Grading system

Location of Tumor

Operative approach.

Type A

purely Intradural

Retromastoid Approach or ELITE

Type B

Intradural and involve the jugular bulb

Intradural and Transjugular approach

Type C

Intradural component and involve both the jugular bulb and the IJV

Intradural and Transjugular approach with possible ligation of the IJV.