Microvascular decompression of the optic chiasm

Elongation of the anterior cerebral artery (ACA) and subsequent compression of the chiasm rarely have been reported as causes of a visual field deficit. Neither has microvascular decompression of the chiasm been described in this circumstance. The authors report on a case of progressive visual deficits caused by compression of the optic apparatus by a right elongated ACA as documented on MR imaging. Microvascular decompression was proposed as treatment. The right A1 segment was larger than usual and tortuous, transmitting its pulsations into the chiasm. A piece of Teflon was inserted between the A1 segment and the chiasm. Following surgery, the visual field deficit progressively improved. At 4 months after surgery, the patient's visual fields were normal. Therefore, an elongated ACA can compress the chiasm and result in a visual field deficit. In such circumstances when facing a progressive visual field deficit, microvascular decompression may improve vision.

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Complete Recovery from Blindness in Case of Compressive Optic Neuropathy due to Unruptured Anterior Cerebral Artery Aneurysm

Case Reports in Ophthalmology ◽

10.1159/000458753 ◽

2017 ◽

Vol 8 (1) ◽

pp. 157-162

Author(s):

Yurie Fukiyama ◽

Hidehiro Oku ◽

Yusuke Hashimoto ◽

Yuko Nishikawa ◽

Masahiro Tonari ◽

...

Keyword(s):

Visual Field ◽

Optic Neuropathy ◽

Cerebral Artery ◽

Anterior Cerebral Artery ◽

Artery Aneurysm ◽

Complete Recovery ◽

Visual Field Defects ◽

Anterior Cerebral Artery Aneurysm ◽

The Right ◽

Cerebral Artery Aneurysm

It is not common for an isolated visual symptom to be the first indication of an aneurysm compressing the optic nerve. The compression can lead to blindness, and a recovery from the blindness is rare. We report a female with a left painless optic neuropathy caused by an unruptured anterior cerebral artery aneurysm. The patient had a temporal hemianopic visual field defect, which progressed to blindness in the left eye, while the right visual function was not affected. A coil embolization of the aneurysm completely restored her visual acuity to 20/20. These findings suggest that aneurysmal lesions should be ruled out in case of unilateral optic neuropathy with hemianopic visual field defects and progressive visual loss.

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Giant Aneurysm Arising from the Anterior Cerebral Artery and Causing an Isolated Homonymous Hemianopsia

Neurosurgery ◽

10.1227/00006123-198803000-00020 ◽

1988 ◽

Vol 22 (3) ◽

pp. 560-563 ◽

Cited By ~ 12

Author(s):

Mark Versavel ◽

Jan P. Witmer ◽

Bart Matricali

Keyword(s):

Visual Field ◽

Cerebral Artery ◽

Anterior Cerebral Artery ◽

Dynamic Assessment ◽

Posterior Part ◽

Giant Aneurysm ◽

Optic Chiasm ◽

Visual Field Examination ◽

Homonymous Hemianopsia ◽

First Case

Abstract A case of a giant aneurysm arising from the anterior cerebral artery and producing a left homonymous hemianopsia is presented. The aneurysm caused lateral compression of the posterior part of the optic chiasm. After preoperative dynamic assessment of the circle of Willis by angiography and by electroencephalographic recording during carotid artery compression, the aneurysm was trapped with microclips on the anterior cerebral artery proximal and distal to it. Visual field examination 6 months postoperatively showed complete visual field recovery. This is the first case of homonymous hemianopsia caused by an angiographically proven giant aneurysm of the ACA. (Neurosurgery 22:560-563, 1988)

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Long-term visual outcome after microsurgical removal of occipital lobe cavernomas

Journal of Neurosurgery ◽

10.3171/2012.5.jns112102 ◽

2012 ◽

Vol 117 (2) ◽

pp. 295-301 ◽

Cited By ~ 10

Author(s):

Juri Kivelev ◽

Elina Koskela ◽

Kirsi Setälä ◽

Mika Niemelä ◽

Juha Hernesniemi

Keyword(s):

