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Int J Radiat Oncol Biol Phys. 2007 Jul 1;68(3):858-63. Epub 2007 Mar 26.

Intensity-modulated radiotherapy for complex-shaped meningioma of the skull base: long-term experience of a single institution.

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1
Department of Clinical Radiology, Radiation Therapy, University of Heidelberg, Germany. Stefanie_Milker-Zabel@med.uni-heidelberg.de

Abstract

PURPOSE:

We analyzed our long-term experience with intensity-modulated radiotherapy (IMRT) in patients with complex-shaped meningioma of the skull base.

PATIENTS AND METHODS:

Between January 1998 and December 2004, 94 patients with complex-shaped meningioma were treated using IMRT at our institution. Tumor distribution was: World Health Organization (WHO) Grade 1 in 54.3%, WHO Grade 2 in 9.6%, and WHO Grade 3 in 4.2%. In 31.9% of patients, the clinical and radiologic characteristics of the tumor were consistent with the diagnosis of meningioma. Twenty-six patients received radiotherapy as primary treatment and 14 patients postoperative for residual disease. Fifty-four patients were treated after local recurrence. Median target volume was 81.4 mL, median total dose was 57.6 Gy given in 32 fractions.

RESULTS:

Median follow-up was 4.4 years. Overall local control was 93.6%. Sixty-nine patients had stable disease based on computed tomography/magnetic resonance imaging (MRI), whereas 19 had a tumor volume reduction after IMRT. Six patients showed local tumor progression on MRI 22.3 months' median after IMRT. Three patients died from non-treatment-related conditions after IMRT. In 39.8% of the patients, preexisting neurologic deficits improved. Worsening of preexisting neurologic symptoms was seen in 4 patients and 2 patients developed new clinical symptoms from local tumor progression. Transient side effects such as headache were seen in 7 patients. Treatment-induced loss of vision was seen in 1 of 53 reirradiated patients with a Grade 3 meningioma 9 months after retreatment with IMRT.

CONCLUSION:

These data demonstrate that IMRT is an effective and safe treatment modality for long-term local control of complex-shaped and otherwise difficult to treat meningioma.

PMID:
17379447
DOI:
10.1016/j.ijrobp.2006.12.073
[Indexed for MEDLINE]
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