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01-09-2014 | Original article

Hypofractionated stereotactic radiotherapy of acoustic neuroma

Volume changes and hearing results after 89-month median follow-up

Authors: Manfred Kranzinger, MD, Franz Zehentmayr, Gerd Fastner, Gerhard Oberascher, Florian Merz, Olaf Nairz, Hassan Rahim, Felix Sedlmayer

Published in: Strahlentherapie und Onkologie | Issue 9/2014

Abstract

Purpose

The goal of this work was to evaluate toxicity and local control following hypofractionated stereotactic radiation treatment with special focus on changes in tumor volume and hearing capacity.

Patients and methods

In all, 29 patients with unilateral acoustic neuroma were treated between 2001 and 2007 within a prospective radiation protocol (7 × 4 Gy ICRU dose). Median tumor volume was 0.9 ml. Follow-up started at 6 months and was repeated annually with MRI volumetry and audiometry. Hearing preservation was defined as preservation of Class A/B hearing according to the guidelines of the American Academy of Otolaryngology (1995).

Results

No patient had any intervention after a median imaging follow-up of 89.5 months, one patient showed radiological progression. Transient increase of tumor volume developed in 17/29 patients, whereas 22/29 patients (75.9 %) presented with a volume reduction at last follow-up. A total of 21 patients were eligible for hearing evaluation. Mean pure tone average (PTA) deteriorated from 39.3 to 65.9 dB and mean speech discrimination score (SDS) dropped from 74.3 to 38.1 %. The 5-year actuarial Class A/B hearing preservation rate was 50.0 ± 14.4 %.

Conclusion

Radiation increases only minimally, if at all, the hearing deterioration which emerges by observation alone. Presbyacusis is not responsible for this deterioration. Transient tumor enlargement is common. Today radiation of small- and medium-sized acoustic neuroma can be performed with different highly conformal techniques as fractionated treatment or single low-dose radiosurgery with equal results regarding tumor control, hearing preservation, and side effects. Hypofractionation is more comfortable for the patient than conventional regimens and represents a serious alternative to frameless radiosurgery.

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Title: Hypofractionated stereotactic radiotherapy of acoustic neuroma
Volume changes and hearing results after 89-month median follow-up
Authors: Manfred Kranzinger, MD
Franz Zehentmayr
Gerd Fastner
Gerhard Oberascher
Florian Merz
Olaf Nairz
Hassan Rahim
Felix Sedlmayer
Publication date: 01-09-2014
Publisher: Springer Berlin Heidelberg
Published in: Strahlentherapie und Onkologie / Issue 9/2014
Print ISSN: 0179-7158
Electronic ISSN: 1439-099X
DOI: https://doi.org/10.1007/s00066-014-0630-4

Keynote webinar | Spotlight on sleep in brain health

Springer Medicine

Hypofractionated stereotactic radiotherapy of acoustic neuroma

Volume changes and hearing results after 89-month median follow-up

Abstract

Purpose

Patients and methods

Results

Conclusion

Keynote webinar | Spotlight on sleep in brain health

Springer Medicine

Abstract

Purpose

Patients and methods

Results

Conclusion

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