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Optic nerve sheath

Michael T Milano, Jimm Grimm, Scott G Soltys, Ellen Yorke, Vitali Moiseenko, Wolfgang A Tomé, Arjun Sahgal, Jinyu Xue, Lijun Ma, Timothy D Solberg, John P Kirkpatrick, Louis S Constine, John C Flickinger, Lawrence B Marks, Issam El Naqa
PURPOSE: Dosimetric and clinical predictors of radiation-induced optic nerve/chiasm neuropathy (RION) after single-fraction stereotactic radiosurgery (SRS) or hypofractionated (2-5 fractions) radiosurgery (fSRS) were analyzed from pooled data that were extracted from published reports (PubMed indexed from 1990 to June 2015). This study was undertaken as part of the American Association of Physicists in Medicine Working Group on Stereotactic Body Radiotherapy, investigating normal tissue complication probability (NTCP) after hypofractionated radiation...
January 31, 2018: International Journal of Radiation Oncology, Biology, Physics
Vinayak Narayan, Nasser Mohammed, Amey R Savardekar, Devi Prasad Patra, Christina Notarianni, Anil Nanda
BACKGROUND: Traumatic brain injury [TBI] is a leading cause of pediatric morbidity and mortality worldwide and intracranial pressure [ICP] monitoring plays a crucial role in its management. Based on existing literature, the authors review the current practicing non-invasive ICP monitoring devices and their accuracy in predicting raised ICP in pediatric TBI. MATERIALS AND METHODS: A thorough literature search was conducted on PubMed, Medline and Cochrane data base, articles were selected systematically, reviewed completely and relevant data was summarized and discussed...
March 7, 2018: World Neurosurgery
Lilangi S Ediriwickrema, Neil R Miller
No abstract text is available yet for this article.
2018: International Ophthalmology Clinics
Aaron Dentinger, Michael MacDonald, Douglas Ebert, Kathleen Garcia, Ashot Sargsyan
OBJECTIVE:  The objective is enhanced ophthalmic ultrasound imaging to monitor ocular structure and intracranial dynamics changes related to visual impairment and intracranial pressure (ICP) induced by microgravity. The goals are to improve the ease of use and reduce operator variability by automatically rendering improved views of the anatomy and deriving new metrics of the morphology and dynamics. MATERIALS AND METHODS:  A prototype three-dimensional (3-D) probe was integrated onto a portable ultrasound scanner...
2018: Acta Neurochirurgica. Supplement
Chiara Robba, Danilo Cardim, Tamara Tajsic, Justine Pietersen, Michael Bulman, Frank Rasulo, Rita Bertuetti, Joseph Donnelly, Liu Xiuyun, Zofia Czosnyka, Manuel Cabeleira, Peter Smielewski, Basil Matta, Alessandro Bertuccio, Marek Czosnyka
BACKGROUND: Non-invasive measurement of intracranial pressure (ICP) can be invaluable in the management of critically ill patients. Invasive measurement of ICP remains the "gold standard" and should be performed when clinical indications are met, but it is invasive and brings some risks. In this project, we aim to validate the non-invasive ICP (nICP) assessment models based on arterious and venous transcranial Doppler ultrasonography (TCD) and optic nerve sheath diameter (ONSD)...
2018: Acta Neurochirurgica. Supplement
Dane H Slentz, Sunil Bellur, M Reza Taheri, M Isabel Almira-Suarez, Jonathan H Sherman, Tamer N Mansour
An elderly female with progressive proptosis was found to have an aggressive retrobulbar solid orbital mass. The mass was distinct from the optic nerve sheath and intracranial meninges, and produced concave erosion of the sphenoid wing. Operative findings demonstrated an orbital mass adherent to the dura of the superior orbital fissure. The mass did not demonstrate meningeal violation, infiltrate the superior orbital fissure, or display intracranial spread. The dura remained intact after gross total resection...
February 27, 2018: Orbit
Georgi Tchernev, Anastasiya Atanasova Chokoeva, Uwe Wollina, Torello Lotti, Georgi Konstantinov Maximov, Ilia Lozev
BACKGROUND: Neurofibromatosis type 1 ( NF1 ) is a multisystemic disorder with genetic background, characterised by specific cutaneous findings, skeletal dysplasias, and growth of both benign and malignant nervous system tumours. NF1 is caused by mutations in the NF1 gene, situated in chromosome 17q11.2, with an autosomal dominant pattern of inheritance and clinical manifestation of neurofibromas, malignant peripheral nerve sheath tumour, optic and non-optic nerve gliomas, congenital heart disease, cardiovascular and cerebrovascular disease and orthopaedic disorders...
