Table 1. Indications.

	Treatment	Indications	Reference
Patients unfit for surgery	Primary	Elderly patients with preexisting conditions Patients unfit to receive general anesthesia	2 9 12 13 15 16 17 18
Small or residual meningioma	Primary Secondary	Small, neurologically asymptomatic (average diameter < 3 cm) Small, neurologically symptomatic (average diameter < 3 cm) Large (average diameter > 3 cm) Involvement of critical structures	3 9 11 13 17 18 19 20 21 22 23 24 25
Cavernous sinus meningioma	Primary	Holocavernous Cranial nerves, intracranial artery, or pituitary involvement	4 9 11 15 20
Recurrent meningioma	Primary	Recurrence or residual following aggressive resection	2 8 13 16 21