Table 2 Discriminative ability of each sign in differentiating PI + PP from Normal + PA groups.
MRI risk signs (N (%)) | Observer 1 | Observer 2 | k value | ||||||
|---|---|---|---|---|---|---|---|---|---|
Normal + PA (n = 136) | PI + PP (n = 30) | p1 | AUC1 | Normal + PA (n = 136) | PI + PP (n = 30) | p2 | AUC2 | ||
Increased intra-myometrial vascularity | 30 (22%) | 20 (67%) | < 0.0001* | 0.72 | 53 (38%) | 18 (60%) | 0.0289* | 0.61 | 0.28 |
Bulge† | 92 (68%) | 30 (100%) | < 0.0001* | 0.67 | 72 (53%) | 25 (83%) | 0.0022* | 0.65 | 0.23 |
Loss of T2 hypointense interface† | 102 (75%) | 29 (97%) | 0.0023* | 0.61 | 69 (51%) | 21 (70%) | 0.0552 | 0.59 | 0.20 |
Myometrial thinning† | 78 (57%) | 25 (83%) | 0.0053* | 0.63 | 27 (20%) | 16 (53%) | 0.0002* | 0.67 | 0.22 |
Bladder wall interruption† | 11 (8%) | 13 (43%) | < 0.0001* | 0.68 | 4 (3%) | 10 (33%) | < 0.0001* | 0.65 | 0.41 |
Abnormal vascularization of the placental bed† | 56 (41%) | 19 (63%) | 0.0273* | 0.61 | 29 (21%) | 12 (40%) | 0.0337* | 0.59 | 0.21 |
T2 dark band† | 130 (96%) | 29 (97%) | 0.7909 | 0.51 | 68 (50%) | 17 (57%) | 0.5085 | 0.53 | 0.15 |
Focal exophytic mass† | 6 (4%) | 6 (20%) | 0.0084* | 0.58 | 6 (4%) | 6 (20%) | 0.0028* | 0.58 | 0.36 |
