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A neuroectodermal neoplasm is a neoplasm or tumor of the neuroectoderm. They are most commonly tumors in the central or peripheral nervous system.

Tumors exhibiting neuroectodermal differentiation are classified into two main groups:

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. ...