Clinical Course of Optic Nerve Sheath Meningioma

PURPOSE: To evaluate the clinical course of optic nerve sheath meningioma (ONSM) in Korean patients. METHODS: A retrospective study of 11 eyes of 11 patients with a diagnosis of ONSM between 2002 and 2015 at Severance Hospital. RESULTS: The mean age at symptom onset was 47.6 years. Ten females and 1 male participated in the study and all tumors were unilateral. Patients typically presented with visual loss and proptosis. Three patients complained of limited extraocular movements and seven patients exhibited visual field defects. Three patients who had a greater growth rate with intracranial involvement and two patients who had decreased vision received treatments. Five patients maintained good vision and visual field during the follow-up period. However, one patient who underwent surgical treatment presented significant visual loss and deterioration of visual field defect. One out of two patients who received three-dimensional conformal radiotherapy (3D-CRT) experienced improvement in visual field, and the other showed no change in visual field defect but remained stable with decreased tumor size. One out of two patients who underwent gamma-knife surgery showed aggravated visual field defect and the other presented with visual loss. CONCLUSIONS: ONSM is typically a slow-growing tumor. Deterioration of visual loss and visual field defect can occur after treatment of ONSM. Therefore, management should be considered carefully and should be limited to cases in which progression of the disease is advanced or tumor growth is fast. 3D-CRT can be considered in patients in need of treatment.

A rare case of bilateral optic nerve sheath meningioma.

A 60‑year‑old female presented with gradual, painless, progressive diminution of vision, and progressive proptosis of left eye since 7 years. Ophthalmological examination revealed mild proptosis and total optic atrophy in the left eye. Magnetic resonance imaging (MRI) and computed tomography (CT) brain with orbit showed bilateral optic nerve sheath meningioma (ONSM) involving the intracranial, intracanalicular, intraorbital part of the optic nerve extending up to optic chiasma and left cavernous sinus.

Idiopathic Orbital Inflammatory Pseudotumour Mimicking Optic Nerve Sheath Meningioma- A Case Report

A 42-year-old Malay gentleman presented with progressive painless blurring of vision on his left eye associated with ocular ache, redness and increasing proptosis. Examination revealed presence of relative afferent papillary defect with visual acuity of counting finger, and 6/6 on the right eye. Extraocular muscle movement of the left eye was restricted to ten percent in all directions. Computed tomography (CT) and magnetic resonance imaging (MRI) showed enhancing mass occupying the left orbital apex. Diagnosis of optic nerve sheath meningioma was made, and patient subsequently went for radiotherapy. His symptoms subsided completely, until he presented with similar visual complains, and fullness of the upper lid two years later. A repeated MRI showed enlargement of superior and lateral recti muscles with extension to lacrimal gland region. Biopsy of the lacrimal gland revealed inflammatory cells consistent of inflammatory pseudotumor. High dose systemic steroid was instituted, followed by slow tapering of oral steroid. His symptoms completely resolved, and latest visual acuity was 6/9, with no recurrence, to date.

Clinical Features and Management Outcome of Optic Nerve Sheath Meningioma in Korea

PURPOSE: To evaluate the clinical features and treatment results of optic nerve sheath meningioma (ONSM) in Korean patients. METHODS: The present retrospective noncomparative case series was comprised of 10 eyes of 10 patients with a diagnosis of ONSM who were treated between 1997 and 2010 at the Seoul National University Hospital. RESULTS: The mean age at presentation was 47.9 years. Two males and 8 females participated in the study. Decreased vision and proptosis were the most common presenting symptoms. On imaging, the most common pattern was tubular. The most common histopathologic pattern was a meningothelial type. Two patients who were observed maintained good vision during the follow-up period and showed a slow progression of the tumor. Two patients out of 3 who underwent surgical management presented significant visual loss and complications. Three patients in the gamma-knife surgery (GKS) group showed no significant changes in visual acuity after treatment; however, tumor growth was halted. Two patients who underwent 3-dimensional conformal radiotherapy (3D-CRT) presented improvement in their visual acuity or visual field, and tumor growth was halted. CONCLUSIONS: Management should be conservative in most cases because of the slow and indolent growth pattern of ONSM. However, 3D-CRT can be considered as an initial treatment in patients with progressive visual deterioration and having still higher possibility of vision maintenance. GKS can be indicated in patients with progressive visual deterioration and a rare possibility of visual recovery. Surgical indications for ONSM are limited and must be carefully considered for each patient.