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Homonymous hemianopia

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https://www.readbyqxmd.com/read/29604321/action-blindsight-and-antipointing-in-a-hemianopic-patient
#1
A R Smits, N Seijdel, H S Scholte, C A Heywood, R W Kentridge, E H F de Haan
Blindsight refers to the observation of residual visual abilities in the hemianopic field of patients without a functional V1. Given the within- and between-subject variability in the preserved abilities and the phenomenal experience of blindsight patients, the fine-grained description of the phenomenon is still debated. Here we tested a patient with established "perceptual" and "attentional" blindsight (c.f. Danckert & Rossetti, 2005). Using a pointing paradigm patient MS, who suffers from a complete left homonymous hemianopia, showed clear above chance manual localisation of 'unseen' targets...
March 28, 2018: Neuropsychologia
https://www.readbyqxmd.com/read/29600911/intraoperative-monitoring-with-visual-evoked-potentials-for-brain-surgeries
#2
Eveline M Gutzwiller, Ivan Cabrilo, Ivan Radovanovic, Karl Schaller, Colette Boëx
OBJECTIVE The goal of this study was to determine the performance of intraoperative visual evoked potentials (VEPs) in detecting visual field changes. METHODS Assessments of VEPs were performed with simultaneous retinal responses by using white light-emitting diodes protected from scialytic microscope lights. The alarm criterion was a reproducible decrease in amplitude of the VEP P100 wave of 20% or more. Visual fields were assessed preoperatively and 1 month postsurgery (Goldmann perimetry). RESULTS The VEPs were analyzed for 29 patients undergoing resection of a brain lesion...
March 30, 2018: Journal of Neurosurgery
https://www.readbyqxmd.com/read/29551364/ipsilesional-deficit-of-selective-attention-in-left-homonymous-hemianopia-and-left-unilateral-spatial-neglect
#3
Sylvie Chokron, Carole Peyrin, Céline Perez
AIMS: Patients with homonymous hemianopia may present a subtle ipsilesional deficit, recently referred to as 'sightblindness' in addition to the contralesional visual field defect. We recently demonstrated that this deficit could be worse in right brain-damaged patients with left hemianopia than in left brain-damaged patients with right hemianopia, confirming right hemisphere dominance for visuo-spatial and attentional capacities. In the present study we investigate whether this ipsilesional deficit could be attentional in nature and to what extent it is comparable in right brain-damaged (RBD) patients with left hemianopia and in RBD patients with left neglect...
March 15, 2018: Neuropsychologia
https://www.readbyqxmd.com/read/29538218/neurorehabilitation-of-saccadic-ocular-movement-in-a-patient-with-a-homonymous-hemianopia-postgeniculate-caused-by-an-arteriovenous-malformation-a-case-report
#4
Mirna Pineda-Ortíz, Gustavo Pacheco-López, Moisés Rubio-Osornio, Carmen Rubio, Juan Valadez-Rodríguez
RATIONALE: Visual therapy, which includes a restorative and compensatory approach, seems to be a viable treatment option for homonymous defects of the visual field in patients with postgeniculate injury of the visual pathway, due to occipital arteriovenous malformation (AVM). Until now, the Mexican population suffering from homonymous hemianopia did not have health services that provided any type of visual therapy for their condition. PATIENT CONCERNS: A 31-year-old patient, who underwent a surgical procedure for resection of the AVM, was referred with posterior low vision on the left side...
March 2018: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29525079/comparison-of-clinical-characteristics-among-subtypes-of-visual-symptoms-in-patients-with-transient-ischemic-attack-analysis-of-the-prospective-multicenter-registry-to-identify-subsequent-cardiovascular-events-after-tia-promise-tia-registry
#5
Koji Tanaka, Toshiyuki Uehara, Kazumi Kimura, Yasushi Okada, Yasuhiro Hasegawa, Norio Tanahashi, Akifumi Suzuki, Jyoji Nakagawara, Kazumasa Arii, Shinji Nagahiro, Kuniaki Ogasawara, Shinichiro Uchiyama, Masayasu Matsumoto, Koji Iihara, Kazunori Toyoda, Kazuo Minematsu
BACKGROUND: A transient visual symptom (TVS) is a clinical manifestation of transient ischemic attack (TIA). The aim of this study was to investigate differences in clinical characteristics among subtypes of TVS using multicenter TIA registry data. MATERIALS AND METHODS: Patients with TIA visiting within 7 days of onset were prospectively enrolled from 57 hospitals between June 2011 and December 2013. Clinical characteristics were compared between patients with 3 major subtypes of TVS (transient monocular blindness [TMB], homonymous lateral hemianopia [HLH], and diplopia)...
