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Related Experiment Videos

MRI changes in embolized meningiomas.

T Terada1, Y Nakamura, M Tsuura

  • 1Department of Neurological Surgery, Wakayama Medical College, Japan.

Neuroradiology
|January 1, 1992
PubMed
Summary
This summary is machine-generated.

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Superselective embolization of hypervascular meningiomas using Gelfoam or polyvinyl alcohol (PVA) particles alters MRI signals. Post-embolization, MRI shows signal void loss, reduced enhancement, and prolonged T1 and T2 relaxation times.

Area of Science:

  • Neuroradiology
  • Interventional Radiology
  • Medical Imaging

Background:

  • Hypervascular meningiomas are tumors requiring effective treatment strategies.
  • Superselective embolization is a minimally invasive technique used to treat these tumors.
  • Understanding post-embolization changes on Magnetic Resonance Imaging (MRI) is crucial for patient management.

Observation:

  • MRI was performed after superselective embolization of hypervascular meningiomas.
  • Two embolic agents were used: Gelfoam powder and polyvinyl alcohol (PVA) particles (150-250 microns).
  • Changes in MRI signal void, gadolinium-DTPA contrast enhancement, and T1 and T2 relaxation times were assessed.

Findings:

  • Embolization led to loss of signal void and decreased gadolinium-DTPA enhancement.

Related Experiment Videos

  • Prolonged T1 and T2 relaxation times were observed in most cases.
  • Shortened T1 and T2 were noted in two Gelfoam-treated cases, attributed to iodinated contrast pooling.
  • In vitro studies confirmed iodinated contrast medium causes T1 and T2 shortening.

    • Implications:

    • MRI findings after embolization help differentiate treatment effects from tumor progression.
    • The study clarifies the impact of embolic agents and contrast media on MRI signal characteristics.
    • Accurate interpretation of post-embolization MRI is vital for clinical decision-making in meningioma management.