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Optic nerve sheath

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https://www.readbyqxmd.com/read/28812914/retrospective-chart-review-of-the-use-of-imaging-and-biopsy-in-the-diagnosis-of-optic-nerve-sheath-meningiomas-and-intra-conal-orbital-lymphomas-at-a-single-institution
#1
Anna Parlin, Alina Dumitrescu, William T Nunery, Peter J Timoney, Jason A Sokol
Optic nerve sheath meningiomas (ONSM) and intra-conal orbital lymphomas are common entities on the differential of a retrobulbar optic nerve involving space-occupying lesion. In this study, we compare the pre-surgical diagnosis, based on clinical presentation and neuroimaging, to the surgical pathology results of intra-conal orbital lymphomas and ONSM. This is an IRB approved retrospective chart review of orbital lymphomas and optic nerve sheath meningiomas biopsied by a single surgeon over a 4-year period at a single institution...
August 16, 2017: Orbit
https://www.readbyqxmd.com/read/28801417/optic-nerve-sheath-diameter-sonography-for-the-diagnosis-of-increased-intracranial-pressure-a-systematic-review-and-meta-analysis-protocol
#2
Alex Koziarz, Niv Sne, Fraser Kegel, Waleed Alhazzani, Siddharth Nath, Jetan H Badhiwala, Timothy Rice, Paul Engels, Faidi Samir, Andrew Healey, Kamyar Kahnamoui, Laura Banfield, Sunjay Sharma, Kesava Reddy, Gregory W J Hawryluk, Andrew W Kirkpatrick, Saleh A Almenawer
INTRODUCTION: Increased intracranial pressure (ICP) is a significant neurological issue that may lead to permanent neurological sequelae. When evaluating patients with traumatic brain injury, it is crucial to identify those with high ICP in order to expedite ICP lowering measures and maintain adequate cerebral perfusion. Several measures are used to recognise patients with increased ICP including CT scan, MRI, ICP monitor, and lumbar puncture (LP). However, these tests can be invasive, associated with radiation exposure, contraindicated, or not readily available...
August 11, 2017: BMJ Open
https://www.readbyqxmd.com/read/28771407/imaging-strategies-for-suspected-acute-cranial-shunt-failure-a-cost-effectiveness-analysis
#3
Jay Pershad, Andrew Taylor, M Kennedy Hall, Paul Klimo
OBJECTIVES: We compared cost-effectiveness of cranial computed tomography (CT), fast sequence magnetic resonance imaging (fsMRI), and ultrasonography measurement of optic nerve sheath diameter (ONSD) for suspected acute shunt failure from the perspective of a health care organization. METHODS: We modeled 4 diagnostic imaging strategies: (1) CT scan, (2) fsMRI, (3) screening ONSD by using point of care ultrasound (POCUS) first, combined with CT, and (4) screening ONSD by using POCUS first, combined with fsMRI...
August 2017: Pediatrics
https://www.readbyqxmd.com/read/28768582/blind-overnight-a-case-of-fulminant-idiopathic-intracranial-hypertension
#4
Janpreet Singh Bhandohal, Taimur Mirza
Idiopathic Intracranial Hypertension (IIH) is a syndrome seen predominantly in obese women of reproductive age group, characterized by signs and symptoms of increased intracranial pressure due to an unknown cause. Some individuals have a more malignant form of disease called fulminant idiopathic intracranial hypertension with rapid worsening of symptoms over days. We report a case of 33year-old obese female (BMI 36.9) who presented with a severe headache and blurred vision for one week, found to have idiopathic intracranial hypertension with rapid worsening of symptoms suggestive of a fulminant course of disease...
July 5, 2017: American Journal of Emergency Medicine
https://www.readbyqxmd.com/read/28746249/optic-nerve-sheath-meningocele-simulating-an-optic-nerve-pit
#5
Sara E Lally, Ann P Murchison, Adam E Flanders, Jurij R Bilyk
No abstract text is available yet for this article.
