Neuroectodermal neoplasm

A neuroectodermal neoplasm is a neoplasm or tumor of the neuroectoderm.^[1] They are most commonly tumors in the central or peripheral nervous system.^{[citation needed]}

Neuroectodermal tumor
Specialty	Oncology

Tumors exhibiting neuroectodermal differentiation are classified into two main groups:^[2]

• 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.