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Initial radiographic tumor control is similar following single or multi-fractionated stereotactic radiosurgery for jugular paragangliomas.

OBJECTIVE: To evaluate radiographic tumor control and treatment-related toxicity in glomus jugulare tumors treated with stereotactic radiosurgery (SRS).

STUDY DESIGN: Retrospective chart review.

SETTING: Tertiary academic referral center.

PATIENTS: Glomus jugulare tumors treated with SRS between 1998 and 2014 were identified. The data analysis only included patients with at least 18months of post-treatment follow up (FU).

INTERVENTION: Patients were treated with either single fraction or fractionated SRS.

MAIN OUTCOME MEASURE: Patient demographics and tumor characteristics were assessed. Radiographic control was determined by comparing pre and post treatment MRI, and was categorized as no change, regression, or progression.

RESULTS: Eighteen patients were treated with SRS, and 14 met inclusion criteria. Median age at treatment was 55years (range 35-79), and 71.4% of patients were female. 5 patients (35.7%) received single fraction SRS (dose range 15-18Gy), and 9 (64.3%) fractionated therapy (dose 3-7Gy×3-15 fractions). Median tumor volume was 3.78cm(3) (range 1.15-30.6). Median FU was 28.8months (range 18.6-56.1), with a mean of 31.7months. At their last recorded MRI, 7 patients (50%) had tumor stability, 6 (42.9%) had improvement, and 1 (7.1%) had progression. Disease improvement and progression rates in the single fraction group were 40% and 0%, and in the multiple-fraction group, 44.4% and 11.1%, respectively. There was no statistically significant difference in disease improvement (p=0.88) or progression (p=0.48) rates between groups (unpaired t-test).

CONCLUSIONS: At a median follow up of 28months, both single fraction and fractionated SRS appear to have comparable radiographic tumor control outcomes and toxicity profiles.

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