July 25, 2017: Ophthalmic Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28742869/ultrasound-non-invasive-measurement-of-intracranial-pressure-in-neurointensive-care-a-prospective-observational-study
#6
Chiara Robba, Danilo Cardim, Tamara Tajsic, Justine Pietersen, Michael Bulman, Joseph Donnelly, Andrea Lavinio, Arun Gupta, David K Menon, Peter J A Hutchinson, Marek Czosnyka
BACKGROUND: The invasive nature of the current methods for monitoring of intracranial pressure (ICP) has prevented their use in many clinical situations. Several attempts have been made to develop methods to monitor ICP non-invasively. The aim of this study is to assess the relationship between ultrasound-based non-invasive ICP (nICP) and invasive ICP measurement in neurocritical care patients. METHODS AND FINDINGS: This was a prospective, single-cohort observational study of patients admitted to a tertiary neurocritical care unit...
July 2017: PLoS Medicine
https://www.readbyqxmd.com/read/28736129/clinical-and-radiological-predictors-of-malignant-middle-cerebral-artery-infarction-development-and-outcomes
#7
Angelique F Albert, Matthew A Kirkman
BACKGROUND: Optic nerve sheath diameter (ONSD) can predict intracranial hypertension and outcomes in severe traumatic brain injury. Its utility in middle cerebral artery (MCA) stroke is unknown. AIMS: We reviewed serial radiological measurements, including ONSD, in patients with MCA stroke undergoing decompressive craniectomy (DC) for malignant MCA syndrome and compared demographic, clinical, and radiological data with an age- and gender-matched group of nonmalignant MCA stroke patients...
July 20, 2017: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/28727580/increase-in-intracranial-pressure-by-application-of-a-rigid-cervical-collar-a-pilot-study-in-healthy-volunteers
#8
Iscander M Maissan, Rein Ketelaars, Boris Vlottes, Sanne E Hoeks, Dennis den Hartog, Robert J Stolker
OBJECTIVES: Rigid cervical collars are known to increase intracranial pressure (ICP) in severe traumatic brain injury (TBI). Cerebral blood flow might decrease according to the Kellie Monroe doctrine. For this reason, the use of the collar in patients with severe TBI has been abandoned from several trauma protocols in the Netherlands. There is no evidence on the effect of a rigid collar on ICP in patients with mild or moderate TBI or indeed patients with no TBI. As a first step we tested the effect in healthy volunteers with normal ICPs and intact autoregulation of the brain...
July 19, 2017: European Journal of Emergency Medicine: Official Journal of the European Society for Emergency Medicine
https://www.readbyqxmd.com/read/28669033/monitoring-the-brain-after-cardiac-arrest-a-new-era
#9
REVIEW
Niraj Sinha, Sam Parnia
PURPOSE OF REVIEW: Of the approximately 350,000 out-of-hospital, and 750,000 after in-hospital cardiac arrest (CA) events in the US annually approximately 5-9% and 20% respectively may achieve return of spontaneous circulation (ROSC) after attempted cardiopulmonary resuscitation (CPR). Up to 2/3 of these initial survivors may go on die in the subsequent 24-72 hours after ROSC due to a combination of (1) on-going cerebral injury, (2) myocardial dysfunction and (3) massive systemic inflammatory response...
August 2017: Current Neurology and Neuroscience Reports
https://www.readbyqxmd.com/read/28663263/how-common-is-signal-intensity-increase-in-optic-nerve-segments-on-3d-double-inversion-recovery-sequences-in-visually-asymptomatic-patients-with-multiple-sclerosis
#10
T Sartoretti, E Sartoretti, S Rauch, C Binkert, M Wyss, D Czell, S Sartoretti-Schefer
BACKGROUND AND PURPOSE: In postmortem studies, subclinical optic nerve demyelination is very common in patients with MS but radiologic demonstration is difficult and mainly based on STIR T2WI. Our aim was to evaluate 3D double inversion recovery MR imaging for the detection of subclinical demyelinating lesions within optic nerve segments. MATERIALS AND METHODS: The signal intensities in 4 different optic nerve segments (ie, retrobulbar, canalicular, prechiasmatic, and chiasm) were evaluated on 3D double inversion recovery MR imaging in 95 patients with MS without visual symptoms within the past 3 years and in 50 patients without optic nerve pathology...
