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Comparing size evaluation methods for acoustic neuroma after stereotactic radiosurgery
Anneyuko I Saito1, Christopher G Morris, Kana Ito
1Department of Radiation Oncology, Health Science Center, University of Florida, PO Box 100385, Gainesville, FL 32610-0385, USA. anyusaike@yahoo.co.jp
Radiation Medicine
|August 21, 2007
Summary
Different methods for measuring acoustic neuroma tumor size show significant variations. Using multiple measurement parameters, such as M2 and M3, improves the specificity of tumor size evaluation.
Area of Science:
- Neurosurgery
- Radiology
- Oncology
Background:
- Acoustic neuromas require accurate size evaluation for treatment monitoring.
- Standardized methods for measuring tumor size are crucial for assessing treatment efficacy.
- Magnetic resonance (MR) imaging is a primary tool for acoustic neuroma assessment.
Purpose of the Study:
- To investigate variations among different techniques for measuring acoustic neuroma tumor size.
- To compare the reliability of three distinct measurement methods (M1, M2, M3).
Main Methods:
- Retrospective analysis of MR scans from 15 acoustic neuroma patients treated with stereotactic radiosurgery.
- Tumor size measured using three methods: largest diameter (M1), geometric mean (M2), and average of three diameters (M3).
- Extracanalicular (EX) and intracanalicular (IN) portions analyzed separately over 2+ years follow-up.
Main Results:
- Statistically significant differences were found in tumor size measurements among the three methods for both EX and IN portions.
- The M2 and M3 measurement methods demonstrated the highest agreement.
- Tumor progression, stability, or regression varied based on the measurement technique used.
Conclusions:
- Acoustic neuroma tumor size measurement methods yield significantly different results.
- Employing measurement techniques that incorporate multiple parameters (e.g., M2, M3) enhances specificity in evaluating tumor size changes.
- Standardized, multi-parameter measurement approaches are recommended for consistent acoustic neuroma assessment.
