In the article “Lymphoplasmacyte-rich meningioma involving the whole intracranial dura mater,” Drs. Yang et al. reported a case of a 47-year-old woman with a lesion involving the intracranial dura mater and right trigone of the lateral ventricle, with dense lymphoplasmacytic infiltration on pathology, diagnosed as a rare type of meningioma. Drs. Fukuhara and Makifuchi present a similar case with dense lymphoplasmacytic infiltration that was diagnosed as immunoglobulin G4 (IgG4) pachymeningitis following positive IgG4 immunohistochemical staining.