ARACHNOID CYST OF THE INTRAORBITAL PORTION OF THE OPTIC NERVE WITH UNILATERAL DISC OEDEMA AND TRANSIENT SHALLOWING OF THE ANTERIOR CHAMBER

Abstract
An unusual occurrence of chronic monocular disc edema, visual loss and shallowing of the anterior chamber in a patient with an arachnoid cyst involving a portion of the intraorbital optic nerve was reported. Decompression of the optic nerve sheath through a Kroenlein approach was followed by prompt deepening of the anterior chamber and a gradual, delayed relief of the disc edema. Orbitotomy and decompression of the optic nerve sheath should be done before atrophic changes of the optic nerve and visual loss begin to develop.

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