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Table 4: 
Vascular segmental location of MRA false-negatives
LocationNumber (n = 19)
A14 (21.1%)
Cavernous carotid3 (15.8%)
M12 (10.5%)
M24 (21.1%)
M41 (5.3%)
P11 (5.3%)
P21 (5.3%)
PcomA1 (5.3%)
Pericallosal2 (10.5%)
  • Note:— MRA indicates MR angiography; PcomA, posterior communicating artery.