Table 2.

Distinguishing features of subtypes of meningioma

Pathological subtype	Distinguishing imaging features
Meningothelial	Classical meningioma pattern
Fibrous	T2W hypointensity
Transitional	T2W heterogeneous appearance
Psammomatous	Dense calcification
Angiomatous	Large, prominent intratumoural and peritumoral feeding vessels
Microcystic	T1W hypointensity
Secretory	Skull base location, T2W hyperintensity
Lymphoplasmacyte-rich	En-plaque pattern
Metaplastic	Mesenchymal components on background of meningioma
Chordoid	High mean ADC values
Clear cell	Cerebellopontine angle location, osteolysis
Atypical and WHO grade III	Ill-defined margins, diffusion restriction, high Ktrans