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[Nerve fibre bundle defects in a pre-chiasmal lesion]
I Mildenberger1, W Lagrèze, U Schiefer
1Abt. für Pathophysiologie des Sehens und Neuroophthalmologie, Universitäts-Augenklinik Tübingen, Schleichstrasse 12-16, 72076 Tübingen. Ingrid.Mildenberger@med.uni-tuebingen.de
Prechiasmal lesions can cause distinct visual field defects, even affecting nerve fiber bundles. This case highlights their importance in diagnosing conditions like sphenoid meningioma and differentiating from glaucoma.
Area of Science:
- Ophthalmology
- Neurology
Background:
- Prechiasmal lesions of the visual pathway typically cause visual field defects respecting the vertical meridian.
- These defects may affect one eye or present differently in both eyes.
Observation:
- A case report details a 67-year-old patient with a sphenoid meningioma extending into the optic canal.
- Visual field examination revealed an inferior altitudinal nerve fiber bundle defect.
Findings:
- The retinal nerve fiber pattern remains intact approaching the optic chiasm.
- Nerve fiber bundle defects can occur in prechiasmal lesions.
Implications:
- Nerve fiber bundle defects should be considered in the differential diagnosis of prechiasmal lesions.
- This finding is relevant for conditions such as suspected low-tension glaucoma.
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