Table 4.
Prevalence of each superior petrosal vein complex tributary and its relation to the surgical field
| Tributary veins | Prevalence (% from 50 cases) | Doubled tributaries (% from 50 cases) | Disturbing the operative field (% from 50 cases) | Compressing the TGN (% from 50 cases) |
|---|---|---|---|---|
| v.CPF | 43 (86%) | 0 | 34 (68%) | 3 (6%) |
| PTv | 40 (80%) | 7 (14%) | 33 (66%) | 2 (4%) |
| v.MCP | 25 (50%) | - | 13 (26%) | 2 (4%) |
| TPv | 25 (50%) | 1 (2%) | 6 (12%) | 7 (14%) |
| ALMv | 20 (40%) | 1 (2%) | 11 (22%) | - |
| Total | 153 tributaries | 9 veins in 8 cases | 14 veins in 13 cases1 |
ALMv anterior lateral marginal vein, PTv pontotrigeminal vein, SPVC superior petrosal vein complex, TPv transverse pontine vein, v.CPF vein of the cerebellopontine fissure, v.MCP vein of the middle cerebellar peduncle
1There were 14 cases with venous compression of the trigeminal nerve with a total of 16 offensive veins. One case had 1 of 2 main SPVs as the single culprit vein and was therefore not taken into consideration in this table. Another 2 cases had 2 offensive veins; 1 of 2 SPVs and a TPV in 1 case and a v.CPF and a TPv in the other case