Position and size of 83 petrosal veins in 25 patients without intraoperative validation and in 8 patients with intraoperative validation
| Type of SPV | No. of SPVs in Patients | Mean Diameter (Range) (mm) in Patients | ||
|---|---|---|---|---|
| Without Surgery | With Surgery | Without Surgery | With Surgery | |
| I, lateral | 13 (15.7%) | 1 (4.8%) | 2.0 (0.5–2.9) | 2.5 (2.5–2.5) |
| II, intermediate | 41 (49.4%) | 10 (47.6%) | 2.4 (<0.5–5.6) | 2.1 (1.5–3.6) |
| III, medial | 29 (34.9%) | 10 (47.6%) | 1.3 (<0.5–2.7) | 1.0 (<0.5–2.1) |
| I–III | 83 | 21 | 2.0 (<0.5–5.6) | 1.6 (<0.5–3.6) |