Congress of Neurological Surgeons Systematic Review and Evidence-Based Guidelines Update for the Role of Imaging in the Management of Patients With Vestibular Schwannomas

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BACKGROUND: Imaging is a critical aspect of vestibular schwannoma (VS) management, influencing essentially every aspect of care including diagnosis, surveillance, treatment decision making, and follow-up after either resection or stereotactic radiosurgery. Despite this, treatment protocols are heterogeneous, and frequently based on historical practices, or low-quality evidence. OBJECTIVE: To update evidence-based guidelines for the use of imaging in the clinical management of patients with VS published by the Congress of Neurological Surgeons in 2018. METHODS: Systematic review of the literature published from 1/1/2015 to 5/20/2022 regarding imaging protocols for VS management. Salient questions were identified by a writing group of diverse individuals with topic-specific expertise. Questions were validated by the Congress of Neurological Surgeons Guidelines Committee. Following systematic review, literature tables and summary statements pertinent to the study questions were generated by the writing group, which underwent subsequent evaluation and revision by the task force before formalization. RESULTS: Seven questions were formulated; adequate literature was identified to formulate updated recommendations for 6 of these. Search strategy identified 1143 unique records, of which 109 underwent full-text review, and 57 were included in this study. Most studies provided level III evidence, with rare level II studies noted, yielding level III recommendations. CONCLUSION: The current evidence base for imaging protocols in VS clinical management is broad, diverse, low certainty, and low quality. This in part reflects a heterogeneous disease, although variability in treatment philosophies may also influence local decision making. Key areas for future study include the clinical utility of advanced imaging techniques and head-to-head comparisons of imaging protocols for patients in common initial VS management pathways (eg, observation, resection, or stereotactic radiosurgery). The full guideline can be seen online athttps://www.cns.org/guidelines/treatment-adults-vestibular-schwannoma/5-role-of-imaging-in-management-of-patients-with-v.

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