The uniformly good prognosis of the JPA is often lost, when this
lesion presents in less resectable locations like the
hypothalamus.
Hemispheric Pilocytic
Astrocytoma
When the JPA presents in the cerebral hemispheres, especially in
older children and young adults, the diagnosis may not be obvious. This
particular example has the classic "cyst with nodule" morphology. However, there
is marked variability in shape, and in this location, there can be significant
surrounding vasogenic edema. That may suggest an aggressive glioma, like a
GBM.
Cerebellar
JPA
Angiographically, the JPA is often an avascular or hypovascular
mass.
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