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Pilocytic Astrocytoma
Definition 1
A WHO grade I, 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. (NCI Thesaurus/WHO)
Definition 2
A benign neoplasm of the brain or spinal cord arising from astrocytes associated with single or multiple cysts. (NCI Thesaurus/CDISC)
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