Incidental neoplasia
A systematic review of 16 studies in 19 559 patients reported the prevalence of incidental neoplastic brain findings in MRI studies as 0.7% with the prevalence of glioma at 0.05% 1).
1)
Morris Z, Whiteley WN, Longstreth WT, Weber F, Lee Y-C, Tsushima Y, et al. Incidental findings on brain magnetic resonance imaging: systematic review and meta-analysis. BMJ. 2009;339:b3016.