TABLE.

Classification of SRS Indications

Category	Definition	Clinical condition
Elective	May be delayed indefinitely with minimal risk of adverse consequences or treats conditions that can be managed medically	• Arteriovenous malformation • Trigeminal neuralgia • Functional indications (ie, thalamotomy)
Semielective	Should be performed within 3 to 6 mo to avoid adverse consequences	• Glomus tumor • Meningioma • Pituitary adenoma • Schwannoma
Semiurgent	Should be performed as soon as possible, but may be delayed over 48 h	• Brain metastases • Primary intracranial malignancy • Rapidly enlarging lesions • Compression of critical structures (ie, brainstem, opticapparatus, etc)
Urgent/emergent	Requires acute or subacute surgical intervention in less than 24 to 48 h	• N/A