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Table 1: 
Cross table of the A1 segment and PcomA flow on MRA and VE-ASL
MRAVE-ASLTotal
No FlowNormal FlowAbnormal Flow
A1 segment
    No flow16 (28.6%)0 (0.0%)0 (0.0%)16 (28.6%)
    Normal flow6 (10.7%)32 (57.1%)0 (0.0%)38 (67.9%)
    Abnormal flow0 (0.0%)0 (0.0%)2 (3.6%)2 (3.6%)
    Total22 (39.3%)32 (57.1%)2 (3.6%)56 (100.0%)
PcomA
    No flow24 (42.9%)4 (7.1%)3 (5.4%)31 (55.4%)
    Normal flow3 (5.4%)16 (28.6%)0 (0.0%)19 (33.9%)
    Abnormal flow0 (0.0%)0 (0.0%)6 (10.7%)6 (10.7%)
    Total27 (48.2%)20 (35.7%)9 (16.1%)56 (100.0%)
  • Note:—PcomA indicates posterior communicating artery; MRA, MR angiography; VE-ASL, vessel-encoded arterial spin-labeling.