March 8, 2018: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/29438786/sphenoid-mucocele-with-intracranial-extension-an-anatomical-perspective
#6
G Cossu, R T Daniel, P Francois, C Destrieux, M Messerer
BACKGROUND: Isolated sphenoid mucoceles are rare, but due to their close proximity to important vasculonervous structures, local extension may result in serious consequences. CASE DESCRIPTION: A 47-year old patient presented with headaches, meningismus and a left homonymous lateral hemianopia. We report here the atypical evolution of a post-traumatic sphenoid mucocele invading the sellar region and extending into the subarachnoid space with compression of the right optic tract and we describe its surgical management...
February 10, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29404254/contralateral-minimum-anterior-and-posterior-combined-petrosal-approach-for-retrochiasmatic-craniopharyngiomas-an-alternative-technique
#7
Sachin Ranganatha Goudihalli, Hiroki Morisako, Wimba Prastarana, Takeo Goto, Hiroki Ohata, Kenji Ohata
Retrochiasmatic craniopharyngiomas (RC) are a challenge for the neurosurgeon to treat surgically, restrained by their location in the interpeduncular fossa, surrounded by vital neurovascular structures, narrow corridor and poor visibility. Many approaches are possible and elucidated in the literature, which the surgeon chooses, based on multiple factors, such as the size of tumor, calcification, laterality, preoperative neurological deficits and the endocrine function status, recurrence, postradiotherapy status, or significant superior and/or posterior extension...
February 2018: Journal of Neurological Surgery. Part B, Skull Base
https://www.readbyqxmd.com/read/29404250/extended-endoscopic-endonasal-approach-for-craniopharyngioma-removal
#8
Mahmoud Messerer, Rodolfo Maduri, Roy Thomas Daniel
Objective  Endoscopic transsphenoidal extended endoscopic approach (EEA) represents a valid alternative to microsurgery for craniopharyngiomas removal, especially for retrochiasmatic lesions without large parasellar extension. The present video illustrates the salient surgical steps of the EEA for craniopahryngioma removal. Patient  A 52-year-old man presented with a bitemporal hemianopia and a bilateral decreased visual acuity. MRI showed a Kassam type III cystic craniopharyngioma with a solid component ( Fig...
February 2018: Journal of Neurological Surgery. Part B, Skull Base
https://www.readbyqxmd.com/read/29359111/driving-with-hemianopia-vi-peripheral-prisms-and-perceptual-motor-training-improve-detection-in-a-driving-simulator
#9
Kevin E Houston, Eli Peli, Robert B Goldstein, Alex R Bowers
Purpose: Drivers with homonymous hemianopia (HH) were previously found to have impaired detection of blind-side hazards, yet in many jurisdictions they may obtain a license. We evaluated whether oblique 57Δ peripheral prisms (p-prisms) and perceptual-motor training improved blind-side detection rates. Methods: Patients with HH ( n = 11) wore p-prisms for 2 weeks and then received perceptual-motor training (six visits) detecting and touching stimuli in the prism-expanded vision...
January 2018: Translational Vision Science & Technology
https://www.readbyqxmd.com/read/29351692/homonymous-hemianopia-in-children-and-adolescents-an-mri-study
#10
Manja Haaga, Susanne Trauzettel-Klosinski, Anna Krumm, Stephan Küster, Iliya Ivanov, Angelika Cordey, Claudia Gehrlich, Martin Staudt
AIM:  Diagnosing homonymous hemianopia (HH) in children can be difficult due to inability to comply with perimetry. Therefore, HH can often only be suspected by magnetic resonance imaging (MRI) showing lesions to the retrochiasmatic visual pathways. The aim of our retrospective observational cross-sectional study was to improve the radiologic detection of HH. METHODS:  MRIs of 21 subjects (5-17 years old) with ophthalmologically confirmed HH (14 complete, 7 incomplete hemianopias) were analyzed...
