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Functional magnetic resonance imaging of visual function in postpapilledema optic atrophy
1Department of Ophthalmology, Niigata University School of Medicine, Japan.
Summary
A girl with an intraventricular brain tumor experienced severe vision loss but maintained significant visual cortex activity. Functional MRI revealed intact association visual cortex, suggesting its utility in assessing residual vision in such cases.
Area of Science:
- Neuro-oncology
- Ophthalmology
- Neuroimaging
Background:
- Intraventricular brain tumors can lead to optic nerve damage, specifically postpapilledema optic atrophy.
- Severe visual field constriction is a known complication, potentially impacting patient quality of life.
Observation:
- A pediatric patient with an intraventricular brain tumor presented with optic atrophy and profound concentric visual field constriction.
- Despite significant visual field deficits, the patient reported relatively mild subjective visual symptoms.
Findings:
- Functional magnetic resonance imaging (fMRI) revealed preserved bilateral association visual cortex activity.
- Reduced activation was noted in the left calcarine cortex, correlating with the patient's visual symptoms.
- fMRI demonstrated a correlation between visual cortex activity and reported visual function.
Implications:
- fMRI can objectively document residual visual function in patients with severe visual impairment.
- This neuroimaging technique may aid in understanding the disconnect between objective visual loss and subjective experience.
- fMRI offers a valuable tool for managing and assessing visual function in complex neurological cases.