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Supratentorial ectopic ependymoma

O Vernet1, J P Farmer, K Meagher-Villemure

  • 1Department of Neurosurgery, Montreal Children's Hospital, McGill University, Quebec, Canada.

The Canadian Journal of Neurological Sciences. Le Journal Canadien Des Sciences Neurologiques
|November 1, 1995
PubMed
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This study presents a rare case of an ectopic ependymoma in an 11-year-old female, found far from the brain's ventricles. This finding challenges typical ependymoma locations and prompts discussion on its origins.

Area of Science:

  • Neuro-oncology
  • Pediatric Neurosurgery
  • Pathology

Background:

  • Ependymomas are tumors typically originating from the ependymal cells lining the brain's ventricular system.
  • Typical locations include the posterior fossa and supratentorial ventricles.

Observation:

  • An 11-year-old female presented with symptoms including headache, nausea, vomiting, papilledema, and neurological deficits.
  • Imaging revealed a 3 cm left precentral subcortical lesion, notably distant from the ventricular surface.
  • Surgical resection confirmed a supratentorial ectopic ependymoma.

Findings:

  • Histopathological, immunohistochemical, and electron microscopic analyses confirmed the diagnosis of ependymoma.
  • The tumor was located in the centrum semiovale white matter, approximately 3 cm from the ventricle.

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  • Post-operative imaging and staging investigations ruled out tumor dissemination.

    • Implications:

    • This case highlights the possibility of ependymomas occurring in extranventricular locations, challenging conventional understanding.
    • Further research into the pathogenesis of ectopic ependymomas is warranted.
    • Such rare presentations necessitate a broad differential diagnosis in pediatric neuro-oncology.