypertension and type 2 diabetes mellitus was referred with a prominent progressive headache over the right temporal and periorbital areas. Non-contrast brain CT results were normal, but ESR was elevated. Giant cell arteritis was suspected initially. However, the symptoms progressed under oral corticosteroid therapy. The subsequent brain MRI with contrast revealed extensive contrast enhancement along the right optic nerve and optic canal with a rim-enhancing lesion in the posterior aspect of the optic nerve...
June 15, 2017: Acta Neurologica Taiwanica
https://www.readbyqxmd.com/read/29230932/a-multi-modality-tracking-navigation-and-calibration-for-a-flexible-robotic-drill-system-for-total-hip-arthroplasty
#7
Ahmad Nazmi Bin Ahmad Fuad, Kamal Deep, Wei Yao
BACKGROUND: This paper presents a novel multi-modality tracking and navigation system that provides a unique capability to guild a flexible drill tip inside the bone with accurate curved tunnelling. METHODS: As the flexible drill tip cannot be tracked optically inside the bone, this research focuses on developing a hybrid tracking and navigation system for tracking a flexible drill tip by using both optical and kinematic tracking. The tracking information is used to guide the THA (total hip arthroplasty) procedure, providing a real-time virtual model of the flexible drill...
December 12, 2017: International Journal of Medical Robotics + Computer Assisted Surgery: MRCAS
https://www.readbyqxmd.com/read/29221472/odontoblast-like-differentiation-and-mineral-formation-of-pulpsphere-derived-cells-on-human-root-canal-dentin-in-vitro
#8
Jörg Neunzehn, Sandra Pötschke, Christian Hannig, Hans-Peter Wiesmann, Marie-Theres Weber
BACKGROUND: The revitalization or regeneration of the dental pulp is a preferable goal in current endodontic research. In this study, human dental pulp cell (DPC) spheres were applied to human root canal samples to evaluate their potential adoption for physiological tissue-like regeneration of the dental root canal by odontoblastic differentiation as well as cell-induced mineral formation. METHODS: DPC were cultivated into three-dimensional cell spheres and seeded on human root canal specimens...
December 8, 2017: Head & Face Medicine
https://www.readbyqxmd.com/read/29201205/bone-engineering-by-cell-sheet-technology-to-repair-mandibular-defects
#9
Xiuli Shan, Deshan Hu
Effectiveness of bone engineering by cell sheet technology to repair canine mandibular injuries was investigated. Cell sheets were produced from canine stem cells cultured by density gradient centrifugation and osteoblast induction. A scaffold surface of polylactic-co-glycolic acid (PLGA) copolymer was wrapped with cell sheets. Mandibular injuries were created in 12 healthy dogs followed by implantation of PLGA with (experimental group; n, 6) and without (control group; n, 6) cell sheets. The progression of the implants was examined at 3, 9, and 12 weeks postoperative...
November 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/29194201/evaluation-of-long-term-anatomic-changes-following-canaloplasty-with-anterior-segment-spectral-domain-optical-coherence-tomography-and-ultrasound-biomicroscopy
#10
David Kuerten, Niklas Plange, Jakob Becker, Peter Walter, Matthias Fuest
BACKGROUND: To analyze long-term structural changes in conjunctiva, sclera and Schlemm canal (SC) with anterior segment optical coherence tomography (AS-OCT) and ultrasound biomicroscopy (UBM) following uncomplicated canaloplasty. MATERIALS AND METHODS: Fifteen patients with planned canaloplasty and no intraoperative complications were included in this prospective study. AS-OCT images were acquired at 1, 3, 6 months and at a long-term time point (20±4.9 mo) postsurgery...
