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PET and MRI Guided Irradiation of a Glioblastoma Rat Model Using a Micro-irradiator

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Radiation therapy alone for imaging-defined meningiomas.

Mariam P Korah¹, Adam W Nowlan, Peter A S Johnstone

¹Department of Radiation Oncology, Emory University School of Medicine, Atlanta, GA, USA. mariam@radonc.emory.org

International Journal of Radiation Oncology, Biology, Physics

|May 2, 2009

Summary

Single-modality radiation therapy (RT) provides excellent local control for imaging-defined meningiomas, comparable to surgery. This treatment offers a viable, low-morbidity alternative for select patients.

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Area of Science:

Neurosurgery
Radiation Oncology
Oncology

Background:

Meningiomas are primary tumors of the meninges.
Imaging-defined meningiomas lack histologic confirmation.
Treatment decisions often involve surgery or radiation therapy.

Purpose of the Study:

To evaluate the efficacy and toxicity of single-modality radiation therapy (RT) for imaging-defined meningiomas.
To compare RT outcomes with surgical resection benchmarks.

Main Methods:

Retrospective review of 41 patients with 42 imaging-defined meningiomas treated with RT alone (1985-2003).
Treatment modalities included stereotactic radiosurgery (SRS), fractionated stereotactic radiotherapy (FSR), and three-dimensional conformal therapy (3DCRT).
Median follow-up was 60 months; analysis used Kaplan-Meier methods.

Main Results:

High local control rate: 39 of 42 meningiomas (94% at 8 years).
Low toxicity: 1 patient experienced temporary neurologic sequela; no fatal complications.
Excellent 8-year actuarial freedom from complication survival rate of 97%.

Conclusions:

Single-modality RT is an effective treatment for imaging-defined meningiomas without significant mass effect.
RT offers local control comparable to surgery with significantly reduced morbidity.
Radiation therapy is a recommended alternative to surgery for various meningioma locations.