Assessment of Tumor Volume Dynamics and Outcome After Radiosurgery for the Treatment of Vestibular Schwannoma: A Single-Center Experience.
Otol Neurotol
; 42(6): e750-e757, 2021 07 01.
Article
in En
| MEDLINE
| ID: mdl-34111052
ABSTRACT
OBJECTIVE:
To assess the factors affecting early local and audiometric outcomes in vestibular schwannoma (VS) patients treated with stereotactic radiosurgery (SRS). STUDYDESIGN:
A retrospective review of medical records.SETTING:
Tertiary referral center. PATIENTS Records of all adult patients who underwent SRS between 2010 and 2016 for the treatment of VS were retrospectively reviewed. Patients treated with microsurgery or multi-fractionation schemes, and those who had neurofibromatosis type 2, were excluded. INTERVENTION SRS, tumor volume/size measurements. MAIN OUTCOMEMEASURES:
The impact of tumor volume dynamics on the early local and hearing-related outcomes, together with the factors that influence them following SRS, and comparison of different tumor size measurement methods.RESULTS:
From 2010 to 2016, 53 patients underwent single fraction SRS of 12âGy. Median follow-up time was 32 months (range, 6-79). At the last follow-up, only one patient had clinical progression. Age less than or equal to 65 years (pâ=â0.04; odds ratio [OR] 0.17; 95% confidence interval [CI] 0.03-0.93) and baseline pure-tone average (PTA) level less than or equal to 30âdB (pâ=â0.03; OR 0.90; 95% CI 0.84-0.96) were associated with maintenance of serviceable hearing. On multivariate analysis, PTA remained significant (pâ=â0.01; OR 0.04; 95% CI 0.003-0.45). In patients with a loss of serviceable hearing, the mean volume increase tended to be higher than in the patients whose hearing was maintained. The linear measurement method underestimated, and the Aâ×âBâ×âC/2 equation overestimated, the radiological progression compared with 3D-volumetric delineations.CONCLUSION:
During the median observation period of almost 3 years, we reported our early outcome results. Tumor volume increase may have an impact on serviceable hearing loss after SRS. Currently there is no widely accepted method for the evaluation of post-SRS response. Linear measurement and the Aâ×âBâ×âC/2 equation produce less reliable estimates of radiological progression compared with 3D-volumetric delineations. Accurate volume measurements with 3D delineations should be considered as part of clinical routine for assessing progression and deciding on salvage therapies.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Neuroma, Acoustic
/
Radiosurgery
Type of study:
Observational_studies
/
Prognostic_studies
/
Risk_factors_studies
Limits:
Adult
/
Humans
Language:
En
Journal:
Otol Neurotol
Journal subject:
NEUROLOGIA
/
OTORRINOLARINGOLOGIA
Year:
2021
Document type:
Article