Table 5.
Anatomical variations of superior petrosal vein complexes
| Number of SPVs (number of patients) | General configuration1 (number of patients) | Individual variation | Number of patients | |
|---|---|---|---|---|
| 1 (32) | 1.1 (1) | 1.1.1 | SPV: TPv | 1 |
| 1.2 (10) | 1.2.1 | SPV: v.CPF + PTv | 5 | |
| 1.2.2 | SPV: v.CPF + TPv | 2 | ||
| 1.2.3 | SPV: v.CPF + v.MCP | 1 | ||
| 1.2.4 | SPV: v.CPF + v.ALM | 1 | ||
| 1.2.5 | SPV: PTv + v.MCP | 1 | ||
| 1.3 (12) | 1.3.1 | SPV 1: v.CPF + PTv + TPv | 2 | |
| 1.3.2 | SPV 1: v.CPF + PTv + v.MCP | 3 | ||
| 1.3.3 | SPV 1: v.CPF + PTv + ALMv | 1 | ||
| 1.3.4 | SPV 1: v.CPF + TPv + v.MCP | 2 | ||
| 1.3.5 | SPV 1: PTv + TPv + ALMv | 1 | ||
| 1.3.6 | SPV 1: PTv + v.MCP + ALMv | 3 | ||
| 1.4 (9) | 1.4.1 | SPV 1: v.CPF + PTv + TPv + v.MCP | 2 | |
| 1.4.2 | SPV 1: v.CPF + PTv + TPv + ALMv | 5 | ||
| 1.4.3 | SPV 1: v.CPF + PTv + v.MCP + ALMv | 2 | ||
| 2 (16) | 2.2 (2) | 2.2.1 |
SPV 1: v.CPF SPV 2: TPv |
1 |
| 2.2.1 |
SPV 1: v.CPF SPV 2: ALMv |
1 | ||
| 2.3 (9) | 2.3.12 |
SPV 1: PTv1 SPV 2: v.CPF + PTv2 |
1 | |
| 2.3.2 |
SPV 1: PTv SPV 2: v.CPF + v.MCP |
1 | ||
| 2.3.3 |
SPV 1: TPv SPV 2: v.CPF + PTv |
4 | ||
| 2.3.4 |
SPV 1: TPv SPV 2: v.CPF + ALMv |
1 | ||
| 2.3.5 |
SPV 1: v.MCP SPV 2: v.CPF + PTv |
2 | ||
| 2.4 (3) | 2.4.1 |
SPV 1: v.CPF SPV 2: PTv + v.MCP + ALMv |
1 | |
| 2.4.2 |
SPV 1: PTv SPV 2: v.CPF + v.MCP + ALMv |
1 | ||
| 2.4.3 |
SPV 1: TPv SPV 2: v.CPF + PTv + ALMv |
1 | ||
| 2.5 (2) | 2.5.2 |
SPV 1: ALMv SPV 2: v.CPF + PTv + TPv + v.MCP |
1 | |
| 2.5.21 |
SPV 1: PTv + ALMv SPV 2: v.CPF + TPv + v.MCP |
1 | ||
| 3 (2) | 3.3 (1) | 3.3.1 |
SPV 1: v.CPF SPV 2: PTv SPV 3: v.MCP |
1 |
| 3.4 (1) | 3.4.1 |
SPV 1: TPv SPV 2: v.MCP SPV 3: PTv + ALMv |
1 |
1A 2-digit code was designated to each configuration of the SPVC, where the first digit implied the number of SPVs and the second digit dictated the total number of the tributaries. The detailed venous combination (individual SPVC anatomical variation) that occurred under the same configuration was numbered consecutively. We referred to each exact individual variation with a 3-digit code. The third digit refers to the number of the venous combination
2This case had a doubled PTv, each one drained into a separate SPV. All other cases of doubled direct tributaries had both veins draining directly into the same SPV, or one of them drained into another direct tributary. For the sake of simplification, we considered these doubled veins as one