January 25, 2018: Open Access Macedonian Journal of Medical Sciences
Abdulla Watad, Nicola L Bragazzi, Susanna Bacigaluppi, Howard Amital, Samaa Watad, Kassem Sharif, Bishara Bisharat, Anna Siri, Ala Mahamid, Hakim Abu Ras, Ahmed Nasr, Federico Bilotta, Chiara Robba, Mohammad Adawi
BACKGROUND: Artificial Intelligence (AI) techniques play a major role in anesthesiology, even though their importance is often overlooked. In the extant literature, AI approaches, such as Artificial Neural Networks (ANNs), have been underutilized, mainly being used to model patient's consciousness state, to predict the precise amount of anesthetic gases, the level of analgesia, or the need of anesthesiological blocks, among others. In the field of neurosurgery, ANNs have been effectively applied to the diagnosis and prognosis of cerebral tumors, seizures, low back pain, and also to the monitoring of intracranial pressure (ICP)...
February 23, 2018: Journal of Neurosurgical Sciences
Yücel Yüzbaşıoğlu, Sema Yüzbaşıoğlu, Selçuk Coşkun, Ferhat İçme, Tolga Öz, Refik Kunt, Sinan Becel, Emine Akçay, Havva Şahin Kavaklı
Background/aim: We aimed to show the role of determination of optic nerve sheath diameter (ONSD) by bedside ultrasonography in an emergency department in the diagnosis of cerebrovascular disorders and its correlation with the clinical picture. Materials and methods: This prospective cross-sectional study included 55 patients with cerebrovascular disorders and 53 controls. Age, sex, ONSD, comorbid disease status, and multidetector computed tomography results of all subjects and application periods and National Institutes of Health Stroke Scale (NIHSS) scores of the patient group were evaluated...
February 23, 2018: Turkish Journal of Medical Sciences
Shahan Waheed, Muhammad Akbar Baig, Emaduddin Siddiqui, Danyal Jamil, Masharib Bashar, Asher Feroze
Optic nerve sheath diameter measurement (ONSD) has been associated with identifying the prognosis of traumatic brain injury (TBI) patients. The study was planned to evaluate the prognostic value of ONSD measured on the initial brain computed tomography (CT) scan performed on patients with blunt TBI in the emergency department(ED). This retrospective cross-sectional study was conducted at the Aga Khan University Hospital, Karachi, and comprised data of moderate and severe TBI patients from January to December 2014...
February 2018: JPMA. the Journal of the Pakistan Medical Association
H E Killer, A Pircher
Normal tension glaucoma (NTG) is an exception in the "glaucoma family" where the major risk factor, increased intraocular pressure, is missing. If not increased intraocular pressure, then what other causes can then lead to glaucomatous optic disc change and visual field loss in NTG? Several possibilities will be discussed. Among them a higher sensitivity to normal pressure, vascular dysregulation, an abnormally high translaminar pressure gradient and a neurodegenerative process due to impaired cerebrospinal fluid dynamics in the optic nerve sheath compartment...
February 19, 2018: Eye
Ahmed Abdel Khalek Abdel Razek
The aim of this work is to review the MR imaging of neoplastic and non-neoplastic lesions of the brain and spine in neurofibromatosis type I. Neoplastic lesions are optic pathway gliomas, brain stem gliomas, other gliomas of the brain, and peripheral nerve sheath tumors. Structural changes in the brain include unidentified bright objects, macrocephaly, and enlarged corpus callosum. Bony dysplasia changes as sphenoid ridge dysplasia, spinal scalloping, dural ectasia, and meningoceles. Vasculopathy and cortical cerebral and cerebellar malformations of the brain have been reported...
February 17, 2018: Neurological Sciences
Andrea R Gilbert, Patricia Chévez-Barrios, Matthew D Cykowski
The suprachoroidal region of the eye comprises vascular channels, melanocytes, and thin fibroblasts with elongated cytoplasm that are positioned directly adjacent to the densely collagenous sclera. Morphological similarities between these suprachoroidal fibroblasts and arachnoid cells and perineurial cells have been recognized, but whether these fibroblasts have a perineurial cell-like immunophenotype is not known. To further examine the relationship of these three cell types, we investigated the comparative expression of epithelial membrane antigen (EMA), the tight junction protein claudin-1, glucose transporter-1 (Glut-1), and CD34 in suprachoroidal fibroblasts, arachnoid of the optic nerve sheath, and perineurium of ciliary nerves in eight human eye specimens...
