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Neurovascular imaging

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https://www.readbyqxmd.com/read/28928992/dental-implant-in-the-canalis-sinuosus-a-case-report-and-review-of-the-literature
#1
José Alcides Arruda, Pedro Silva, Luciano Silva, Pâmella Álvares, Leni Silva, Ricardo Zavanelli, Cleomar Rodrigues, Marleny Gerbi, Ana Paula Sobral, Marcia Silveira
The canalis sinuosus is a neurovascular canal, a branch of nerve of infraorbital canal, through which the anterior superior alveolar nerve passes and then leans medially in course between the nasal cavity and the maxillary sinus, reaching the premaxilla in the canine and incisor region. The purpose of this article is to report a case with the presence of canalis sinuosus, in order to alert and guide professionals and discuss the morphology of this anatomical variation avoiding trans- and postsurgical disorders in dental implants...
2017: Case Reports in Dentistry
https://www.readbyqxmd.com/read/28926646/vascular-hypoperfusion-in-acute-optic-neuritis-is-a-potentially-new-neurovascular-model-for-demyelinating-diseases
#2
Ta-Ching Chen, Chao-Yuan Yeh, Chao-Wen Lin, Chung-May Yang, Chang-Hao Yang, I-Hung Lin, Pao-Yang Chen, Jung-Yu Cheng, Fung-Rong Hu
PURPOSE: Optic neuritis is highly correlated with multiple sclerosis and is a major cause of acute visual loss and long-term neuronal degeneration. Primary cerebral hypoperfusion has been reported in brain demyelinating diseases. This study investigated whether peripapillary perfusion is changed in patients with acute optic neuritis (AON). METHODS: This three-year cohort study was conducted from September 1 2012, to August 31, 2015. Two hundred and forty-one patients with non-glaucomatous acute optic neuropathy were screened, and 42 non-highly myopic patients who had suffered their first episode of unilaterally idiopathic AON were studied...
2017: PloS One
https://www.readbyqxmd.com/read/28922275/indications-for-ct-angiography-of-the-vertebral-arteries-after-trauma
#3
Joseph P Drain, Douglas S Weinberg, James S Ramey, Timothy A Moore, Heather A Vallier
STUDY DESIGN: Retrospective. OBJECTIVE: The purpose of this project is to identify factors that predict vertebral artery injury (VAI) in an effort to assess risks and benefits of computed tomography angiography (CT-A) of the neck in the trauma setting. We seek to develop guidelines for practitioners to stratify patients at medium/high risk of VAI from those who are at low risk. SUMMARY OF BACKGROUND DATA: VAI and blunt carotid injury (BCI) together comprise blunt cerebrovascular injury (BCVI)...
September 15, 2017: Spine
https://www.readbyqxmd.com/read/28917813/structural-impacts-on-the-timing-and-amplitude-of-the-negative-bold-response
#4
David Provencher, Alexandre Bizeau, Guillaume Gilbert, Yves Bérubé-Lauzière, Kevin Whittingstall
The positive (PBR) and negative BOLD responses (NBR) arising in task-fMRI display varying magnitudes and dynamics across voxels. While the effects of structure, particularly of veins, on the PBR have been studied, little is known of NBR-structure relationships. Like the PBR, the NBR is often used as a surrogate marker of neuronal activation in both basic and clinical research and assessing its relationship with cortical structure may help interpret group differences. We therefore investigated how local structure affects BOLD amplitude and timing in PBR and NBR areas using multi-band fMRI during visual stimulation to obtain high temporal resolution (TR=0...
September 13, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/28917288/intraoperative-imaging-for-vascular-lesions
#5
REVIEW
Vance L Fredrickson, Jonathan J Russin, Ben A Strickland, Joshua Bakhsheshian, Arun P Amar
Neurovascular surgery is a broad and challenging, yet exciting field within neurologic surgery. The neurovascular surgeon must be meticulous; because the brain and spinal cord are unforgiving to ischemic insults. Along with the pressures of this demanding subspecialty comes the potential to help patients recover from potentially devastating pathology to go on and lead normal, healthy lives. Several intraoperative imaging modalities are available to help maximize treatment success while reducing risk. This article reviews each of these modalities, including digital subtraction angiography, fluorescence angiography, Doppler ultrasonography, laser Doppler, laser speckle contrast imaging, neuronavigation, and neuroendoscopy...
