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Table 2: 
Signal intensity and enhancement characteristics of 34 chronically thrombosed, partially recanalized venous segments
Signal IntensityT1WIT2WIPD-WIFLAIRGREEnhancementDegree*
Hypointense2 (5.9%)0 (0%)0 (0%)0 (0%)0 (0%)Less5 (15.6%)
Isointense29 (85.3%)1 (3.0%)0 (0%)2 (6.9%)7 (50%)Equal13 (40.6%)
Hyperintense3 (8.8%)33 (97.0%)5 (100%)27 (93.1%)7 (50%)Greater14 (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.