Signal intensity and enhancement characteristics of 34 chronically thrombosed, partially recanalized venous segments
| Signal Intensity | T1WI | T2WI | PD-WI | FLAIR | GRE | Enhancement | Degree* |
|---|---|---|---|---|---|---|---|
| Hypointense | 2 (5.9%) | 0 (0%) | 0 (0%) | 0 (0%) | 0 (0%) | Less | 5 (15.6%) |
| Isointense | 29 (85.3%) | 1 (3.0%) | 0 (0%) | 2 (6.9%) | 7 (50%) | Equal | 13 (40.6%) |
| Hyperintense | 3 (8.8%) | 33 (97.0%) | 5 (100%) | 27 (93.1%) | 7 (50%) | Greater | 14 (43.8%) |
Note:—34 segments were imaged with T1-weighted (T1WI) and fast spin-echo T2-weighted (T2WI) sequences, 29 segments were imaged using fluid-attenuated inversion recovery sequences (FLAIR), 7 segments with proton density weighted sequences (PD-WI), and 14 segments with gradient recalled-echo (GRE) sequences. Thrombus signal intensity was graded relative to normal gray matter.
* Enhancement was graded as less than, equal to, or greater than venographically normal sinus enhancement.