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CORRESPONDING AUTHOR Michał Post, MD, PhD, FEBO, 2nd Chair and Department of Ophthalmology, Pomeranian Medical University in Szczecin, 72 Powstańców Wlkp. Avenue, 70-111 Szczecin, Poland, e-mail: info@okulistapost.pl INTRODUCTION Optic nerve sheath meningioma (ONSM) is a rare, benign tumour originating from meningothelial cells of the meninges surrounding the optic nerve. It represents 1/3 of primary optic nerve tumours [1]. Over 90% of ONSM cases are secondary to central nervous system (CNS) tumours [2, 3]. Optic nerve sheath meningioma, despite being considered a benign tumour, results in gradual deterioration of vision, due to compression of the optic nerve and vessels supplying it. The tumour is usually unilateral (95%) and is three times more common in women than in men [2]. Mean age of onset of the disease is 41 years. Only 4% of optic nerve sheath meningiomas occur at the age of < 20 years, according to Dutton. A set of symptoms, known as the Hoyt-Spencer triad, is typical for ONSM: 1) painless, gradual deterioration of vision, 2) atrophy/oedema of optic disc, 3) retino-ciliary leakage. Optic nerve sheath meningioma may cause visual field defects of any type and affect the appearance of the optic disc. This is particularly important in patients with chronic optic nerve diseases, e.g. glaucoma. To date, there is only one case of concomitant optic nerve sheath meningioma resulting in progression of visual field defects in a glaucoma patient described in the literature [4]. In this paper the authors present, for the first time, the case of an ONSM patient who underwent the trabeculectomy procedure complicated with chronic hypotony. The authors analyse the potential effect of ONSM on the course of glaucoma and post-trabeculectomy complications.

Can optic nerve sheath meningioma affect the post-operative course after trabeculectomy? – case report