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Repeated treatment of vestibular schwannomas after gamma knife radiosurgery

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Abstract

Purpose

When gamma knife radiosurgery (GKS) does not achieve control of the growth of a tumour, the need to repeat treatment is considered. The results and risks of repeat treatment of patients with a vestibular schwannoma were reviewed to assess its efficacy and safety.

Methods

Between 1992 and 2001, we treated 351 patients with a vestibular schwannoma by GKS, control of the growth of the tumour was not achieved in 32. 26 patients underwntrepeat GKS and five patients had an open microsurgical operation and one stereotactic aspiration of a tumour cyst.

Results

Twenty-four of 26 patients were followed up after the repeat GKS for a median of 43 months. 15 tumours became smaller, seven remained unchanged and two enlarged. After the second GKS one patient’s hearing deteriorated, one developed facial weakness and three facial spasms. One patient required insertion of ventriculo-peritoneal drainage. An operation to radically resect the tumour was performed in five patients after the first GKS and for a subtotal removal in one after repeated GKS.

Conclusions

In the small proportion of patients (9%) in whom initial GKS does not control the growth of a vestibular schwannoma, most can be controlled by further GKS with a very low risk of a complications.

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Correspondence to Roman Liscak.

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Comment

These experienced authors report their results after repeat radiosurgery for acoustic neuromas. After initial management, 9% of tumors underwent an additional radiosurgery or resection. This percentage is higher than in most other series and may reflect their unwillingness to follow tumors that have only transiently expanded but are not really growing. Most groups report a 2–3% rate for additional surgery. It may also reflect an initial willingness to use radiosurgery for larger tumors. After a second radiosurgery, they still had an 8% failure rate. As they note, a second gamma knife radiosurgery can be safe and effective for the majority of patients who have some tumor enlargement following initial care.

Douglas Kondziolka

Pittsburgh, Pennsylvania

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Liscak, R., Vladyka, V., Urgosik, D. et al. Repeated treatment of vestibular schwannomas after gamma knife radiosurgery. Acta Neurochir 151, 317–324 (2009). https://doi.org/10.1007/s00701-009-0254-0

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  • DOI: https://doi.org/10.1007/s00701-009-0254-0

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