October 2017: Neurosurgery Clinics of North America
https://www.readbyqxmd.com/read/28910382/refining-experimental-dental-implant-testing-in-the-g%C3%A3-ttingen-minipig-using-3d-computed-tomography-a-morphometric-study-of-the-mandibular-canal
#6
Giuliano M Corte, Johanna Plendl, Hana Hünigen, Kenneth C Richardson, Ole Gemeinhardt, Stefan M Niehues
This study reports morphometric and age-related data of the mandibular canal and the alveolar ridge of the Göttingen Minipig to avoid complications during in vivo testing of endosseus dental implants and to compare these data with the human anatomy. Using 3D computed tomography, six parameters of the mandibular canal as well as the alveolar bone height and the alveolar ridge width were measured in Göttingen Minipigs aged 12, 17 and 21 months. Our null hypothesis assumes that the age and the body mass have an influence on the parameters measured...
2017: PloS One
https://www.readbyqxmd.com/read/28904821/endoscopic-transnasal-suprasellar-approach-for-anterior-clinoidal-meningioma-a-case-report-and-review-of-the-literature
#7
Anas M Bardeesi, Saad Alsaleh, Abdulrazag M Ajlan
BACKGROUND: Anterior clinoidal meningiomas (ACM) are traditionally approached through transcranial routes. Due to their tendency to extend laterally and their proximity to vital neurovascular structures, the endoscopic transnasal suprasellar approach is still questionable. We present and describe an ACM case that underwent an endoscopic transnasal suprasellar approach, and provide a review of the literature and operative technique. CASE DESCRIPTION: A 56 year-old lady who presented with chronic left-sided decreased vision...
2017: Surgical Neurology International
https://www.readbyqxmd.com/read/28885295/morphometric-analysis-of-rat-spinal-cord-angioarchitecture-by-phase-contrast-radiography-from-2d-to-3d-visualization
#8
Tianding Wu, Yong Cao, Shuangfei Ni, Zixiang Luo, Liyuan Jiang, Hongbin Lu, Jianzhong Hu
STUDY DESIGN: An advanced imaging of vasculature with synchrotron radiation X-ray in a rat model. OBJECTIVE: To develop the potential for quantitative assessment of vessel network from 2D to 3D visualization by synchrotron radiation X-ray phase contrast tomography (XPCT) in rat spinal cord model. SUMMARY OF BACKGROUND DATA: Investigation of microvasculature contributes to the understanding of pathological development of spinal cord injury...
September 6, 2017: Spine
https://www.readbyqxmd.com/read/28882353/neurophysiological-monitoring-in-radiofrequency-ablation-of-spinal-osteoid-osteoma-with-a-progressive-time-and-temperature-protocol-in-children
#9
Mariano A Nöel, Martin J Segura, Sergio Sierre, Ida A Francheri Wilson, Carlos A Tello, Eduardo Galaretto, Rodrigo G Remondino, María E Talarico, Ernesto S Bersusky, Lucas Piantoni
STUDY DESIGN: Retrospective. Level IV Evidence. OBJECTIVE: To assess the utility of intraoperative neurophysiological monitoring (IONM) to detect and eventually prevent impending neurovascular damage during computed tomography (CT)-guided radiofrequency ablation (RFA) of spinal osteoid osteoma (OO) in children. SUMMARY AND BACKGROUND DATA: To our knowledge, this is the first case series of spinal OO in pediatric patients treated at a single center employing IONM during RFA...
September 2017: Spine Deformity
https://www.readbyqxmd.com/read/28866360/quantitative-assessment-of-mandibular-canal-compression-assessed-by-cone-beam-computed-tomography
#10
Fatima M Jadu, Daniah Alhazmi, Fatma F Badr, Ahmed M Jan
OBJECTIVE: The aim of this study was to objectively quantify the topographic relation of the mandibular canals, impacted third molars, and cortical plates using cone beam computed tomography (CBCT). STUDY DESIGN: A retrospective chart review was conducted using the database of a university-based imaging service. Two calibrated reviewers examined the CBCT images of 100 cases scheduled for mandibular third molar removal. They characterized the position and condition of the mandibular canal and measured its dimensions at 3 different points relative to the third molars...
August 2, 2017: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
https://www.readbyqxmd.com/read/28864913/pancreatic-neuro-insular-network-in-young-mice-revealed-by-3d-panoramic-histology
#11
Shiue-Cheng Tang, Chia-Ning Shen, Pei-Yu Lin, Shih-Jung Peng, Hung-Jen Chien, Ya-Hsien Chou, Chester E Chamberlain, Pankaj J Pasricha
AIMS/HYPOTHESIS: It has been proposed that the neuro-insular network enables rapid, synchronised insulin secretion. However, to date, acquiring the pancreatic tissue map to study the neural network remains a challenging task as there is a lack of feasible approaches for large-scale tissue analysis at the organ level. Here, we have developed 3-dimensional (3D) panoramic histology to characterise the pancreatic neuro-insular network in young mice. METHODS: Pancreases harvested from young wild-type B6 mice (3 and 8 weeks old) and db/db mice (3 weeks old; db/db vs db/+) were used to develop 3D panoramic histology...