November 30, 2017: Journal of Glaucoma
https://www.readbyqxmd.com/read/29190014/hypertonic-saline-injection-model-of-experimental-glaucoma-in-rats
#11
John C Morrison, Elaine C Johnson, William O Cepurna
A reliable method of creating chronic elevation of intraocular pressure (IOP) in rodents is an important tool in reproducing and studying the mechanisms of optic nerve injury that occur in glaucoma. In addition, such a model could provide a valuable method for testing potential neuroprotective treatments. This paper outlines the basic methods for producing obstruction of aqueous humor outflow and IOP elevation by injecting hypertonic saline (a sclerosant) into the aqueous outflow pathway. This is one of several rodent glaucoma models in use today...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29183046/in-vivo-analysis-of-angle-dysgenesis-in-primary-congenital-juvenile-and-adult-onset-open-angle-glaucoma
#12
Viney Gupta, Abadh K Chaurasia, Shikha Gupta, Bhavya Gorimanipalli, Ajay Sharma, Amisha Gupta
Purpose: The purpose of this study was to comparatively evaluate angle dysgenesis in vivo, among congenital, juvenile, and adult-onset open angle glaucoma patients. Methods: A cross-sectional evaluation of 96 glaucoma patients, 22 children with primary congenital glaucoma (PCG) old enough to cooperate for optical coherence tomography (OCT), 34 juvenile-onset open angle glaucoma (JOAG) patients, 40 adult-onset primary open angle glaucoma (POAG), and 30 healthy subjects, was carried out using high-resolution anterior segment spectral domain (SD)-OCT...
November 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29166538/antimicrobial-photodynamic-therapy-associated-with-conventional-endodontic-treatment-a-clinical-and-molecular-microbiological-study
#13
Caroline C da Silva, Sérgio P Chaves Júnior, Gabriela L D Pereira, Karla B F C da Fontes, Lívia A A Antunes, Helvécio C C Póvoa, Leonardo S Antunes, Natalia L P Póvoa Iorio
This study evaluated antimicrobial photodynamic therapy (aPDT) as an adjunct to endodontic treatment. Ten uniradicular teeth (control group (CG)= 4 (2 and test group (TG)= 6) with primary endodontic infections, from both genders, between 17 and 65 years old, were analyzed. Microbiological samples were collected before and after chemical-mechanical instrumentation (CMI), after aPDT (for the TG), and after the removal of the temporary restorations (second session). In TG, the aPDT was performed with 100 μg/mL methylene blue and irradiated with low power laser (InGaAIP, 660 nm; 100 mW; 40 sec) with a fiber-coupled optical laser...
November 22, 2017: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/29149722/effects-of-middle-ear-quasi-static-stiffness-on-sound-transmission-quantified-by-a-novel-3-axis-optical-force-sensor
#14
Ivo Dobrev, Jae Hoon Sim, Baktash Aqtashi, Alexander M Huber, Thomas Linder, Christof Röösli
BACKGROUND: Intra-operative quantification of the ossicle mobility could provide valuable feedback for the current status of the patient's conductive hearing. However, current methods for evaluation of middle ear mobility are mostly limited to the surgeon's subjective impression through manual palpation of the ossicles. This study investigates how middle ear transfer function is affected by stapes quasi-static stiffness of the ossicular chain. The stiffness of the middle ear is induced by a) using a novel fiber-optic 3-axis force sensor to quantify the quasi-static stiffness of the middle ear, and b) by artificial reduction of stapes mobility due to drying of the middle ear...
November 10, 2017: Hearing Research
https://www.readbyqxmd.com/read/29145656/refining-operative-strategies-for-optic-nerve-decompression-a-morphometric-analysis-of-transcranial-and-endoscopic-endonasal-techniques-using-clinical-parameters
#15
Steven L Gogela, Lee A Zimmer, Jeffrey T Keller, Norberto Andaluz
BACKGROUND: Various approaches can be considered for decompression of the intracanalicular optic nerve. Although clinical experience has been reported, no quantitative study has yet compared the extent of decompression achieved by an endoscopic endonasal versus transcranial approach. OBJECTIVE: Toward this aim, our morphometric analysis compared both approaches by quantifying the circumferential degree of optic canal decompression that is possible before any meningeal violation, which would result in cerebrospinal fluid (CSF) leak...
