Optic nerve glioma: neurofibromatosis type 1
Gradual loss of vision.
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MRI of the brain demonstrates enlargement and enhancement of the optic apparatus, including the posterior optic nerves, optic chiasm, optic tracts and into the midbrain and basal ganglia.
The pituitary gland can be seen as separate to the mass which pushes down upon it.
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This case illustrates the typical appearances of an extensive optic pathway glioma in a child with known NF1.