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Comparing size evaluation methods for acoustic neuroma after stereotactic radiosurgery

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Abstract

Purpose

Acoustic neuroma tumor size may be evaluated using several methods. Here we investigate the variations among measuring techniques.

Materials and methods

A retrospective analysis of pre- and posttreatment magnetic resonance (MR) scans was performed on 15 acoustic neuroma patients with a history of stereotactic radiosurgery who had been followed for more than 2 years. Tumor size was measured on each MR scan using three methods, where the extracanalicular (EX) and intracanalicular (IN) portions were measured separately. We collected data on the largest diameter (M1), the square root of the product of the maximum anteroposterior and mediolateral diameter (M2), and the average for the maximum anteroposterior, mediolateral, and superoinferior diameters (M3). Size differences between follow-up MR scans separated by more than 2 years were calculated for each method, and we evaluated whether the tumors progressed, remained stable, or regressed.

Results

A total of 154 follow-up pairs of EX and 115 follow-up pairs of IN showed a statistically significant difference for the number of each category among the three methods (P = 0.03, P < 0.01, respectively). The greatest category agreement was observed between the M2 and M3 methods.

Conclusion

A significant difference between the tumor size measuring methods was observed. To strengthen specificity when evaluating tumor size difference, a measuring method using two or more parameters is recommended.

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Authors and Affiliations

  1. Department of Radiation Oncology, Health Science Center, University of Florida, PO Box 100385, Gainesville, FL, 32610-0385, USA

    Anneyuko I. Saito, Christopher G. Morris & William M. Mendenhall

  2. Department of Radiology, Juntendo University School of Medicine, Tokyo, Japan

    Anneyuko I. Saito, Kana Ito & Kumiko Karasawa

  3. Department of Radiology, School of Medicine, Juntendo University Shizuoka Hospital, Izunokuni, Japan

    Futoshi Watanabe

  4. Department of Radiology, Japan Self-Defense Forces Central Hospital, Tokyo, Japan

    Yutaka Naoi

Authors
  1. Anneyuko I. Saito
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  2. Christopher G. Morris
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  3. Kana Ito
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  4. Futoshi Watanabe
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  5. Kumiko Karasawa
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  6. William M. Mendenhall
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  7. Yutaka Naoi
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Corresponding author

Correspondence to Anneyuko I. Saito.

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Saito, A., Morris, C., Ito, K. et al. Comparing size evaluation methods for acoustic neuroma after stereotactic radiosurgery. Radiat Med 25, 339–345 (2007). https://doi.org/10.1007/s11604-007-0150-6

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  • DOI: https://doi.org/10.1007/s11604-007-0150-6

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