Lateral ventricular meningiomas are rare, with an incidence of approximately 0.5-3% out of all intracranial meningiomas 1) 2).

1)
Nakamura M, Roser F, Bundschuh O. et al. Intraventricular meningiomas: a review of 16 cases with reference to the literature. Surg Neurol. 2003;59:491–503.
2)
Kim EY, Kim ST, Kim HJ. et al. Intraventricular meningiomas: radiological findings and clinical features in 12 patients. Clin Imaging. 2009;33:175–80.