'Pilocytic astrocytoma' is a brain tumor that occurs predominantly in children and involves the midline, basal and posterior
fossa structures. It is generally considered a
benign tumor of childhood. It is often
cystic and if solid, it tends to be well circumscribed. It is characteristically a contrast enhancing tumour by current imaging investigations (e.g.
CT scan,
MRI)
Microscopically, the tumor is composed of bipolar cells with long "hairlike"
GFAP-positive processes.
Rosenthal fibers,
eosinophilic granular bodies and microcysts are often present.
It is classified as 'Grade 1
Astrocytoma'.
External links
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Medical Image Database
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UC
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fightJPA - An Organization Dedicated to Funding Research into Juvenile Pilocytic Astrocytoma