Results
The pre-evaluated κ-values of inter- and intra-observer errors were 0.76 and 0.88, respectively. Thirty-four pregnant women admitted to the MFICU (Maternal-fetal intensive care unit) in our hospital were enrolled. The characteristics of the participants are presented in Table 1 . The median maternal age was 33.5 years. The participants included 19 cases of FGR and/or preeclampsia and 15 cases of admissions due to other indications; in these cases, the median gestational age at ultrasound examination was 34 and 33 weeks of gestation, respectively.
The comparisons of SMI findings with histological findings are presented in Table 2 . The accuracy of antenatal ultrasound detection of placental pathological findings and ROC curves are presented inTable 3 and Figure 4 . The most accurate diagnostic finding was placental infarction in cases with FGR (PPV, 100%; sensitivity, 88.9%; AUC, 0.945), whereas PPV, sensitivity, and AUC in cases with preeclampsia were relatively low. PPV, sensitivity, and AUC for avascular villi were 100%, 57.1%, and 0.785 in cases with FGR, 66.7%, 66.7%, and 0.780 in cases with preeclampsia, and 80%, 80%, and 0.920, respectively.