| Gender differences | Men | Women | P values |
| Distance from IPS to BS at JT (mm) | 8.12±2.88 | 6.67±1.88 | 0.014 |
| Distance from IPS to BS at IAC (mm) | 4.87±1.76 | 3.89±1.92 | 0.028 |
| Distance from IPS to BS at CN VI (mm) | 4.29±1.77 | 3.43±1.49 | 0.029 |
| Length of IPS from JB to IAC (mm) | 20.05±2.80 | 18.7±2.64 | 0.038 |
Values are mean (±SD).
BA, basilar artery; BS, brainstem; CN, cranial nerve; IAC, internal auditory canal; IPS, inferior petrosal sinus; JB, jugular bulb; JT, jugular tubercle.