Over the past 15 years, non-malignant meningiomas have shown an increasing trend; however, malignant meningiomas have shown an opposite trend.
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Epidemiology and survival of non-malignant and malignant meningiomas in middle-aged females, 2004-2018.
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The sentences
Therefore, in the past 15 years, the IRs of non-malignant meningiomas have shown an increasing trend, whereas those of malignant meningiomas have shown a decreasing trend. 3.2.2.