Primitive neuroectodermal tumor

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Primitive neuroectodermal tumor

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Overview

Primitive Neuroectodermal Tumors, or PNET, refers to two different tumor types. These include Peripheral PNET and CNS PNET. This can be a source of confusion.

Some PNET Types

Peripheral PNET

The Peripheral PNET is now thought to be virually identical to Ewing sarcoma:

"Current evidence indicates that both Ewing's sarcoma and PNET have a similar neural phenotype and, because they share an identical chromosome translocation, they should be viewed as the same tumor, differing only in their degree of neural differentiation. Tumors that demonstrate neural differentiation by light microscopy, immunohistochemistry, or electron microscopy have been traditionally labeled PNETs, and those that are undifferentiated by these analyses have been diagnosed as Ewing's sarcoma." [1]

PNET of the CNS

PNET of the CNS are grossly divided into supratentorial PNET and infratentorial PNET, the latter being more common. [1]

An example of infratentorial PNET includes Medulloblastomas, which occurs in the cerebellum.

An example of supratentorial PNET includes Pinealoblastomas, which occurs in the pineal region.

References


Acknowledgements

The content on this page was first contributed by: C. Michael Gibson, M.S., M.D.

Initial content for this page in some instances came from Wikipedia




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Acknowledgement and Attribution Regarding Sources of Content

Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .

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