Neuroectodermal neoplasm
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A neuroectodermal neoplasm is a neoplasm or tumor of the neuroectoderm.[http://www.cancer.gov/dictionary?CdrID=45952 Neuroectodermal tumor] entry in the public domain NCI Dictionary of Cancer Terms They are most commonly tumors in the central or peripheral nervous system.{{cn|date=June 2022}}
Tumors exhibiting neuroectodermal differentiation are classified into two main groups:{{cite journal|last1=Mills|first1=Stacey E|title=Neuroectodermal Neoplasms of the Head and Neck with Emphasis on Neuroendocrine Carcinomas|journal=Modern Pathology|volume=15|issue=3|year=2002|pages=264–278|issn=0893-3952|doi=10.1038/modpathol.3880522|pmid=11904342|doi-access=free}}
- Group I tumors/neoplasms: neuroendocrine carcinomas. These show predominantly epithelial differentiation. They include pituitary adenoma and carcinoid tumor
- Group II tumors/neoplasms: nonepithelial neuroectodermal neoplasms. These are predominantly neural in origin. They include malignant melanoma, olfactory neuroblastoma and Ewing's sarcoma.