Visual Field ◽

Visual Fields ◽

Visual Field Loss ◽

Occipital Lobe ◽

Visual Outcome ◽

Surgical Removal ◽

Long Term Outcome ◽

Visual Field Deficit

Object Cavernomas in the occipital lobe are relatively rare. Because of the proximity to the visual cortex and incoming subcortical tracts, microsurgical removal of occipital cavernomas may be associated with a risk of visual field defects. The goal of the study was to analyze long-term outcome after operative treatment of occipital cavernomas with special emphasis on visual outcome. Methods Of the 390 consecutive patients with cavernomas who were treated at Helsinki University Central Hospital between 1980 and 2011, 19 (5%) had occipital cavernomas. Sixteen patients (4%) were surgically treated and are included in this study. The median age was 39 years (range 3–59 years). Seven patients (56%) suffered from hemorrhage preoperatively, 5 (31%) presented with visual field deficits, 11 (69%) suffered from seizures, and 4 (25%) had multiple cavernomas. Surgery was indicated for progressive neurological deterioration. The median follow-up after surgery was 5.25 years (range 0.5–14 years). Results All patients underwent thorough neuroophthalmological assessment to determine visual outcome after surgery. Visual fields were classified as normal, mild homonymous visual field loss (not disturbing the patient, driving allowed), moderate homonymous visual field loss (disturbing the patient, driving prohibited), and severe visual field loss (total homonymous hemianopia or total homonymous quadrantanopia). At the last follow-up, 4 patients (25%) had normal visual fields, 6 (38%) had a mild visual field deficit, 1 (6%) complained of moderate visual field impairment, and 5 (31%) had severe homonymous visual field loss. Cavernomas seated deeper than 2 cm from the pial surface carried a 4.4-fold risk of postoperative visual field deficit relative to superficial ones (p = 0.034). Six (55%) of the 11 patients presenting with seizures were seizure-free postoperatively. Eleven (69%) of 16 patients had no disability during the long-term follow-up. Conclusions Surgical removal of occipital cavernomas may carry a significant risk of postoperative visual field deficit, and the risk is even higher for deeper lesions. Seizure outcome after removal of these cavernomas appeared to be worse than that after removal in other supratentorial locations. This should be taken into account during preoperative planning.

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On the Relation between Visual Spatial Attention and Visual Field Asymmetries

The Quarterly Journal of Experimental Psychology Section A ◽

10.1080/14640749208401297 ◽

1992 ◽

Vol 44 (3) ◽

pp. 529-555 ◽

Cited By ~ 83

Author(s):

T. A Mondor ◽

M.P. Bryden

Keyword(s):

Visual Field ◽

Visual Attention ◽

Visual Fields ◽

Stimulus Onset ◽

Right Visual Field ◽

Structural Factors ◽

Letter Identification ◽

Functional Capabilities ◽

Visual Spatial ◽

The Right

In the typical visual laterality experiment, words and letters are more rapidly and accurately identified in the right visual field than in the left. However, while such studies usually control fixation, the deployment of visual attention is rarely restricted. The present studies investigated the influence of visual attention on the visual field asymmetries normally observed in single-letter identification and lexical decision tasks. Attention was controlled using a peripheral cue that provided advance knowledge of the location of the forthcoming stimulus. The time period between the onset of the cue and the onset of the stimulus (Stimulus Onset Asynchrony—SOA) was varied, such that the time available for attention to focus upon the location was controlled. At short SO As a right visual field advantage for identifying single letters and for making lexical decisions was apparent. However, at longer SOAs letters and words presented in the two visual fields were identified equally well. It is concluded that visual field advantages arise from an interaction of attentional and structural factors and that the attentional component in visual field asymmetries must be controlled in order to approximate more closely a true assessment of the relative functional capabilities of the right and left cerebral hemispheres.

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Interocular torsional disparity and visual cortical development in the cat

Journal of Neurophysiology ◽

10.1152/jn.1990.64.4.1352 ◽

1990 ◽

Vol 64 (4) ◽

pp. 1352-1360 ◽

Cited By ~ 3

Author(s):

M. R. Isley ◽

D. C. Rogers-Ramachandran ◽

P. G. Shinkman

Keyword(s):

