TY - JOUR
T1 - Placental recess accompanied by a T2 dark band
T2 - a new finding for diagnosing placental invasion
AU - Sato, Tomomi
AU - Mori, Naoko
AU - Hasegawa, Osamu
AU - Shigihara, Takeshi
AU - Fujimori, Keiya
AU - Tasaki, Kazuhiro
AU - Shishido, Fumio
N1 - Publisher Copyright:
© 2017, Springer Science+Business Media New York.
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2017/8/1
Y1 - 2017/8/1
N2 - Purpose: Our aim was to assess the usefulness of a new magnetic resonance imaging (MRI) finding, the placental recess, for diagnosing placental invasion. Methods: This retrospective study included 51 patients (mean age 34.1 years, range 26–43 years) with suspected placental invasion who underwent cesarean section. Preoperative MRI was performed using a 1.5-T unit and included axial, sagittal, and coronal T2-weighted imaging (T2WI) with half-Fourier fast spin-echo sequences. Overall, 9 patients showed placental invasion, and 42 did not. Placental recess was defined as a placental deformity with contraction of the placental surface and outer rim of the uterus accompanied by a T2 dark band. Two radiologists independently assessed the presence of the placental recess and conventional findings including uterine bulging, abnormal placental vascularity, placental heterogeneous intensity on T2-weighted imaging (T2WI), and the T2 dark band. Fisher’s two-sided exact test was used to compare findings between patients with and without placental invasion. Interobserver reliability was assessed using the kappa statistic. Results: MRI features had interobserver reliability of >0.40. Placental recess yielded the highest kappa value (0.898). Significant differences were identified between patients with and without placental invasion regarding abnormal placental vascularity, placental heterogeneous intensity, a T2 dark band, and the placental recess on T2WI (p = 0.0282, 0.0003, 0.0003, <0.0001, respectively). The placental recess had sensitivity, specificity, positive and negative predictive values, and accuracy of 56, 100, 100, 91, and 92%, respectively. Conclusion: The placental recess was useful for diagnosing placental invasion, with high interobserver variability and accuracy.
AB - Purpose: Our aim was to assess the usefulness of a new magnetic resonance imaging (MRI) finding, the placental recess, for diagnosing placental invasion. Methods: This retrospective study included 51 patients (mean age 34.1 years, range 26–43 years) with suspected placental invasion who underwent cesarean section. Preoperative MRI was performed using a 1.5-T unit and included axial, sagittal, and coronal T2-weighted imaging (T2WI) with half-Fourier fast spin-echo sequences. Overall, 9 patients showed placental invasion, and 42 did not. Placental recess was defined as a placental deformity with contraction of the placental surface and outer rim of the uterus accompanied by a T2 dark band. Two radiologists independently assessed the presence of the placental recess and conventional findings including uterine bulging, abnormal placental vascularity, placental heterogeneous intensity on T2-weighted imaging (T2WI), and the T2 dark band. Fisher’s two-sided exact test was used to compare findings between patients with and without placental invasion. Interobserver reliability was assessed using the kappa statistic. Results: MRI features had interobserver reliability of >0.40. Placental recess yielded the highest kappa value (0.898). Significant differences were identified between patients with and without placental invasion regarding abnormal placental vascularity, placental heterogeneous intensity, a T2 dark band, and the placental recess on T2WI (p = 0.0282, 0.0003, 0.0003, <0.0001, respectively). The placental recess had sensitivity, specificity, positive and negative predictive values, and accuracy of 56, 100, 100, 91, and 92%, respectively. Conclusion: The placental recess was useful for diagnosing placental invasion, with high interobserver variability and accuracy.
KW - Placenta accreta
KW - Placenta increta
KW - Placenta percreta
KW - Placental invasion
KW - Placental recess
KW - T2 dark band
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U2 - 10.1007/s00261-017-1100-0
DO - 10.1007/s00261-017-1100-0
M3 - Article
C2 - 28293719
AN - SCOPUS:85015215103
VL - 42
SP - 2146
EP - 2153
JO - Abdominal Radiology
JF - Abdominal Radiology
SN - 2366-004X
IS - 8
ER -