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Table 3: 
Predictive value of CT versus MRI versus CT and MR myelography
Pseudomeningoceles with Absent RootletsAll Pseudomeningoceles
CTMRICT and MRICTMRICT and MRI
Sensitivity0.680.680.680.730.680.68
Specificity0.960.970.970.960.970.97
Positive predictive value0.830.880.880.840.880.88
Negative predictive value0.90.90.90.920.90.9
Likelihood ratio1722.722.71822.722.7