Anterior skull base Meningiomas

Olfactory Groove Meningiomas (OGM)
Nomenclature of anterior skull base meningiomas
Planum Sphenoidale Meningiomas
Tuberculum Sellae Meningioma (TSM)

Comparison of OGM and TSM

Factor	OGM	TSM
Location	Cribriform, frontosphenoid suture	Planum sphenoidale, tuberculum sellae
Blood supply	Ant & pos ethmoidals, middle meningeal, ophthalmic (meningeal branch, ACA & ACoA)	Pos ethmoidal (ACA & ACoA)
Olfactory nerves	Superolat	Inferolat
Optic nerve/chiasm	Inferolat	Superolat
ACA	Pos. to posterosuperior	Posterosuperior