Abstract
Introduction. Olfactory groove meningiomas cause progressive compression of the frontal lobes with posterior projection towards the sella turcica. If large enough, these tumors may cause optic nerve compression and optic chiasm. The aim of this study was to determine whether optical coherence tomography, as a method that objectively measures the thickness of retinal nerve fiber layer and retinal ganglion cell complex thickness, provides a realistic assessment of the postoperative visual outcome in chronic chiasmal compression caused by olfactory groove meningioma. Case Report. A 55-year-old woman presented with an eight month history of malaise, weakness, frontal headaches, anosmia, and blurred vision in both eyes. Magnetic resonance imaging of the endocranium revealed a large olfactory groove meningioma extending into the prechiasmal portion of the optic nerves and optic chiasm with a marked compressive effect. The mean preoperative retinal nerve fibre layer thickness was 65 ?m in the right eye and 63 ?m in the left eye. Ten months after surgery, the mean retinal nerve fibre layer thickness was 67 ?m in the right eye and 63 ?m in the left eye. The mean preoperative ganglion cell complex thickness was 57 ?m in the right eye, while it could not be measured in the left eye due to loss of fixation. Ten months after surgery, the mean ganglion cell complex thickness was 56 ?m in the right eye and 48 ?m in the left eye. The obtained values were significantly lower than the physiologic thickness values. Conclusion. Retinal nerve fibre layer thickness and ganglion cell complex thickness measured by optical coherence tomography represent a valid prognostic indicator of visual outcome and recovery after surgical decompression of the optic chiasm.
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