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A Unified Methodological Framework for Vestibular Schwannoma Research
Published on: June 20, 2017
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Imaging Post Stereotactic Radiosurgery for Vestibular Schwannomas-When Should We Scan?
Trung Ton1, Anna Sheldon, Theofano Tikka
1Department of Otolaryngology, Skull Base Unit, Queen Elizabeth University Hospital, Glasgow, United Kingdom.
Summary
For vestibular schwannoma (VS) patients treated with stereotactic radiosurgery (SRS), imaging before 1 year post-treatment offers little clinical value. Tumor growth rate, not size, is a better indicator of SRS treatment response.
Area of Science:
- Neurosurgery
- Radiation Oncology
- Radiology
Background:
- Vestibular schwannomas (VS) are tumors affecting the auditory and balance nerves.
- Stereotactic radiosurgery (SRS) is a common treatment for VS.
- Optimal surveillance imaging protocols post-SRS for VS are not well-defined.
Purpose of the Study:
- To determine the ideal timing for magnetic resonance imaging (MRI) surveillance after SRS in patients with VS.
- To evaluate tumor size changes and growth rates in relation to imaging intervals.
Main Methods:
- Retrospective case series analysis of 42 VS patients treated with SRS.
- Inclusion criteria required at least two pre- and two post-SRS MRI scans.
- Analysis of tumor demographics, size, and monthly growth ratio pre- and post-SRS.
Main Results:
- No significant change in average tumor size was observed 2 years post-SRS (p=0.5).
- Initial MRIs (average 11 months post-SRS) showed a slight average size increase (+0.53 mm).
- The growth per month ratio significantly decreased post-SRS (p<0.001), indicating treatment effectiveness.
Conclusions:
- Post-SRS MRI surveillance before 1 year is generally not clinically beneficial for VS unless specific indications exist.
- The monthly tumor growth ratio is a more sensitive metric for assessing SRS treatment response than absolute tumor size.
