Post-decompression optic neuropathy

1985 ◽  
Vol 63 (2) ◽  
pp. 196-199 ◽  
Author(s):  
Roy W. Beck ◽  
Harry S. Greenberg
Keyword(s):  
Optic Nerve ◽  
Visual Field ◽  
Optic Neuropathy ◽  
Fiber Bundle ◽  
Visual Field Loss ◽  
Intracranial Tumors ◽  
Visual Recovery ◽  
Content Type ◽  
Decompressive Craniotomy ◽  
Fine Print

✓ Blindness resulting from a decompressive craniotomy is uncommon. Five patients with intracranial tumors and papilledema who developed a bilateral optic neuropathy during an apparently uncomplicated craniotomy are presented. Symptoms of visual field loss were minimal preoperatively in four. Visual recovery in general was poor. The nerve fiber bundle pattern of visual field loss in these cases implicates the optic disc as the site of damage in this disorder. It is postulated that hypoperfusion to the prelaminar portion of the optic nerve is the underlying cause.

Optic nerve ganglioglioma

1993 ◽  
Vol 78 (6) ◽  
pp. 979-982 ◽  
Author(s):  
William Y. Lu ◽  
Marc Goldman ◽  
Byron Young ◽  
Daron G. Davis
Keyword(s):  
Magnetic Resonance Imaging ◽  
Nervous System ◽  
Optic Nerve ◽  
Magnetic Resonance ◽  
Visual Field ◽  
Resonance Imaging ◽  
Optic Nerve Glioma ◽  
Content Type ◽  
Visual Field Deficit ◽  
Fine Print

✓ Gangliogliomas of the optic nerve are extremely rare. The case is reported of a 38-year-old man who presented with a visual field deficit and was discovered to have an optic nerve ganglioglioma. The possible embryological origins of this neoplasm, its histological and immunohistochemical features, and its appearance on magnetic resonance imaging are examined. The prognoses of optic nerve glioma and of gangliogliomas occurring elsewhere in the nervous system are compared.

Dose fractionation in stereotactic radiotherapy for parasellar meningiomas: radiobiological considerations of efficacy and optic nerve tolerance

2004 ◽  
pp. 390-395 ◽  
Author(s):  
Dennis C. Shrieve ◽  
Lisa Hazard ◽  
Kenneth Boucher ◽  
Randy L. Jensen
Keyword(s):  
Single Dose ◽  
Optic Nerve ◽  
Optic Neuropathy ◽  
Dose Fractionation ◽  
Benign Meningioma ◽  
Content Type ◽  
Fractionated Radiotherapy ◽  
Statistical Estimates ◽  
Fine Print

Object. Benign meningiomas have been shown to be equally well controlled with single-dose radiosurgery (15 Gy) and fractionated doses of 54 Gy in 30 fractions after adequate follow up. For a subset of patients with meningioma, the optic apparatus is dose limiting when considering single-dose stereotactic radiosurgery, with tolerance estimated to be 8 to 10 Gy. Recently, hypofractionated regimens have been used to treat benign meningiomas with a small number of fractions. An analysis of the expected efficacy of hypofractionation compared with the estimated optic tolerance to fractionated radiotherapy was undertaken. Methods. Using the assumption that 15 Gy in one fraction and 54 Gy in 30 fractions are isoeffective for control of benign meningioma, an α/β for meningioma is calculated to be 3.28 Gy. Invoking a 10% error for these doses (15 Gy ± 10% is equivalent to 54 Gy ± 10%) results in upper and lower limits of the estimate for α/β of 3.85 Gy and 2.7 Gy. Using these estimates, isoeffect curves for control of meningioma were constructed for fraction numbers of one to 45. Best estimates of optic nerve/chiasm tolerance to single doses of radiation are 8 to 10 Gy, with the reported incidence of optic neuropathy increasing significantly at higher doses. This is consistent with the optic ret model, which also predicts for optic tolerance following fractionated radiotherapy. Comparison of optic tolerance and estimates of efficacious doses at fraction numbers between one and 30 were made. Statistical estimates of patient numbers and duration of follow up required to rule out optic neuropathy following radiotherapy were made. Single doses of radiation required to treat benign meningioma optimally (13.5–16.5 Gy) clearly exceed the estimated and reported clinical tolerance of the optic nerves and chiasm. The application of equivalent biological doses in a small number of fractions continues to exceed optic tolerance until at least 25 fractions are applied. Conclusions. The use of small numbers of fractions to treat patients with meningioma when portions of optic nerve or chiasm receive full dose may result in undertreatment of the tumor and/or exceeding optic nerve tolerance. In such cases standard fractionation is recommended. Ruling out a low, yet unacceptable, risk of optic neuropathy may require the close study of many patients with long-term follow-up evaluation.

