Comparison of typical PMA and pilocytic astrocytoma clinical and imaging features
| PMA | Pilocytic Astrocytoma | |
|---|---|---|
| Age | Younger (mean age, 1.5 yr) | Older (mean age, 4.8 yr) |
| Location | Hypothalamic/chiasmatic region | Cerebellum = hypothalamic/chiasmatic region |
| Enhancement | Homogeneous | Heterogeneous |
| Intratumoral contents | Most solid, with minimal tumoral cysts | Most have cystic content |
| Intratumoral hemorrhage | 12%–25% | 1%–8% |
| Evidence of leptomeningeal seeding | More frequent (up to 20%) | Exceedingly rare |