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[Hypodense meningioma. A care report]

A García-Pravos1, M Gelabert, M D Arias

  • 1Servicio de Neurocirugía, Complejo Hospitalario Universitario de Santiago, Santiago de Compostela, España.

Revista De Neurologia
|April 9, 1998
PubMed
Summary

Hypodense meningiomas, tumors with fatty degeneration, present unique diagnostic challenges. This case highlights the differential diagnosis for these rare, fat-containing brain tumors identified via imaging.

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Area of Science:

  • Neuro-oncology
  • Radiology
  • Pathology

Background:

  • Meningiomas, typically isodense or hyperdense on CT scans, originate from the arachnoid layer.
  • Hypodense meningiomas, rare variants, are often associated with significant fat content.
  • Fatty degeneration in meningiomas can lead to hypodense appearances on imaging.

Observation:

  • A 73-year-old woman presented with a meningioma exhibiting extensive fatty degeneration.
  • Computed axial tomography (CAT) revealed a hypodense lesion with well-defined borders and heterogeneous contrast enhancement.
  • Magnetic resonance imaging (RMN) demonstrated heterogeneous signal intensities.

Findings:

  • The observed tumor was a meningiotheliomatous meningioma with substantial fatty degeneration, appearing hypodense on CAT.

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  • Pure lipomeningiomas are exceedingly rare, with only four cases previously reported.
  • Fatty degeneration is a more frequent cause of hypodensity in meningiomas than pure lipomatous composition.

    • Implications:

    • Understanding imaging characteristics is crucial for the differential diagnosis of hypodense meningiomas.
    • Distinguishing between fatty degeneration and pure lipoma is important for accurate diagnosis and management.
    • This case contributes to the literature on atypical meningioma presentations and their radiological features.