Dose fractionation in stereotactic radiotherapy for parasellar meningiomas: radiobiological considerations of efficacy and optic nerve tolerance

2004 ◽  
Vol 101 (Supplement3) ◽  
pp. 390-395 ◽  
Author(s):  
Dennis C. Shrieve ◽  
Lisa Hazard ◽  
Kenneth Boucher ◽  
Randy L. Jensen
Keyword(s):  
Single Dose ◽  
Optic Nerve ◽  
Optic Neuropathy ◽  
Dose Fractionation ◽  
Benign Meningioma ◽  
Content Type ◽  
Fractionated Radiotherapy ◽  
Statistical Estimates ◽  
Fine Print

Object. Benign meningiomas have been shown to be equally well controlled with single-dose radiosurgery (15 Gy) and fractionated doses of 54 Gy in 30 fractions after adequate follow up. For a subset of patients with meningioma, the optic apparatus is dose limiting when considering single-dose stereotactic radiosurgery, with tolerance estimated to be 8 to 10 Gy. Recently, hypofractionated regimens have been used to treat benign meningiomas with a small number of fractions. An analysis of the expected efficacy of hypofractionation compared with the estimated optic tolerance to fractionated radiotherapy was undertaken. Methods. Using the assumption that 15 Gy in one fraction and 54 Gy in 30 fractions are isoeffective for control of benign meningioma, an α/β for meningioma is calculated to be 3.28 Gy. Invoking a 10% error for these doses (15 Gy ± 10% is equivalent to 54 Gy ± 10%) results in upper and lower limits of the estimate for α/β of 3.85 Gy and 2.7 Gy. Using these estimates, isoeffect curves for control of meningioma were constructed for fraction numbers of one to 45. Best estimates of optic nerve/chiasm tolerance to single doses of radiation are 8 to 10 Gy, with the reported incidence of optic neuropathy increasing significantly at higher doses. This is consistent with the optic ret model, which also predicts for optic tolerance following fractionated radiotherapy. Comparison of optic tolerance and estimates of efficacious doses at fraction numbers between one and 30 were made. Statistical estimates of patient numbers and duration of follow up required to rule out optic neuropathy following radiotherapy were made. Single doses of radiation required to treat benign meningioma optimally (13.5–16.5 Gy) clearly exceed the estimated and reported clinical tolerance of the optic nerves and chiasm. The application of equivalent biological doses in a small number of fractions continues to exceed optic tolerance until at least 25 fractions are applied. Conclusions. The use of small numbers of fractions to treat patients with meningioma when portions of optic nerve or chiasm receive full dose may result in undertreatment of the tumor and/or exceeding optic nerve tolerance. In such cases standard fractionation is recommended. Ruling out a low, yet unacceptable, risk of optic neuropathy may require the close study of many patients with long-term follow-up evaluation.

scholarly journals Amiodarone-Associated Optic Neuropathy

2018 ◽  
Vol 80 (4) ◽  
pp. 33-64
Author(s):  
Sara L. Weidmayer
Keyword(s):  
Optic Nerve ◽  
Visual Field ◽  
Optic Neuropathy ◽  
Visual Function ◽  
Temporal Relationship ◽  
Visual Field Loss ◽  
Fiber Layer ◽  
Permanent Loss ◽  
Inferior Quadrant ◽  
Insight Into

A 72-year old male presented symptomatic for unilateral inferior visual field loss, but was found to have bilateral optic neuropathy. Clinical features, an extended minimally symptomatic course and a temporal relationship to amiodarone use implicated amiodarone-associated optic neuropathy.  Serial ancillary testing analyses provided insight into this entity’s natural course.  This patient developed the greatest retinal nerve fiber layer thinning in the inferior quadrant; this may correlate with anatomically larger-diameter axons, supporting a previous publication which suggested that larger-diameter optic nerve axons are more susceptible to amiodarone-induced lipidosis. While rare, amiodarone-associated optic neuropathy may develop and cause permanent loss of visual function.

scholarly journals Revisiting the Awareness and Understanding the Associations between Intracranial Tumors and Optic Neuropathy

Diagnostics ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 2374
Author(s):  
Tomasz Żarnowski ◽  
Urszula Łukasik ◽  
Iwona Żarnowska ◽  
Ewa Kosior-Jarecka
Keyword(s):  
Optic Nerve ◽  
Visual Field ◽  
Retrospective Analysis ◽  
Color Vision ◽  
Optic Neuropathy ◽  
Clinical Picture ◽  
Wide Spectrum ◽  
Differential Diagnostics ◽  
Intracranial Tumors ◽  
Clinical Scenarios

The aim of this paper is to report clinically various cases of intracranial tumors in patients referred to glaucoma clinic for consultation. The secondary aim was to increase the awareness of intracranial tumors in atypical cases of glaucoma. We present the retrospective analysis of five patients referred to glaucoma clinic for consultation. Due to atypical course of the disease, in addition to standard glaucoma examinations, all patients had a neurologic full visual field, color vision, and MRI done. In all patients, intracranial malignancies were found, some patients underwent surgery of the lesions with consecutive clinical improvements. Interestingly, in some patients, coexisting glaucoma was diagnosed. Patients were selected deliberately to present a wide spectrum of possible clinical scenarios when glaucoma may be complicated by intracranial tumors. Sometimes, the relevance of intracranial tumors with respect to their influence on the clinical picture of the optic nerve cannot be established. To conclude, in the “atypical cases of glaucoma” the assessment of the optic nerve may indicate the necessity of neuroimaging in differential diagnostics.

