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Related Experiment Videos

Peripheral-type primitive neuroectodermal tumor arising in the tentorium. Case report.

Y Katayama1, S Kimura, T Watanabe

  • 1Department of Neurological Surgery, Nihon University School of Medicine, Tokyo, Japan.

Journal of Neurosurgery
|July 21, 1999
PubMed
Summary

A rare peripheral primitive neuroectodermal tumor (PNET) in a child

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Area of Science:

  • Neuro-oncology
  • Pediatric Neurosurgery
  • Molecular Pathology

Background:

  • Peripheral primitive neuroectodermal tumors (PNETs) are rare, aggressive neoplasms.
  • Intracranial PNETs are more common than peripheral PNETs.
  • PNETs present diagnostic challenges due to overlapping histological features.

Observation:

  • A 5-year-old boy presented with symptoms suggestive of increased intracranial pressure, including vomiting and left abducens nerve palsy.
  • A tumor was identified in the tentorium cerebelli.
  • Histopathological examination revealed small, round blue cells with Homer-Wright rosettes.

Findings:

  • Immunohistochemical analysis showed positivity for HBA-71, recognizing the MIC2 gene product (p30/32).
  • The tumor exhibited characteristics consistent with peripheral PNET, distinct from central/intracranial PNETs.

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  • Complete surgical excision via a transpetrosal approach was achieved.

    • Implications:

    • This case highlights the possibility of peripheral PNETs occurring in the CNS dura, specifically the tentorium.
    • Successful surgical management resulted in a 7-year disease-free survival.
    • Further research into the genetic distinctions between peripheral and central PNETs is warranted.