September 1, 2017: Diabetologia
https://www.readbyqxmd.com/read/28862552/cavernous-sinus-compartments-from-the-endoscopic-endonasal-approach-anatomical-considerations-and-surgical-relevance-to-adenoma-surgery
#12
Juan C Fernandez-Miranda, Nathan T Zwagerman, Kumar Abhinav, Stefan Lieber, Eric W Wang, Carl H Snyderman, Paul A Gardner
OBJECTIVE Tumors with cavernous sinus (CS) invasion represent a neurosurgical challenge. Increasing application of the endoscopic endonasal approach (EEA) requires a thorough understanding of the CS anatomy from an endonasal perspective. In this study, the authors aimed to develop a surgical anatomy-based classification of the CS and establish its utility for preoperative surgical planning and intraoperative guidance in adenoma surgery. METHODS Twenty-five colored silicon-injected human head specimens were used for endonasal and transcranial dissections of the CS...
September 1, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28860104/valsalva-induced-elevation-of-intracranial-pressure-selectively-decouples-deoxygenated-hemoglobin-concentration-from-neuronal-activation-and-functional-brain-imaging-capability
#13
Martin Knauth, Marcus Heldmann, Thomas F Münte, Georg Royl
During neuronal activation, neurovascular coupling leads to a local decrease of deoxygenated hemoglobin concentration (deoxy-Hb) and thus forms the basis of many functional brain mapping methods. In animals, an elevated intracranial pressure (ICP) can attenuate or even reverse this deoxy-Hb signaling. To study the effect of an elevated ICP on functional brain imaging in humans, we used different breathing tasks to modify ICP and analyzed the resulting effect on neurovascular coupling in the motor cortex. Functional near-infrared spectroscopy (fNIRS) was performed on 45 subjects during alternating conditions of finger tapping and resting state combined with four different breathing maneuvers (normal breathing (NB), breath holding without Valsalva maneuver (BH), Valsalva maneuver with 15 mm Hg forced expiratory pressure against resistance (V15) and Valsalva maneuver with 35 mm Hg forced expiratory pressure against resistance (V35)) in randomized order...
August 30, 2017: NeuroImage
https://www.readbyqxmd.com/read/28855885/laser-doppler-assessment-of-vasomotor-axon-reflex-responsiveness-to-evaluate-neurovascular-function
#14
REVIEW
Marie Luise Kubasch, Anne Sophie Kubasch, Juliana Torres Pacheco, Sylvia J Buchmann, Ben Min-Woo Illigens, Kristian Barlinn, Timo Siepmann
The vasomotor axon reflex can be evoked in peripheral epidermal nociceptive C-fibers to induce local vasodilation. This neurogenic flare response is a measure of C-fiber functional integrity and therefore shows impairment in patients with small fiber neuropathy. Laser Doppler flowmetry (LDF) and laser Doppler imaging (LDI) are both techniques to analyze vasomotor small fiber function by quantifying the integrity of the vasomotor-mediated axon reflex. While LDF assesses the flare response following acetylcholine iontophoresis with temporal resolution at a single defined skin point, LDI records flare responses with spatial and temporal resolution, generating a two-dimensional map of superficial blood flow...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28852792/human-pancreatic-neuro-insular-network-in-health-and-fatty-infiltration
#15
Shiue-Cheng Tang, Luc Baeyens, Chia-Ning Shen, Shih-Jung Peng, Hung-Jen Chien, David W Scheel, Chester E Chamberlain, Michael S German
AIMS/HYPOTHESIS: Identification of a pancreatic neuro-insular network in mice suggests that a similar integration of islets and nerves may be present in the human pancreas. To characterise the neuro-insular network and the intra-pancreatic ganglia in a clinically related setting, we examined human pancreases in health and with fatty infiltration via 3-dimensional (3D) histology and compared the human pancreatic microenvironment with its counterpart in mice. METHODS: Human pancreatic specimens from individuals with normal BMI, high BMI (≥ 25) and type 2 diabetes were used to investigate the neuro-insular network...
