Background and Objective: To determine the
sensitivity and specificity of MRI findings for detecting
of morbidly adherent placenta.
Methods: A retrospective review of the patients who
underwent pelvic MRI during pregnancy between
January 2004 and June 2014. Thirty-one image sets
that met the following inclusion criteria were enrolled
in the study. MR imaging findings included uterine
bulging, intraplacental hemorrhage, placenta
heterogeneity, intraplacental dark bands, present of
myometrium plane were reviewed by two
investigators blinded to pregnancy outcome.
Results: In thirty-one image sets of pelvic MRI in the
pregnant patients. Sensitivity, specificity, PPV, NPV and
kappa value of MRI features had calculated: uterine
bulging (90.9%, 75%, 66.7%, 93.8% and 0.74
respectively); intraplacental hemorrhage (81.8%,
89. 5%, 81. 8%, 89. 5% and 0. 78); placental
heterogeneity (100%, 15%, 39.3%, 100% and 0.34);
intraplacental dark bands (100%, 55%, 55%, 100%
and 0.49); partial/absent myometrium under
placenta (100%, 80%, 73.3%, 100% and 0.83),
respectively.Accuracy of MRI to diagnosed morbidly
adherent placenta was 83.8% (95% CI 66.2%-94.5%)
with moderate interobserver agreement (kappa value
0.58).Conclusion: Uterine bulging, intraplacental
hemorrhage and partial/absent myometrium plane
may be the keys criteria to diagnosis on pelvic MRI.
Placental homogeneity and absent intraplacental dark
band on T2WI may be exclusive criteria