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The cupped disc. Who needs neuroimaging?
D S Greenfield1, R M Siatkowski, J S Glaser
1Department of Ophthalmology, Bascom Palmer Eye Institute, University of Miami School of Medicine, Florida, USA.
Ophthalmology
|October 27, 1998
Summary
Neuroradiologic evaluation rarely reveals anterior visual pathway compression in normal-tension glaucoma (NTG) patients. Specific clinical signs like vertical visual field defects and optic nerve pallor may indicate intracranial mass lesions.
Area of Science:
- Ophthalmology
- Neurology
- Radiology
Background:
- Normal-tension glaucoma (NTG) can present with optic disc cupping and visual field loss, mimicking compressive lesions.
- Differentiating NTG from intracranial mass lesions is crucial for appropriate patient management.
Purpose of the Study:
- To assess the incidence of positive neuroradiologic findings in patients with NTG.
- To compare clinical and psychophysical characteristics of NTG eyes with those affected by intracranial masses.
Main Methods:
- Retrospective case-controlled study comparing 29 NTG patients with 28 patients with intracranial masses.
- Review of medical records, brain MRI/CT scans, optic nerve photographs, and visual fields.
- Masked assessment of neuroradiologic findings, clinical characteristics, optic nerve appearance, and visual field defects.
Main Results:
- No neuroradiologic evidence of mass lesions was found in the NTG group.
- NTG patients were older, had better visual acuity, greater neuroretinal rim tissue loss, more optic disc hemorrhages, less pallor, and horizontal midline visual field defects.
- Specific indicators for compressive lesions included visual acuity <20/40, vertical visual field defects, optic nerve pallor exceeding cupping, and age <50 years.
Conclusions:
- Anterior visual pathway compression is infrequent in NTG patients.
- Younger age, poorer visual acuity, vertical visual field defects, and optic nerve pallor suggest potential intracranial pathology.