link
Bookmarks
Placenta Previa
Roya Sohaey, MD
To access 4,300 diagnoses written by the world's leading experts in radiology, please log in or subscribe.Log inSubscribe
0
7
0
3

KEY FACTS

  • Terminology

    • Imaging

      • Top Differential Diagnoses

        • Clinical Issues

          • Diagnostic Checklist

            TERMINOLOGY

            • Abbreviations

              • Placenta previa (PP)
              • Low-lying placenta (LLP)
            • Definitions

              • Placenta extending to or covering internal os (IO) after 16 weeks
                • Abnormal placental implantation in lower uterine segment (LUS)
                • ↑ risk of maternal and fetal morbidity
              • New revised classification with 3 categories only
                • PP: Placenta covers IO
                • LLP: Placenta edge ≤ 2 cm from IO
                • Normal: Placenta edge > 2 cm from IO
              • Previous classification with marginal and partial PP deemed confusing

            IMAGING

            • General Features

              • Ultrasonographic Findings

                • Imaging Recommendations

                  DIFFERENTIAL DIAGNOSIS

                    PATHOLOGY

                    • General Features

                      • Staging, Grading, & Classification

                        CLINICAL ISSUES

                        • Presentation

                          • Demographics

                            • Natural History & Prognosis

                              • Treatment

                                DIAGNOSTIC CHECKLIST

                                • Consider

                                  • Image Interpretation Pearls

                                    • Reporting Tips

                                      Selected References

                                      1. Silver RM: Abnormal placentation: placenta previa, vasa previa, and placenta accreta. Obstet Gynecol. 126(3):654-68, 2015
                                      2. Quant HS et al: Transabdominal ultrasonography as a screening test for second-trimester placenta previa. Obstet Gynecol. 123(3):628-33, 2014
                                      3. Reddy UM et al: Fetal imaging: executive summary of a joint Eunice Kennedy Shriver National Institute of Child Health and Human Development, Society for Maternal-Fetal Medicine, American Institute of Ultrasound in Medicine, American College of Obstetricians and Gynecologists, American College of Radiology, Society for Pediatric Radiology, and Society of Radiologists in Ultrasound Fetal Imaging Workshop. J Ultrasound Med. 33(5):745-57, 2014
                                      4. Räisänen S et al: Placenta previa and the risk of delivering a small-for-gestational-age newborn. Obstet Gynecol. 124(2 Pt 1):285-91, 2014
                                      5. Bronsteen R et al: Effect of a low-lying placenta on delivery outcome. Ultrasound Obstet Gynecol. 33(2):204-8, 2009
                                      6. Oppenheimer LW et al: A new classification of placenta previa: measuring progress in obstetrics. Am J Obstet Gynecol. 201(3):227-9, 2009
                                      7. Oyelese Y: Placenta previa: the evolving role of ultrasound. Ultrasound Obstet Gynecol. 34(2):123-6, 2009
                                      8. Shukunami K et al: A small-angled thin edge of the placenta predicts abnormal placentation at delivery. J Ultrasound Med. 24(3):331-5, 2005
                                      9. Bhide A et al: Recent advances in the management of placenta previa. Curr Opin Obstet Gynecol. 16(6):447-51, 2004
                                      10. Chama CM et al: From low-lying implantation to placenta praevia: a longitudinal ultrasonic assessment. J Obstet Gynaecol. 24(5):516-8, 2004
                                      11. Moodley J et al: Imaging techniques to identify morbidly adherent placenta praevia: a prospective study. J Obstet Gynaecol. 24(7):742-4, 2004
                                      12. Weerasekera DS: Placenta praevia and scarred uterus - an obstetrician's dilemma. J Obstet Gynaecol. 20(5):484-5, 2000
                                      13. Sunna E: Transvaginal and transabdominal ultrasound for the diagnosis of placenta praevia. J Obstet Gynaecol. 19(2):152-4, 1999
                                      14. Ziadeh A T Abu-Heija M F El-Jallad M: Placental praevia and accreta: an analysis of two-years' experience. J Obstet Gynaecol. 19(6):584-6, 1999
                                      15. Smith RS et al: Transvaginal ultrasonography for all placentas that appear to be low-lying or over the internal cervical os. Ultrasound Obstet Gynecol. 9(1):22-4, 1997
                                      16. Lauria MR et al: The use of second-trimester transvaginal sonography to predict placenta previa. Ultrasound Obstet Gynecol. 8(5):337-40, 1996
                                      17. Wing DA et al: Management of the symptomatic placenta previa: a randomized, controlled trial of inpatient versus outpatient expectant management. Am J Obstet Gynecol. 175(4 Pt 1):806-11, 1996
                                      Related Anatomy
                                      Loading...
                                      Related Differential Diagnoses
                                      Loading...
                                      References
                                      Tables

