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TABLE 2: 
Degree of Stenosis at DSA in 102 Flow Voids on Time-of-flight MRA Images
Degree of Stenosis at DSAFlow Voids (n = 102)
0–49%3 (2.9)
50–69%11 (10.8)
70–99%*86 (84.3)
100% (occlusion)2 (2.0)
  • Note.—Data in parentheses are percentages.
  • * In the group of severe (70–99%) stenosis, nine cases of slow flow or the string sign were recorded, according to the DSA findings. These were graded as 99% stenoses.