Table 3.
The prevalence of the number of tributaries in an superior petrosal vein complex and its relation to the surgical field
| Number of tributaries in an SPVC | Prevalence | Presence of a vein compressing the TGN | Number of disturbing tributaries in an SPVC | Prevalence |
|---|---|---|---|---|
| 1 | 1 (2%) | 0 | 1 | 11 (22%) |
| 2 | 12 (24%) | 1* | 2 | 21 (42%) |
| 3 | 21 (42%) | 71 | 3 | 10 (20%) |
| 4 | 13 (26%) | 4 | 4 | 3 (6%) |
| 5 | 2 (4%) | 2* | 5 | 0 |
| 0 | 5 (10%) | |||
| Total | 50 cases | 14 of 50 cases | Total | 50 cases |
TGN trigeminal nerve, SPVC superior petrosal vein complex
*Each of these groups had 1 case with 2 offending veins that compressed the TGN. All other cases had only a single offending vein
1In 1 of these cases, only 1 SPV was the culprit vein without involvement of tributaries. This case had 2 main SPVs