“…2,16 The pathognomonic finding of this tumor is its invasive nature, characterized pathologically by invasive meningiovascular proliferation, perivascular cuffs of spindle cell proliferation, perivascular connective tissue proliferation, and neurofibrillary tangles, often interspersed with more discrete meningiomas (3,4,9,10,12,16–21,24,26). …”