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Comparison of typical PMA and pilocytic astrocytoma clinical and imaging features
PMAPilocytic Astrocytoma
AgeYounger (mean age, 1.5 yr)Older (mean age, 4.8 yr)
LocationHypothalamic/chiasmatic regionCerebellum > hypothalamic/chiasmatic region
EnhancementHomogeneousHeterogeneous
Intratumoral contentsMost solid, with minimal tumoral cystsMost have cystic content
Intratumoral hemorrhage12%–25%1%–8%
Evidence of leptomeningeal seedingMore frequent (up to 20%)Exceedingly rare