This online risk calculator could be used as a tool to guide management for patients with incidental asymptomatic meningiomas. 

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PLEASE READ THE DISCLAIMER BEFORE USING THE CALCULATOR OR THIS WEBSITE.

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By using the calculator or the website, you accept this disclaimer. If you do not accept this disclaimer, do not use the calculator or the website.​

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The IMPACT calculator is based on the following research: Islim AI, Millward CP, Zakaria R, Piper RJ, Fountain DM, Mehta S, Kolamunnage-Dona R, Ali U, Koszdin SD, Georgious T, Mathew RK, Mills SJ, Brodbelt AR, Santarius T, Jenkinson MD; IMPACT Study Investigators, International Consortium on Meningioma (ICOM) and British Neurosurgical Trainee Research Collaborative (BNTRC). A Clinical Tool to Identify Incidental Meningioma for Early Outpatient Management. JAMA Oncol. 2025 Nov 20:e254821. doi: 10.1001/jamaoncol.2025.4821 and Islim AI, Kolamunnage-Dona R, Mohan M, Moon RDC, Crofton A, Haylock BJ, Rathi N, Brodbelt AR, Mills SJ, Jenkinson MD. A prognostic model to personalize monitoring regimes for patients with incidental asymptomatic meningiomas. Neuro Oncol. 2020 Feb 20;22(2):278-289

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This calculator is distributed under the terms of the Creative Commons Attribution-Non-Commercial 3.0 International License (CC BY-NC 3.0) (http://creativecommons.org/licenses/by-nc/3.0/), which permits the user to copy and redistribute the material in any medium or format and to remix, transform, and build upon the material, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Data should only be used for non-commercial research purposes by research professionals.

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IMPACT provides individualised management strategies for incidentally-found asymptomatic meningioma based on radiological and clinical parameters. It has been externally validated. Implementation of the results in a clinical setting is in the sole responsibility of the user and/or treating physician.

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By using the calculator, you agree not to hold the authors, any of their affiliated institutions, or any of their respective directors, officers, employees, agents, suppliers or partners liable in any way for the use of the calculator or use of the data obtained by using the calculator. You agree to indemnify and hold the aforementioned parties harmless from and against any and all damages, losses, liabilities, costs and expenses incurred by any of them arising out of or related to your use of the calculator.

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The calculator and the information provided are not intended or implied to be a substitute for medical advice offered by a healthcare professional. If you require such services or advice regarding the calculator or the information and results generated by the calculator, you should consult a healthcare professional.

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