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Primary primitive neuroectodermal tumor of the cauda equina.

P A Isotalo¹, C Agbi, B Davidson

¹Department of Laboratory Medicine, Ottawa Hospital, and University of Ottawa, Ontario, Canada.

Human Pathology

|September 15, 2000

Summary

Primitive neuroectodermal tumors (PNETs) are aggressive brain and spinal cord neoplasms. This report details a rare primary PNET of the cauda equina, highlighting its unique characteristics and implications for nervous system tumor classification.

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Area of Science:

Neuro-oncology
Pathology
Neurosurgery

Background:

Primitive neuroectodermal tumors (PNETs) are aggressive neoplasms of the central and peripheral nervous systems, characterized by undifferentiated cells with neural differentiation.
Accurate classification of PNETs is crucial, distinguishing them from other round-cell tumors like Ewing's sarcoma, lymphoma, rhabdomyosarcoma, and small cell carcinoma.
Intraspinal PNETs are rare and often metastatic, necessitating careful evaluation of their origin.

Observation:

This study reports the eighth case of a primary PNET originating in the cauda equina in a 52-year-old male with no prior medical history.
Histopathological examination revealed Homer-Wright rosettes.
Immunoreactivity for CD99, glial fibrillary acidic protein, neuron-specific enolase, S100, and synaptophysin confirmed the diagnosis.

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Findings:

The anatomical location of primary intrathecal PNETs is critical for determining their origin: spinal cord PNETs arise in the central nervous system, while cauda equina PNETs originate in the peripheral nervous system.
The histogenesis of intrathecal PNETs is potentially multifactorial.

Implications:

This case contributes to the understanding of rare peripheral nervous system PNETs.
Distinguishing between central and peripheral nervous system origins for spinal PNETs has significant diagnostic and potentially therapeutic implications.
Further research into the multifactorial histogenesis of intrathecal PNETs is warranted.