May 3, 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/29137056/optic-nerve-injury-associated-blunt-cerebrovascular-injury-three-case-reports
#16
Dan-Dong Li, Liu-Xun Hu, Linyuan Sima, Shang-Yu Xu, Jian Lin, Nu Zhang, Bo Yin
RATIONALE: Blunt cerebrovascular injury (BCVI) is a rare complication that may occur after craniocervical trauma. The current literature is limited to extracranial carotid artery injuries; however, no reports have been published on blunt intracranial carotid injury (BICI), especially those associated with optic nerve injury. PATIENT CONCERNS: Here we report on 3 BICI cases that demonstrated optic nerve injuries after craniofacial injuries. All 3 patients showed post-trauma vision loss on the injured side...
November 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29117278/diurnal-variations-in-the-morphology-of-schlemm-s-canal-and-intraocular-pressure-in-healthy-chinese-an-ss-oct-study
#17
Kai Gao, Fei Li, Tin Aung, Xiulan Zhang
Purpose: To characterize the diurnal variations in the dimensions of the Schlemm's canal (SC) and its association with intraocular pressure (IOP) using swept-source optical coherence tomography (SS-OCT). Methods: The temporal, nasal, inferior, and superior limbus of 102 eyes of 51 healthy subjects were imaged in vivo by SS-COT at 5 time points of 8 AM, 11 AM, 2 PM, 5 PM, and 8 PM. IOP was measured at the same time by Goldmann applanation tonometry (GAT). The diameter and the cross-sectional area of the SC were measured in ImageJ...
November 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29114316/pure-intra-optic-canal-schwannoma-report-of-two-cases
#18
Sayuru Miyamura, Satoshi Yamaguchi, Masaaki Takeda, Takafumi Mitsuhara, Masahiro Hosogai, Kazuhiko Sugiyama, Kaoru Kurisu
We report two cases of "pure intra-optic-canal schwannoma." The first patient was a 67-year-old female who presented with a visual field defect and visual impairment in the right eye, and the second patient was a 17-year-old female with progressive visual impairment. Both patients underwent tumor resection through frontotemporal craniotomy combined with extradural anterior clinoidectomy and unroofing of the optic canal. The tumors were not attached to the optic nerve (ON) and were located exclusively inside the optic canal...
October 2017: Asian Journal of Neurosurgery
https://www.readbyqxmd.com/read/29106310/comparison-of-microtomography-and-optical-coherence-tomography-on-apical-endodontic-filling-analysis
#19
Fernanda Clotilde Mariz Suassuna, Ana Marly Araújo Maia, Daniela Pita Melo, Antônio Celso Dantas Antonino, Anderson Stevens Leônidas Gomes, Patrícia Meira Bento
OBJECTIVES: To comparein vitro differences in the apical filling regarding working length (WL) change and presence of voids and to validate optical coherence tomography (OCT) in comparison with computerized microtomography (µCT) for the detection of failures in the apical filling. METHODS: Forty-five uniradicular teeth with round canals, divided into groups (n = 15) following the obturation protocols: LC (lateral condensation), TMC (thermomechanical compaction) and SC (single cone)...
November 16, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/29103273/a-case-of-engorged-female-hard-tick-in-the-external-auditory-canal-of-an-infant
#20
Woo-Jung Sung, Yee-Hyuk Kim
An oval-shaped mass with a smooth surface was found in the ear canal of a 22-month-old male infant. Although the mass appeared to be almost entirely blocking the ear canal, it was successfully removed under a surgical microscope without general anesthesia at the outpatient department. Under an optical microscope with hematoxylin and eosin staining, the specimen was observed to have a cuticle with a serrated surface and a pore canal, as well as parts of the capitulum, salivary glands, muscles, midgut, and the legs...
October 2017: Korean Journal of Parasitology
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