primitive neuroectodermal tumors

Definition of primitive neuroectodermal tumor
National Cancer Institute

primitive neuroectodermal tumor

(PRIH-muh-tiv NOOR-oh-EK-toh-DER-mul TOO-mer)
One of a group of cancers that develop from the same type of early cells, and share certain biochemical and genetic features. Some primitive neuroectodermal tumors develop in the brain and central nervous system (CNS-PNET), and others develop in sites outside of the brain such as the limbs, pelvis, and chest wall (peripheral PNET). Also called PNET.

Source: NCI Dictionary of Cancer Terms