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Growth of Primary and Remnant Vestibular Schwannomas: A Three-Year Follow-Up Study.

Abstract：

OBJECTIVE:Vestibular schwannomas (VSs) are benign, slowly growing tumors. The management strategy, however, remains unclear for both primary VS and remnant VS after subtotal or partial resection. In this study, we analyzed the radiographical tumor growth to elucidate factors possibly predicting growth or regrowth of their tumors. METHODS:We retrospectively analyzed the data of 76 patients with diagnoses of VS at a single tertiary academic referral center. The primary VS group consisted of 43 patients with conservative management, and the remnant VS group included 33 patients with tumor remnant after surgery. All patients were followed up with serial magnetic resonance imaging without intervention. The primary end point in this study was significant tumor growth at the end of the 3-year follow-up period. RESULTS:Multivariate analysis revealed that remnant VS was less likely to grow than primary VS (odds ratio: 0.27, 95% confidence interval: 0.09-0.84). Tumor volume was correlated with tumor growth; larger tumors grew more frequently than small tumors in both primary and remnant VS groups with marginal (P = 0.05) and definite (P = 0.007) significance, respectively. The receiver operating characteristic curves plotted for tumor growth identified the optimum cutoff points of tumor volumes with greater sensitivity and specificity for remnant VS than for primary VS (sensitivity: 80% vs. 59%, specificity: 87% vs. 76%, respectively). CONCLUSIONS:Small remnant VS after surgery could be conservatively managed without additional treatment, and relatively large remnant VS should be followed up with close serial imaging or might be a possible candidate for radiosurgery during the early postoperative period.

journal_name

World Neurosurg

journal_title

World neurosurgery

authors

Tomita Y,Tosaka M,Aihara M,Horiguchi K,Yoshimoto Y

doi

10.1016/j.wneu.2015.02.005

subject

Has Abstract

pub_date

2015-06-01 00:00:00

pages

937-44

issue

6

eissn

1878-8750

issn

1878-8769

pii

S1878-8750(15)00082-0

journal_volume

83

pub_type

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