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Rim enhancement of meningiomas on fast FLAIR imaging

K K Oguz1, A Cila

  • 1Radiology Department, School of Medicine, Hacettepe University, Sihhiye, 06100 Ankara, Turkey. karlioguz@yahoo.com

Neuroradiology
|February 20, 2003
PubMed

Insights

Peripheral enhancement on fast fluid-attenuated inversion-recovery (FLAIR) MRI is common in larger meningiomas. This imaging pattern may aid in distinguishing meningiomas from other extra-axial brain masses.

Area of Science:

  • Neuroradiology
  • Neuro-oncology
  • Medical Imaging

Background:

  • Meningiomas are common primary tumors of the central nervous system.
  • Accurate preoperative differentiation of meningiomas from other extra-axial masses is crucial.
  • Enhancement patterns on Magnetic Resonance Imaging (MRI) can provide diagnostic clues.

Purpose of the Study:

  • To investigate the enhancement patterns of meningiomas using fast fluid-attenuated inversion-recovery (FLAIR) MRI.
  • To correlate these patterns with tumor size, histology, and associated edema.
  • To assess the utility of fast FLAIR enhancement patterns in differentiating meningiomas.

Main Methods:

  • Retrospective analysis of 30 meningiomas using T2-weighted fast spin-echo (SE), T1-weighted SE with magnetisation-transfer saturation, and fast FLAIR sequences.
  • Imaging performed before and after contrast administration at 0.5 tesla.
  • Correlation of imaging findings with tumor size, histology (where available), and presence of edema.

Main Results:

  • 21 out of 30 meningiomas (70%) exhibited peripheral (rim) enhancement on fast FLAIR.
  • Larger meningiomas (>2 cm) were significantly more likely to show capsular enhancement (95%) compared to smaller ones (P<0.01).
  • Peripheral enhancement was observed across all meningioma types histologically examined.

Conclusions:

  • Peripheral enhancement on fast FLAIR MRI is a characteristic finding in a majority of meningiomas, particularly larger ones.
  • This enhancement pattern may serve as a valuable imaging biomarker for differentiating meningiomas from other extra-axial lesions.
  • Fast FLAIR imaging offers a useful tool for characterizing meningiomas and aiding in their diagnosis.

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