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| CNS Primitive neuroectodermal tumour ： ウィキペディア英語版 |
Primitive neuroectodermal tumor
Primitive neuroectodermal tumor (PNET) is a malignant (cancerous) neural crest tumor. It is a rare tumor, usually occurring in children and young adults under 25 years of age. The overall 5 year survival rate is about 53%.
It gets its name because the majority of the cells in the tumor are derived from neuroectoderm, but have not developed and differentiated in the way a normal neuron would, and so the cells appear "primitive".
PNET belongs to the Ewing family of tumors.
==Classification==
It is classified into two types, based on location in the body: peripheral PNET and CNS PNET.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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