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"Rhabdoid meningioma" lacking malignant features. Report of two cases.

W A Cooper1, M Shingde, V K Lee

  • 1Department of Pathology, University of Sydney, Australia. wendy.cooper@email.cs.nsw.gov.au

Clinical Neuropathology
|February 28, 2004
PubMed
Summary

This study describes two rare meningiomas with rhabdoid features in adult women. These tumors showed meningothelial differentiation without malignant histological signs, presenting unique diagnostic considerations.

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Area of Science:

  • Neuropathology
  • Oncology

Background:

  • Meningiomas are tumors arising from the meninges.
  • Rhabdoid morphology in meningiomas is uncommon and its significance is debated.

Observation:

  • Two adult female patients presented with meningiomas exhibiting rhabdoid morphology.
  • Tumors originated from the tentorium and Sylvian fissure.
  • Histological and ultrastructural analyses revealed meningothelial differentiation with rhabdoid areas.

Findings:

  • Rhabdoid areas characterized by cells with eosinophilic cytoplasmic inclusions and eccentric nuclei.
  • One case showed sheet-like growth, macronucleoli, and brain invasion.
  • Unlike typical aggressive tumors, these rhabdoid meningiomas lacked significant mitotic activity or other atypical features.

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Implications:

  • These findings highlight the diagnostic challenges posed by meningiomas with rhabdoid morphology.
  • Understanding the benign nature of these specific rhabdoid meningiomas is crucial for accurate diagnosis and prognosis.
  • Further research is needed to clarify the diagnostic and prognostic significance of this tumor entity.