scholarly journals Optic Nerve Sheath Distention as a Protective Mechanism Against the Visual Impairment and Intracranial Pressure Syndrome in Astronauts

2017 ◽  
Vol 58 (11) ◽  
pp. 4601 ◽  
Author(s):  
Peter Wostyn ◽  
Peter Paul De Deyn
Keyword(s):  
Optic Nerve ◽  
Intracranial Pressure ◽  
Visual Impairment ◽  
Optic Nerve Sheath ◽  
Protective Mechanism ◽  
Nerve Sheath

The Coexistence of Olfactory Groove with Optic Nerve Sheath Meningioma Presenting with Anosmia: Case Report

2020 ◽  
Vol 16 ◽  
Author(s):  
Hatice Ferhan Kömürcü ◽  
Gıyas Ayberk ◽  
Ömer Anlar
Keyword(s):  
Case Report ◽  
Optic Nerve ◽  
Visual Impairment ◽  
Optic Nerve Sheath ◽  
Olfactory Groove ◽  
Nerve Sheath ◽  
Optic Nerve Sheath Meningioma ◽  
History Of ◽  
Olfactory Groove Meningioma ◽  
Memory Disturbance

Introduction: Meningiomas are the third most common intracranial tumors in adults after glial tumors and metastases. Olfactory groove meningiomas often grow without symptoms due to their slow growth rates and location in the frontal lobe. Optic nerve sheath meningiomas are benign neoplasms of the meninges surrounding the optic nerve. The coexistence of olfactory groove and optic nerve sheath meningiomas without any history of neurofibromatosis or radiotherapy has never been reported in the literature. Case Report: A 36-year-old female patient presenting with anosmia, headache, memory disturbance, and visual impairment and operated with the diagnosis of olfactory groove meningioma was reported. In the postoperative period, optic nerve sheath meningioma was detected in the imaging performed due to the persistence of visual impairment. Conclusion: Olfactory groove and optic nerve sheath meningiomas are rare tumors and can be diagnosed late because they progress slowly. Early diagnosis and treatment may affect the prognosis and morbidity of these patients favorably.

scholarly journals Migraine or idiopathic intracranial hypertension: Magnetic resonance venography and magnetic resonance imaging findings

2020 ◽  
Vol 33 (3) ◽  
pp. 244-251
Author(s):  
Aynur Guliyeva ◽  
Melda Apaydin ◽  
Yesim Beckmann ◽  
Gulten Sezgin ◽  
Fazil Gelal
Keyword(s):  
Magnetic Resonance Imaging ◽  
Optic Nerve ◽  
Magnetic Resonance ◽  
Intracranial Pressure ◽  
Pituitary Gland ◽  
Optic Nerve Sheath ◽  
Imaging Findings ◽  
Resonance Imaging ◽  
Chi Square ◽  
Nerve Sheath

Background Idiopathic intracranial hypertension (IIH) is a disease characterised by increased cerebral pressure without a mass or hydrocephalus. We aimed to differentiate migraine and IIH patients based on imaging findings. Results Patients with IIH ( n = 32), migraine patients ( n = 34) and control subjects ( n = 33) were evaluated. Routine magnetic resonance imaging, contrast-enhanced 3D magnetic resonance venography and/or T1-weighted 3D gradient-recalled echo were taken with a 1.5 T magnetic resonance scanner. Optic-nerve sheath distention, flattened posterior globe and the height of the pituitary gland were evaluated in the three groups. Transverse sinuses (TS) were evaluated with respect to score of attenuation/stenosis and distribution. Pearson chi-square, Fisher’s exact test and chi-square trend statistical analyses were used for comparisons between the groups. A p-value of <0.05 was considered statistically significant. Decreased pituitary gland height, optic-nerve sheath distention and flattened posterior globe were found to be statistically significant ( p < 0.001) in IIH patients. Bilateral TS stenosis was also more common in IIH patients than in the control group and migraine group ( p = 0.02). Conclusion Decreased pituitary gland height, optic-nerve sheath distention, flattened posterior globe, bilateral stenosis and discontinuity in TS are significant findings in differentiating IIH cases from healthy individuals and migraine patients. Bilateral TS stenosis may be the cause rather than the result of increased intracranial pressure. The increase in intracranial pressure, which is considered to be responsible for the pathophysiology of IIH, is not involved in the pathophysiology of migraine.

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