June 29, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28652823/optic-perineuritis-a-retrospective-case-series
#11
Olle Bergman, Tommy Andersson, Madeleine Zetterberg
Optic perineuritis (OPN) is a rare inflammatory disorder involving the optic nerve sheath characterized by visual loss. OPN may be isolated and idiopathic or part of an underlying disorder. This case series aimed to help clinicians investigate and manage this disorder. Presentation, clinical findings, and treatment of OPN are discussed. After review of medical records at the ophthalmology clinic at Sahlgrenska University hospital in Gothenburg, Sweden, seven OPN patients (three men and four women) were identified and included in the present case series...
2017: International Medical Case Reports Journal
https://www.readbyqxmd.com/read/28649640/mri-derived-diffusion-parameters-in-the-human-optic-nerve-and-its-surrounding-sheath-during-head-down-tilt
#12
Darius A Gerlach, Karina Marshall-Goebel, Khader M Hasan, Larry A Kramer, Noam Alperin, Joern Rittweger
More than half of astronauts present with significant neuro-ophthalmic findings during 6-month missions onboard the International Space Station. Although the underlying cause of this Microgravity Ocular Syndrome is currently unknown, alterations in cerebrospinal fluid dynamics within the optic nerve sheath may play a role. In the presented study, diffusion tensor imaging was used to assess changes in diffusivity of the optic nerve and its surrounding sheath during head-down tilt, a ground-based model of microgravity...
2017: NPJ Microgravity
https://www.readbyqxmd.com/read/28639043/ultrasonographic-optic-nerve-sheath-diameter-for-predicting-elevated-intracranial-pressure-during-laparoscopic-surgery-a-systematic-review-and-meta-analysis
#13
Eun Jung Kim, Bon-Nyeo Koo, Seung Ho Choi, Kyoungun Park, Min-Soo Kim
BACKGROUND: Laparoscopic surgery involves the creation of a carbon dioxide (CO2) pneumoperitoneum to facilitate a clear surgical view, which may result in an elevated intracranial pressure (ICP). Depending on the surgical area, steep Trendelenburg positioning may be used as well, further increasing the ICP. The objective of this study was to assess the effects of laparoscopic surgery on changes in ICP assessed by ultrasonographic measurement of optic nerve sheath diameter (ONSD), which is a generally accepted simple, reliable, and non-invasive ICP measurement technique...
June 21, 2017: Surgical Endoscopy
https://www.readbyqxmd.com/read/28637781/detecting-optic-nerve-head-swelling-on-ultrasound-and-optical-coherence-tomography-in-children-and-young-people-an-observational-study
#14
Annegret Hella Dahlmann-Noor, Gillian W Adams, Moritz Claudius Daniel, Alison Davis, Joanne Hancox, Melanie Hingorani, Patricia Ibanez, Becky McPhee, Himanshu Patel, Marie Restori, Clare Roberts, Maria Theodorou, James Acheson
BACKGROUND: Following high-profile cases, referrals for evaluation of 'suspicious optic discs' to eye clinics in the UK have sharply increased, asking ophthalmologists to reliably distinguish between true and pseudopapilloedema. Optic nerve sheath dilatation (ONSD) on ocular ultrasound (US) is considered a reliable sign of true papilloedema, but this test is not widely available. Recently, anterior bowing of Bruch's membrane (BM) and increased retinal nerve fibre layer thickness on optical coherence tomography (OCT) have emerged as indicators of intracranial hypertension, and OCT is widely available...
June 21, 2017: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/28620004/cancer-and-central-nervous-system-tumor-surveillance-in-pediatric-neurofibromatosis-1
#15
REVIEW
D Gareth R Evans, Hector Salvador, Vivian Y Chang, Ayelet Erez, Stephan D Voss, Kami Wolfe Schneider, Hamish S Scott, Sharon E Plon, Uri Tabori
Although the neurofibromatoses consist of at least three autosomal dominantly inherited disorders, neurofibromatosis 1 (NF1), neurofibromatosis 2 (NF2), and schwannomatosis, NF1 represents a multisystem pleiotropic condition very different from the other two. NF1 is a genetic syndrome first manifesting in childhood; affecting multiple organs, childhood development, and neurocognitive status; and presenting the clinician with often complex management decisions that require a multidisciplinary approach. Molecular genetic testing (see article for detailed discussion) is recommended to confirm NF1, particularly in children fulfilling only pigmentary features of the diagnostic criteria...