Visual Cortex ◽

Visual Field ◽

Ocular Dominance ◽

Visual Fields ◽

Receptive Fields ◽

Right Visual Field ◽

Orientation Columns ◽

Areas 17 And 18 ◽

The Right ◽

Visual Cortical

1. The present experiments were designed to assess the effects of relatively large optically induced interocular torsional disparities on the developing kitten visual cortex. Kittens were reared with restricted visual experience. Three groups viewed a normal visual environment through goggles fitted with small prisms that introduced torsional disparities between the left and right eyes' visual fields, equal but opposite in the two eyes. Kittens in the +32 degrees goggle rearing condition experienced a 16 degrees counterclockwise rotation of the left visual field and a 16 degrees clockwise rotation of the right visual field; in the -32 degrees goggle condition the rotations were clockwise in the left eye and counterclockwise in the right. In the control (0 degree) goggle condition, the prisms did not rotate the visual fields. Three additional groups viewed high-contrast square-wave gratings through Polaroid filters arranged to provide a constant 32 degrees of interocular orientation disparity. 2. Recordings were made from neurons in visual cortex around the border of areas 17 and 18 in all kittens. Development of cortical ocular dominance columns was severely disrupted in all the experimental (rotated) rearing conditions. Most cells were classified in the extreme ocular dominance categories 1, 2, 6, and 7. Development of the system of orientation columns was also affected: among the relatively few cells with oriented receptive fields in both eyes, the distributions of interocular disparities in preferred stimulus orientation were centered near 0 degree but showed significantly larger variances than in the control condition.(ABSTRACT TRUNCATED AT 250 WORDS)

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Bilateral Glaucomatous Optic Neuropathy Caused by Eye Rubbing

Case Reports in Ophthalmology ◽

10.1159/000439163 ◽

2015 ◽

Vol 6 (3) ◽

pp. 279-283 ◽

Cited By ~ 1

Author(s):

Alfonso Savastano ◽

Maria Cristina Savastano ◽

Laura Carlomusto ◽

Silvio Savastano

Keyword(s):

Intraocular Pressure ◽

Visual Field ◽

Optic Disc ◽

Optic Neuropathy ◽

Correct Diagnosis ◽

Visual Fields ◽

Pattern Electroretinogram ◽

Glaucomatous Optic Neuropathy ◽

Fiber Layer ◽

The Right

In this report, we describe a particular condition of a 52-year-old man who showed advanced bilateral glaucomatous-like optic disc damage, even though the intraocular pressure resulted normal during all examinations performed. Visual field test, steady-state pattern electroretinogram, retinal nerve fiber layer and retinal tomographic evaluations were performed to evaluate the optic disc damage. Over a 4-year observational period, his visual acuity decreased to 12/20 in the right eye and counting fingers in the left eye. Visual fields were severely compromised, and intraocular pressure values were not superior to 14 mm Hg during routine examinations. An accurate anamnesis and the suspicion of this disease represent a crucial aspect to establish the correct diagnosis. In fact, our patient strongly rubbed his eyes for more than 10 h per day. Recurrent and continuous eye rubbing can induce progressive optic neuropathy, causing severe visual field damage similar to the pathology of advanced glaucoma.

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Vocal Reaction Times to Tachistoscopically Presented High- and Low-Frequency Verbs: Some Evidence for Selective Minor Hemisphere Linguistic Analysis

Perceptual and Motor Skills ◽

10.2466/pms.1988.66.3.803 ◽

1988 ◽

Vol 66 (3) ◽

pp. 803-810 ◽

Cited By ~ 12

Author(s):

Michael P. Rastatter ◽

Catherine Loren

Keyword(s):

Visual Field ◽

High Frequency ◽

Right Hemisphere ◽

Visual Fields ◽

Reaction Times ◽

Low Frequency ◽

Normal Subjects ◽

Right Visual Field ◽

Intact Brain ◽

The Right

The current study investigated the capacity of the right hemisphere to process verbs using a paradigm proven reliable for predicting differential, minor hemisphere lexical analysis in the normal, intact brain. Vocal reaction times of normal subjects were measured to unilaterally presented verbs of high and of low frequency. A significant interaction was noted between the stimulus items and visual fields. Post hoc tests showed that vocal reaction times to verbs of high frequency were significantly faster following right visual-field presentations (right hemisphere). No significant differences in vocal reaction time occurred between the two visual fields for the verbs of low frequency. Also, significant differences were observed between the two types of verbs following left visual-field presentation but not the right. These results were interpreted to suggest that right-hemispheric analysis was restricted to the verbs of high frequency in the presence of a dominant left hemisphere.