Visual changes after gamma knife surgery for optic nerve tumors

2005 ◽  
Vol 102 (Special_Supplement) ◽  
pp. 143-146 ◽  
Author(s):  
Yang Kwon ◽  
Jun Seok Bae ◽  
Jae Myung Kim ◽  
Do Hee Lee ◽  
Soon Young Kim ◽  
...  
Keyword(s):  
Optic Nerve ◽  
Gamma Knife ◽  
Gamma Knife Surgery ◽  
Optic Glioma ◽  
Content Type ◽  
Nerve Sheath ◽  
Optic Nerve Sheath Meningioma ◽  
Optic Nerve Tumors ◽  
Visual Changes ◽  
Fine Print

✓ Tumors involving the optic nerve (optic glioma, optic nerve sheath meningioma) are benign but difficult to treat. Gamma knife surgery (GKS) may be a useful treatment. The authors present data obtained in three such cases and record the effects of GKS.

The deposition of Hg203-chlormerodrin in experimental brain tumors

1971 ◽  
Vol 35 (3) ◽  
pp. 303-308 ◽  
Author(s):  
Tatsuya Kobayashi ◽  
Louis Bakay ◽  
Joseph C. Lee
Keyword(s):  
Brain Tumors ◽  
Tumor Cells ◽  
Normal Brain ◽  
Intracranial Tumors ◽  
Electron Microscopic ◽  
Electron Microscopic Autoradiography ◽  
Content Type ◽  
Meningeal Tumors ◽  
Vacuolar System ◽  
Fine Print

✓ The deposition of Hg203-chlormerodrin was studied in intracranial tumors in mice induced by implantation of 20-methyl cholanthrene by tissue assay, as well as light microscopic and electron microscopic autoradiography. The investigations were carried out in astrocytomas, glioblastomas, and meningeal tumors. The chlormerodrin content of the tumors exceeded that of normal brain with a significant tumor/brain ratio ranging from 5.8 to 22.5. It was found that the chlormerodrin molecule becomes rapidly incorporated in the tumor cells, with a preference for that portion of the cytoplasm associated with the vacuolar system.

Neuroepithelial cyst in the optic nerve

1987 ◽  
Vol 67 (1) ◽  
pp. 137-139 ◽  
Author(s):  
Alberto Isla ◽  
José Palacios ◽  
José M. Roda ◽  
Manuel Gutierrez ◽  
Cesáreo González ◽  
...  
Keyword(s):  
Optic Nerve ◽  
Computerized Tomography ◽  
Cystic Lesion ◽  
Histological Study ◽  
Content Type ◽  
Neuroepithelial Cyst ◽  
Loss Of Vision ◽  
Progressive Loss ◽  
Suprasellar Region ◽  
Fine Print

✓ A 34-year-old woman presented with progressive loss of vision in her left eye of 2 months' evolution. Computerized tomography showed a hypodense lesion in the suprasellar region. At surgery a cystic lesion was found inside the optic nerve. Histological study proved it to be a neuroepithelial cyst. The pathogenesis of a neuroepithelial cyst in such an exceptional site is discussed.

Visual loss from optochiasmatic arachnoiditis after tuberculous meningitis

1977 ◽  
Vol 46 (4) ◽  
pp. 524-526 ◽  
Author(s):  
R. Michael Scott ◽  
Volker K. H. Sonntag ◽  
Lloyd M. Wilcox ◽  
Lester S. Adelman ◽  
Thomas H. Rockel
Keyword(s):  
Tuberculous Meningitis ◽  
Visual Loss ◽  
Visual Recovery ◽  
Optic Nerves ◽  
Content Type ◽  
Visual Deficit ◽  
Fine Print

✓ While recovering from tuberculous meningitis, a 5-year-old boy developed a profound visual deficit because of optochiasmatic arachnoiditis. Following micro-neurosurgical decompression of the optic nerves and chiasm, prompt visual recovery occurred.

Intraorbital optic nerve hemangioblastoma with von Hippel-Lindau disease

1982 ◽  
Vol 56 (3) ◽  
pp. 426-429 ◽  
Author(s):  
Seiich In ◽  
Jun Miyagi ◽  
Nobuto Kojho ◽  
Shinken Kuramoto ◽  
Masaki Uehara
Keyword(s):  
Optic Nerve ◽  
Content Type ◽  
Von Hippel Lindau ◽  
Von Hippel Lindau Disease ◽  
Dural Attachment ◽  
Microscopic Findings ◽  
Fine Print

✓ An intraorbital hemangioblastoma of the optic nerve is reported in a 23-year-old woman with von Hippel-Lindau disease. The absence of dural attachment and the microscopic findings were characteristic of hemangioblastoma. Four years later the patient developed a cystic hemangioblastoma in the left cerebellum which was successfully treated.

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