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Dural ectasia of the optic nerve sheath in neurofibromatosis type 1: CT and MR features
K O Lövblad1, L Remonda, C Ozdoba
1Department of Neuroradiology, Inselspital, Bern, Swizerland.
Objective:
Optic nerve glioma is a common finding in patients with neurofibromatosis type 1 (NF-1). Although dural ectasia of the optic nerve is encountered rarely, it has to be considered in the differential diagnosis.
Materials And Methods:
Three patients affected by NF-1 were examined sequentially by CT and MRI.
Results:
Computed tomography demonstrated nonprogressing enlargement of the anterior optic pathways. Magnetic resonance imaging displayed widening of the perioptic dural sheath without any suggestion of tumor.
Conclusion:
These findings are compatible with meningocele or dural ectasia of the optic nerve sheath. This entity represents a differential diagnosis to optic glioma in patients with NF-1.