April 2018: Neuropediatrics
https://www.readbyqxmd.com/read/29339960/which-differences-in-priming-effect-between-neglect-and-hemianopia-a-case-description-of-a-bilateral-brain-lesioned-patient
#11
Matteo Sozzi, Stefania Bianchi Marzoli, Lisa Melzi, Massimo Corbo, Irene Venturella, Michela Balconi
It is widely known that visuospatial neglect and hemianopia maybe superimposed. We considered the differences in implicit information processing which is effective in patients with neglect but not with hemianopia. We then hypothesize that a prime-word in the neglected field should determine a semantic activation effect but not in a blind hemifield. Moreover eye movements could provide further details. In this work we considered a patient with a bilateral with the presence of either a left visual neglect and a right homonymous hemianopia...
October 2017: Neuro-ophthalmology
https://www.readbyqxmd.com/read/29201538/vision-in-stroke-cohort-profile-overview-of-visual-impairment
#12
Fiona J Rowe
Aim: To profile the full range of visual disorders from a large prospective observation study of stroke survivors referred by stroke multidisciplinary teams to orthoptic services with suspected visual problems. Methods: Multicenter prospective study undertaken in 20 acute Trust hospitals. Standardized screening/referral forms and investigation forms documented data on referral signs and symptoms plus type and extent of visual impairment. Results: Of 1,345 patients referred with suspected visual impairment, 915 were recruited (59% men; mean age at stroke onset 69 years [SD 14])...
November 2017: Brain and Behavior
https://www.readbyqxmd.com/read/29196364/lesson-of-the-month-2-use-of-thrombolysis-for-ischaemic-stroke-in-pregnancy-a-case-report-and-review-of-literature
#13
Asim Khan, Paris Hosseini, Branimir Nevajda, Sami Khan
A nine-week pregnant 33-year-old female presented with sudden-onset right-sided hemiparesis, hemisensory loss, dysarthria and homonymous hemianopia. She was known to have eleven previous miscarriages and used recreational drugs. A CT-head was unremarkable. The patient was subsequently diagnosed with an acute thromboembolic infarct and chose alteplase after counselling. During thrombolysis an ultrasound identified a foetus with no concerning features.  A post-thrombolysis CT revealed a left-sided posterior cerebral infarct...
December 2017: Clinical Medicine: Journal of the Royal College of Physicians of London
https://www.readbyqxmd.com/read/29075905/vertebrobasilar-dolichoectasia-causing-homonymous-hemianopia-a-case-report-and-review-of-the-literature
#14
Ladina Greuter, Jean-Yves Fournier
A 73-year-old man was diagnosed with an incidental finding of right homonymous hemianopia and presyncopal spells. Magnetic resonance imaging revealed a vertebrobasilar dolichoectasia (VBD) with compression of the left optic tract. VBD is defined as an elongation and dilatation of the basilar artery. Only a few cases have been described in the literature of VBD causing optic tract compression. So far no treatment option has been described for these cases, while surgical options exist for compressions of other cranial nerves, most commonly the trigeminal nerve...
January 2018: Acta Neurochirurgica
https://www.readbyqxmd.com/read/29067219/driving-with-hemianopia-v-do-individuals-with-hemianopia-spontaneously-adapt-their-gaze-scanning-to-differing-hazard-detection-demands
#15
Concetta F Alberti, Robert B Goldstein, Eli Peli, Alex R Bowers
PURPOSE: We investigated whether people with homonymous hemianopia (HH) were able to spontaneously (without training or instructions) adapt their blind-side scan magnitudes in response to differing scanning requirements for detection of pedestrians in a driving simulator when differing cues about pedestrian eccentricities and movement behaviors were available in the seeing hemifield. METHODS: Twelve HH participants completed two sessions in a driving simulator pressing the horn when they detected a pedestrian...
