| 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. |