label: Pilocytic Astrocytoma
label_lc: pilocytic astrocytoma
description: "A WHO grade 1, relatively circumscribed, slowly growing, often cystic astrocytoma occurring in children and young adults.  Histologically it is characterized by a biphasic pattern with compacted bipolar cells associated with Rosenthal fibers and multipolar cells associated with microcysts and eosinophilic bodies/hyaline droplets. (WHO)"