August 29, 2017: Diabetologia
https://www.readbyqxmd.com/read/28845380/endovascular-extraction-of-a-needle-from-the-internal-carotid-artery-a-novel-approach-to-a-controversial-dental-misadventure
#16
Jonathan P Giurintano, Jessica Somerville, Merry Sebelik, Daniel Hoit, L Madison Michael, Courtney B Shires
Objective  To review the literature concerning the management of dental needles broken off into the deep spaces of the neck, to report what we believe is the first case of a fractured dental needle migrating into the jugular foramen, and the unconventional use of endovascular intervention to retrieve the needle fragment. Design  Case report with review of literature. Setting  Academic tertiary care center. Participants  Intervention was performed by the otolaryngology-head and neck surgery, vascular surgery, and neurovascular interventional radiology teams...
July 2017: Journal of Neurological Surgery Reports
https://www.readbyqxmd.com/read/28840477/a-working-module-for-the-neurovascular-unit-in-the-sexually-dimorphic-nucleus-of-the-preoptic-area
#17
Zhen He, Li Cui, Sherry A Ferguson, Merle G Paule
The neurovascular unit (NVU) can be conceptualized as a functional entity consisting of neurons, astrocytes, pericytes, and endothelial and smooth muscle cells that operate in concert to affect blood flow to a very circumscribed area. Although we are currently in a "golden era" of bioengineering, there are, as yet, no living NVUs-on-a-chip modules available and the development of a neural chip that would mimic NVUs is a seemingly lofty goal. The sexually dimorphic nucleus of the preoptic area (SDN-POA) is a tiny brain structure (between 0...
August 24, 2017: Molecular Neurobiology
https://www.readbyqxmd.com/read/28840162/simultaneous-functional-near-infrared-spectroscopy-and-electroencephalography-for-monitoring-of-human-brain-activity-and-oxygenation-a-review
#18
REVIEW
Antonio M Chiarelli, Filippo Zappasodi, Francesco Di Pompeo, Arcangelo Merla
Multimodal monitoring has become particularly common in the study of human brain function. In this context, combined, synchronous measurements of functional near-infrared spectroscopy (fNIRS) and electroencephalography (EEG) are getting increased interest. Because of the absence of electro-optical interference, it is quite simple to integrate these two noninvasive recording procedures of brain activity. fNIRS and EEG are both scalp-located procedures. fNIRS estimates brain hemodynamic fluctuations relying on spectroscopic measurements, whereas EEG captures the macroscopic temporal dynamics of brain electrical activity through passive voltages evaluations...
October 2017: Neurophotonics
https://www.readbyqxmd.com/read/28840083/nervus-intermedius-neuralgia-treated-with-microvascular-decompression-a-case-report-and-review-of-the-literature
#19
Takuro Inoue, Ayako Shima, Hisao Hirai, Fumio Suzuki, Masayuki Matsuda
Nervus intermedius neuralgia is one of the craniofacial neuralgias, which is extremely rare compared with trigeminal or glossopharyngeal neuralgia. Despite its unique symptom, the aetiology remains unclear. We present a case of a surgically treated 36-year-old woman who suffered from paroxysmal stabbing deep-ear pain for over 10 years. Preoperative magnetic resonance imaging demonstrated a vascular loop compressing the root entry zone of the vestibulocochlear nerve between the seventh and eighth cranial nerves, suggesting nervus intermedius neuralgia as a cause of her pain...
July 2017: NMC Case Rep J
https://www.readbyqxmd.com/read/28823023/posttraumatic-stress-disorder-symptoms-and-white-matter-abnormalities-among-combat-exposed-veterans
#20
Kirstin Aschbacher, Synthia H Mellon, Owen M Wolkowitz, Clare Henn-Haase, Rachel Yehuda, Janine D Flory, Linda M Bierer, Duna Abu-Amara, Charles R Marmar, Susanne G Mueller
Posttraumatic stress disorder (PTSD) is associated with abnormalities in functional connectivity of a specific cortico-limbic network; however, less is known about white matter abnormalities providing structural connections for this network. This study investigated whether the diagnosis and symptoms of PTSD are associated with alterations in fractional anisotropy (FA), an index reflecting white matter organization, across six, a priori-defined tracts. White matter FA was quantified by diffusion tensor imaging using 3 T-MRI among 57 male, combat-exposed veterans with no history of moderate to severe head injuries or current alcohol dependence: 31 met criteria for PTSD and 26 were demographically comparable, combat-exposed controls without PTSD...
August 19, 2017: Brain Imaging and Behavior
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