Presentation
Right proptosis and visual loss
Patient Data
Age: 35 years
Gender: Male
From the case:
Optic pilocytic astrocytoma
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There is a retrobulbar mass lesion involving right optic nerve, that shows T1-WI low signal and T2-WI high signal intensity and avid enhancement on post contrast images.
Case Discussion
Microscopic evaluation and immunohistochemistry reflect G-FAP positive astrocytic differentiation, compatible with Pilocytic astrocytoma.
Hemangiopericytoma is said in differential diagnosis.
This is an example of sporadic optic nerve pilocytic astrocytoma not associated with NF1.