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Cystic meningioma simulating arachnoid cyst: report of an unusual case

Jorge Docampo, Docampo Jorge1, Nadia Gonzalez

  • 1Fundación Científica del Sur, Hipólito Yrigoyen 8680, Lomas de Zamora, B1832BQS Buenos Aires, Argentina.

Case Reports in Radiology
|July 25, 2014
PubMed

Insights

This case study highlights a rare cystic meningioma mimicking an arachnoid cyst on imaging. The tumor presented with a mural nodule showing enhancement and diffusion restriction on MRI.

Area of Science:

  • Neurology
  • Radiology
  • Oncology

Background:

  • Meningiomas are typically solid tumors arising from the meninges.
  • Cystic meningiomas are rare, and their imaging characteristics can sometimes mimic other cystic lesions.
  • Arachnoid cysts are benign congenital formations that can cause mass effect symptoms.

Purpose of the Study:

  • To present an unusual case of a predominantly cystic meningioma.
  • To illustrate the imaging features of this rare meningioma subtype on CT and MRI.
  • To differentiate this meningioma from an arachnoid cyst based on specific radiological findings.

Main Methods:

  • A 63-year-old female patient presented with headache and vision disorders.
  • Computed Tomography (CT) scan was performed for initial evaluation.
  • Magnetic Resonance Imaging (MRI) with and without gadolinium contrast was utilized for detailed characterization.

Main Results:

  • The meningioma appeared predominantly cystic and hypodense on CT scan.
  • On MRI, the cystic portion showed fluid signal intensity on T1- and T2-weighted images.
  • A small mural nodule within the cyst demonstrated gadolinium enhancement and diffusion restriction.

Conclusions:

  • Cystic meningiomas can present with imaging features that simulate arachnoid cysts.
  • The presence of an enhancing mural nodule with diffusion restriction is a key differentiating feature.
  • Advanced MRI techniques are crucial for accurate diagnosis of rare meningioma variants.

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