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Table 2: MR imaging criteria suggestive of extraligamentous HIVD in the lumbar spine
MR Imaging Criteria Sensitivity (%) Specificity (%) Accuracy (%) PPV (%) NPV (%) Odds Ratio/P Value
Spinal canal compromised for more than half its dimension 30/66 (45.5) 42/51 (82.4) 72/117 (61.5) 30/39 (76.9) 42/78 (53.8) 3.88/.0015
Internal signal difference in HIVD 23/66 (34.8) 42/51 (82.4) 65/117 (55.6) 23/32 (71.9) 42/85 (49.4) 2.49/.0385
Ill-defined margin of HIVD 10/66 (15.2) 49/51 (96.1) 59/117 (50.4) 10/12 (83.3) 49/105 (46.7) 4.37/.0471
Disruption of continuous low-signal-intensity line covering HIVD 38/66 (57.6) 40/51 (78.4) 78/117 (66.7) 38/49 (77.6) 40/68 (58.8) 4.93/<.0001
Presence of internal dark line in HIVD 20/66 (30.3) 46/51 (90.2) 66/117 (56.4) 20/25 (80.0) 46/92 (50.0) 4.00/.0072
Combination of 5 MR imaging criteria 51/66 (77.3) 38/51 (74.5) 89/117 (76.1) 51/64 (79.7) 38/53 (71.7) 9.93/<.0001