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Table 1:

Arterial components and brain structures surrounding the distal ICA on the affected side versus the contralateral side

Affected Side (n = 20)Contralateral Side (n = 20)P Valuea
A1Dysplasia = 15 (75.0%)Dysplasia = 1 (5.0%).001
M1Dysplasia = 2 (10.0%)Dysplasia = 0 (0.0%).487b
OAEctopic = 5 (25.0%)Ectopic = 1 (5.0%).219
AchoADysplasia = 5 (25.0%)Dysplasia = 0 (0.0%).047b
PcomADysplasia = 14 (70.0%)Dysplasia = 3 (15.0%).003
BA/PCADysplasia = 14 (70.0%)Dysplasia = 1 (5.0%)<.001
MidbrainHypoplasia = 9 (45.0%)Hypoplasia = 0 (0.0%).001b
  • Note:—A1 indicates a segment of the anterior cerebral artery; M1, a segment of the MCA. BA/PCA indicates either BA or PCA, or both.

  • a McNemar test.

  • b Fisher exact test.