Table 1

 Sensitivity and specificity of the hyperdense middle cerebral artery (HMCA) and MCA “dot” sign using 3D TOF MRA as the gold standard

SensitivitySpecificity
Two patients had both M1 and M2 flow signal abnormalities.
M1 stemHMCA sign presentHMCA sign absent
    Occluded, n (n = 25)7180.280.96
    Patent, n (n = 75)372(95% CI 0.12 to 0.49)(95% CI 0.88 to 0.99)
M2 branchMCA “dot” sign presentMCA “dot” sign absent
    Occluded, n (n = 24)11130.460.89
    Patent, n (n = 76)868(95% CI 0.26 to 0.67)(95% CI 0.80 to 0.95)