June 15, 2017: Clinical Cancer Research: An Official Journal of the American Association for Cancer Research
https://www.readbyqxmd.com/read/28616896/high-resolution-transbulbar-ultrasonography-helping-differentiate-intracranial-hypertension-in-bilateral-optic-disc-oedema-patients
#16
Qian Chen, Weimin Chen, Min Wang, Xinghuai Sun, Yan Sha, Zhenxin Li, Guohong Tian
PURPOSE: The enlargement of optic nerve sheath diameter (ONSD) has been proven to be related with raised intracranial pressure (ICP). No prospective study has been focused on utilizing retrobulbar ultrasonography in optic disc oedema patient presented to ophthalmologist. METHODS: High-resolution transbulbar ultrasonography was performed in a cohort of patient presented with bilateral optic disc oedema. The subarachnoid space of optic nerve (SAS), ONSD and optic nerve diameter (OND) was measured prior to other ancillaries including lumbar puncture...
June 14, 2017: Acta Ophthalmologica
https://www.readbyqxmd.com/read/28611153/effects-of-short-term-mild-hypercapnia-during-head-down-tilt-on-intracranial-pressure-and-ocular-structures-in-healthy-human-subjects
#17
Steven S Laurie, Gianmarco Vizzeri, Giovanni Taibbi, Connor R Ferguson, Xiao Hu, Stuart M C Lee, Robert Ploutz-Snyder, Scott M Smith, Sara R Zwart, Michael B Stenger
Many astronauts experience ocular structural and functional changes during long-duration spaceflight, including choroidal folds, optic disc edema, globe flattening, optic nerve sheath diameter (ONSD) distension, retinal nerve fiber layer thickening, and decreased visual acuity. The leading hypothesis suggests that weightlessness-induced cephalad fluid shifts increase intracranial pressure (ICP), which contributes to the ocular structural changes, but elevated ambient CO2 levels on the International Space Station may also be a factor...
June 2017: Physiological Reports
https://www.readbyqxmd.com/read/28600075/corrigendum-to-optic-nerve-sheath-fenestration-for-idiopathic-intracranial-hypertension-a-seven-year-review-of-visual-outcomes-in-a-tertiary-centre-clin-neurol-neurosurg-137-october-2015-94-101
#18
E E Obi, B K Lakhani, J Burns, R Sampath
No abstract text is available yet for this article.
June 6, 2017: Clinical Neurology and Neurosurgery
https://www.readbyqxmd.com/read/28594302/ectopic-orbital-meningioma-fact-or-fiction
#19
Lee Teak Tan, Christopher M Stewart, Fintan Sheerin, Brendan MacDonald, Priy Silva, Jonathan H Norris
Primary intraorbital ectopic meningiomas are rare and their existence remains controversial. We present a 30-year-old female with painless, non-axial proptosis and a palpable superomedial mass. The MRI demonstrated that the mass had no optic nerve sheath or sphenoid wing involvement and was initially reported to have no intracranial extension. The patient was initially thought to have an ectopic orbital meningioma. Subsequent multidisciplinary team (MDT) consultation and further specialist review of the MRI revealed a subtle dural tail connecting to an enhancing mass in the olfactory groove...
June 2017: Orbit
https://www.readbyqxmd.com/read/28558180/neural-tumors-of-the-orbit-what-is-new
#20
Mark P Ghassibi, Jan P Ulloa-Padilla, Sander R Dubovy
Primary neural tumors of the orbit account for approximately 10% of all orbital tumors. Different tumor entities include meningiomas, optic nerve gliomas, neurofibromas, schwannomas, malignant peripheral nerve sheath tumors, and granular cell tumors. This review summarizes current concepts regarding epidemiology, clinical presentation, diagnosis, pathology, immunohistochemistry, prognosis, and treatment for neural tumors of the orbit based on the available literature.
May 2017: Asia-Pacific Journal of Ophthalmology
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