September 2017: Translational Vision Science & Technology
https://www.readbyqxmd.com/read/29018750/management-of-diplopia-with-visual-field-defects
#16
Ling-Yuh Kao, Chun-Hsiu Liu, Meng-Ling Yang
PURPOSE: The management of diplopia can be challenging in patients with a concurrent visual-field (VF) defect. We conducted a retrospective chart review to analyze and compare treatment outcomes for different types of VF defects. METHODS: A retrospective chart review. RESULTS: Seven patients with diplopia and VF defects were identified during the study. Four had bitemporal hemianopia, one had homonymous hemianopia, and two had a constricted central VF...
January 2017: Taiwan Journal of Ophthalmology
https://www.readbyqxmd.com/read/28994265/recognition-of-giant-cell-arteritis-in-patients-with-polymyalgia-rheumatica-who-have-a-stroke-a-cautionary-tale
#17
Donald H Gutteridge, Frank L Mastaglia
An 82-year-old woman with polymyalgia rheumatica (PMR) on prednisone 7 mg daily was admitted to an acute stroke unit with a right homonymous hemianopia, a left posterior cerebral artery occlusion and occipital lobe infarct. She had raised inflammatory markers, did not have a temporal artery biopsy, and was discharged on the same dose of prednisone. After 21 months, off prednisone, her ophthalmologist, concerned about giant cell arteritis (GCA), restarted prednisone 40 mg daily, with rapid, profound visual improvement...
October 2017: Internal Medicine Journal
https://www.readbyqxmd.com/read/28980562/-structural-retinal-and-optic-nerve-changes-in-patients-with-post-geniculate-visual-pathway-damage
#18
N M Eliseeva, N K Serova, V P Erichev, L A Panyushkina
AIM: To establish the possibility of retrograde trans-synaptic neural degeneration following acquired post-geniculate visual pathway damage. MATERIAL AND METHODS: Twenty-two patients with homonymous hemianopia caused by acquired post-geniculate visual pathway damage were examined. Peripapillary retinal nerve fiber layer (RNFL) thickness and ganglion cell complex (GCC) measurements were assessed with RTVue-100 Fourier-domain optical coherence tomography (OCT). RESULTS: In 12 out of 22 patients we detected binocular GCC thinning that was ipsilateral to post-geniculate involvement...
2017: Vestnik Oftalmologii
https://www.readbyqxmd.com/read/28954971/incongruous-incomplete-homonymous-hemianopia-due-to-an-infarction-localized-to-the-lateral-geniculate-body
#19
Kanta Tanaka, Ikko Wada, Toshihiko Suenaga
A 45-year-old male was admitted with an acute-onset visual field defect. Goldmann perimetry revealed an incongruent, incomplete right homonymous hemianopia. The left eye showed a wedge-shaped, horizontal right hemianopia, whereas the right eye showed constriction of the right visual hemifield. MRI showed acute infarction localized to the left lateral geniculate body (LGB). LGB has a dual blood supply: from the anterior choroidal artery and from the lateral posterior choroidal artery (LPChA). The LPChA territory of LGB receives projection from the retinal area around the macula and horizontal meridian...
October 27, 2017: Rinshō Shinkeigaku, Clinical Neurology
https://www.readbyqxmd.com/read/28932016/transcranial-direct-current-stimulation-tdcs-combined-with-blindsight-rehabilitation-for-the-treatment-of-homonymous-hemianopia-a-report-of-two-cases
#20
Barbara Maria Matteo, Barbara Viganò, Cesare Giuseppe Cerri, Roberto Meroni, Cesare Maria Cornaggia, Cecilia Perin
[Purpose] Homonymous hemianopia is one of the most common symptoms following neurologic damage leading to impairments of functional abilities and activities of daily living. There are two main types of restorative rehabilitation in hemianopia: "border training" which involves exercising vision at the edge of the damaged visual field, and "blindsight training," which is based on exercising the unconscious perceptual functions deep inside the blind hemifield. Only border effects have been shown to be facilitated by transcranial direct current stimulation (tDCS)...
September 2017: Journal of Physical Therapy Science
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