February 1, 2018: Journal of Histochemistry and Cytochemistry: Official Journal of the Histochemistry Society
Ana Maria Abreu-Velez, Wendy Gao, Michael S Howard
Background: The majority of the patients affected by a new variant of endemic pemphigus foliaceus in El Bagre, Colombia (El Bagre EPF or pemphigus Abreu-Manu), have experienced vision problems; we have previously reported several ocular abnormalities. Methods: Here, we aimed to investigate reactivity to optic nerves in these patients. We utilized bovine, rat and mouse optic nerves, and performed immunofluorescence and confocal microscopy to test for optical nerve autoreactivity...
January 2018: Dermatology Practical & Conceptual
Fehmi Ferhi, Abdeljalil Khlifi, Feten Hachani, Khalil Tarmiz, Khaled Benjazia
Bilateral retinal detachments and cortical blindness are rare complications of preeclampsia and the association of the two pathologies is exceptional. We report the case of a preeclamptic patient who presented with an acute bilateral vision loss. Besides, her ocular ultrasound revealed bilateral retinal detachments and an elevated optic nerve sheath diameter. The patient underwent an urgent cesarean section. Subsequently, magnetic resonance imaging and ocular fundus examination confirmed the diagnosis.
February 12, 2018: Critical Ultrasound Journal
Hyung-Chul Lee, Won-Jong Lee, Yun-Sik Dho, Won-Sang Cho, Yong Hwy Kim, Hee-Pyoung Park
OBJECTIVE: The usefulness of optic nerve sheath diameter (ONSD) in predicting increased intracranial pressure (ICP) is not well established in adults with hydrocephalus. In this retrospective study, we evaluated the correlation between ONSD measured on brain computed tomography (CT) and ICP in adults with hydrocephalus. PATIENTS AND METHODS: ONSDs were measured on preoperative brain CT images from 64 adult patients with hydrocephalus who underwent extracranial ventricular drainage or a ventriculoperitoneal shunt in 2016...
February 7, 2018: Clinical Neurology and Neurosurgery
Toshihiko Inoue, Yoshishige Okuno, Iku Nishiguchi, Koji Ikenaga, Osamu Mimura
Purpose: To report the outcomes of early intervention with fractionated stereotactic radiotherapy (FSRT) in a patient with primary optic nerve sheath meningioma (ONSM). Patient and methods: A male patient in his early 40s underwent 5-beam FSRT at a prescribed dose of 50 Gy in 25 fractions over 35 days. The patient had an 11-month history of progressive visual impairment at the time of FSRT. Results: On day 14 of treatment, the patient reported early improvement in his vision...
2018: International Medical Case Reports Journal
José Luis Vázquez Martínez, Aiza Carolina Hernández Villarroel, María Tejado Castillo, María Sánchez Porras
No abstract text is available yet for this article.
February 8, 2018: Anales de Pediatría: Publicación Oficial de la Asociación Española de Pediatría (A.E.P.)
Aubrey L Gilbert, Bart Chwalisz, Robert Mallery
There are a number of surgical options for treatment of idiopathic intracranial hypertension (IIH) when it is refractory to medical treatment and weight loss. Optic nerve sheath fenestration (ONSF) is one of these options. Use of this procedure varies among centers due to experience with the procedure and concern for associated complications that can result in severe loss of vision. This review summarizes the literature concerning post-surgical complications of ONSF for IIH.
2018: Seminars in Ophthalmology
In-Jung Jun, Myong Kim, Joonho Lee, Se-Ung Park, Jai-Hyun Hwang, Jun Hyuk Hong, Young-Kug Kim
INTRODUCTION: Carbon dioxide pneumoperitoneum and the steep Trendelenburg position during robot-assisted laparoscopic prostatectomy (RALP) can increase the intracranial pressure (ICP). Mannitol is widely used to treat increased ICP. However, no studies to date have specifically evaluated the effect of mannitol on ICP in patients undergoing RALP. Ultrasonographic measurement of the optic nerve sheath diameter (ONSD) is considered a reliable technique to noninvasively evaluate the ICP. Therefore, this study compared ONSDs as a surrogate for ICP before and after mannitol administration in prostate cancer patients undergoing RALP...
February 7, 2018: Journal of Endourology
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