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The Iatrogenic Development of an Anterior Cerebral Artery Pseudoaneurysm during Lamina Terminalis Fenestration–Genesis, Diagnosis and Therapy: Lessons Learned

Brain Sciences ◽

10.3390/brainsci10060357 ◽

2020 ◽

Vol 10 (6) ◽

pp. 357 ◽

Cited By ~ 1

Author(s):

Robert Bartoš ◽

Jan Lodin ◽

Aleš Hejčl ◽

Martin Sameš ◽

Filip Cihlář

Keyword(s):

Cerebral Artery ◽

Anterior Cerebral Artery ◽

Lessons Learned ◽

Lamina Terminalis ◽

Vascular Injuries ◽

Proper Treatment ◽

Artery Pseudoaneurysm ◽

Potential Risks ◽

The Right ◽

Over Time

Intracranial pseudoaneurysms (PSA) are scarcely presented in the literature. We describe the case of an intracranial PSA on the right anterior cerebral artery, which developed during the complicated surgical treatment of a ruptured right middle cerebral aneurysm. The pseudoaneurysm grew over time and was co-incidentally diagnosed 3 months after the original surgery. The PSA was successfully treated by coiling. In cases of vascular injuries during complicated brain surgery, the timely and careful radiological diagnosis of such a lesion is necessary to allow its fast and proper treatment and thus prevent the patient from potential risks.

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Dissecting Aneurysms of Bilateral Anterior Cerebral Artery Complicated by Subarachnoid Hemorrhage after Cerebral Infarction: A Case Report

Clinical Medicine Case Reports ◽

10.4137/ccrep.s833 ◽

2008 ◽

Vol 1 ◽

pp. CCRep.S833

Author(s):

Akihiro Kurosu ◽

Shizuo Hatashita ◽

Hideo Ueno

Keyword(s):

Subarachnoid Hemorrhage ◽

Cerebral Infarction ◽

Cerebral Artery ◽

Anterior Cerebral Artery ◽

Vascular Reconstruction ◽

Dissecting Aneurysm ◽

Vascular Anastomosis ◽

Left Lower Extremity ◽

The Right ◽

Dissecting Aneurysms

Introduction Intracranial dissecting aneurysms have been increased due to recent advancements in diagnostic imaging. However there have been little article with subarachnoid hemorrhage and cerebral infarction occurring almost at the same time. We performed the surgical treatment and obtained good result. Case presentation A 47-year-old male presented to our hospital with chief complaints of sudden headache and mild paralysis of the left lower extremity. Brain imaging at admission revealed cerebral infarction in the right frontal lobe and subarachnoid hemorrhage in the frontal convexy and anterior interhemispheric fissure. The left and right internal carotid angiography showed a bulging cerebral aneurysm at the left A1–A2 junction and stenosis and arterial dissections in the peripheral of the bilateral anterior cerebral artery. Wrapping was performed for the dissecting aneurysm of the left anterior cerebral artery. For the right anterior cerebral artery, trapping was performed at the A2 segment without vascular anastomosis. The patient's postoperative course was uneventful. Conclusion A consensus has not been reached on the treatment for intracranial dissecting aneurysms. Proximal trapping without vascular reconstruction was performed for the right anterior cerebral artery without vascular anastomosis to prevent rebleeding. However no symptoms of neurological deficiency were observed. Proximal trapping of dissecting aneurysm seems to be a good option when patient's functional and life prognosis are taken into account in case that vascular reconstruction will be anticipated difficulty.

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Backward Contralateral Masking by Light and by Random Pattern

Perceptual and Motor Skills ◽

10.2466/pms.1983.57.1.139 ◽

1983 ◽

Vol 57 (1) ◽

pp. 139-142

Author(s):

Bart Jarvis ◽

Julia Vormbrock ◽

Dennis P. Saccuzzo

Keyword(s):

Visual Field ◽

Target Stimulus ◽

Visual Fields ◽

Random Pattern ◽

Area 17 ◽

Backward Masking ◽

Pattern Mask ◽

Cortex Area ◽

The Right ◽

Contralateral Masking

Letter-stimuli as targets were presented to the right or left visual fields and followed either by a flash of light or by a flash of light plus a patterned mask. The patterned mask always appeared in the opposite visual field of the letter targets. Analysis showed that masking occurred for both types of masks but that subjects produced more errors at each of five intervals between onset of the target and onset of the mask for the flash of light plus a patterned mask in the opposite visual field than for the flash of light alone. A pattern mask, when presented to the opposite visual field of a target stimulus, interferes with target processing at short target-mask intervals. These findings suggest that central backward masking may involve target-mask interactions beyond the visual cortex (Area 17).

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