                                      Tables

                                      KEY FACTS

                                      • Terminology

                                        • Imaging

                                          • Top Differential Diagnoses

                                            • Clinical Issues

                                              • Diagnostic Checklist

                                                TERMINOLOGY

                                                • Abbreviations

                                                  • Placenta previa (PP)
                                                  • Low-lying placenta (LLP)
                                                • Definitions

                                                  • Placenta extending to or covering internal os (IO) after 16 weeks
                                                    • Abnormal placental implantation in lower uterine segment (LUS)
                                                    • ↑ risk of maternal and fetal morbidity
                                                  • New revised classification with 3 categories only
                                                    • PP: Placenta covers IO
                                                    • LLP: Placenta edge ≤ 2 cm from IO
                                                    • Normal: Placenta edge > 2 cm from IO
                                                  • Previous classification with marginal and partial PP deemed confusing

                                                IMAGING

                                                • General Features

                                                  • Ultrasonographic Findings

                                                    • Imaging Recommendations

                                                      DIFFERENTIAL DIAGNOSIS

                                                        PATHOLOGY

                                                        • General Features

                                                          • Staging, Grading, & Classification

                                                            CLINICAL ISSUES

                                                            • Presentation

                                                              • Demographics

                                                                • Natural History & Prognosis

                                                                  • Treatment

                                                                    DIAGNOSTIC CHECKLIST

                                                                    • Consider

                                                                      • Image Interpretation Pearls

                                                                        • Reporting Tips

                                                                          Selected References

                                                                          1. Silver RM: Abnormal placentation: placenta previa, vasa previa, and placenta accreta. Obstet Gynecol. 126(3):654-68, 2015
                                                                          2. Quant HS et al: Transabdominal ultrasonography as a screening test for second-trimester placenta previa. Obstet Gynecol. 123(3):628-33, 2014
                                                                          3. Reddy UM et al: Fetal imaging: executive summary of a joint Eunice Kennedy Shriver National Institute of Child Health and Human Development, Society for Maternal-Fetal Medicine, American Institute of Ultrasound in Medicine, American College of Obstetricians and Gynecologists, American College of Radiology, Society for Pediatric Radiology, and Society of Radiologists in Ultrasound Fetal Imaging Workshop. J Ultrasound Med. 33(5):745-57, 2014
                                                                          4. Räisänen S et al: Placenta previa and the risk of delivering a small-for-gestational-age newborn. Obstet Gynecol. 124(2 Pt 1):285-91, 2014
                                                                          5. Bronsteen R et al: Effect of a low-lying placenta on delivery outcome. Ultrasound Obstet Gynecol. 33(2):204-8, 2009
                                                                          6. Oppenheimer LW et al: A new classification of placenta previa: measuring progress in obstetrics. Am J Obstet Gynecol. 201(3):227-9, 2009
                                                                          7. Oyelese Y: Placenta previa: the evolving role of ultrasound. Ultrasound Obstet Gynecol. 34(2):123-6, 2009
                                                                          8. Shukunami K et al: A small-angled thin edge of the placenta predicts abnormal placentation at delivery. J Ultrasound Med. 24(3):331-5, 2005
                                                                          9. Bhide A et al: Recent advances in the management of placenta previa. Curr Opin Obstet Gynecol. 16(6):447-51, 2004
                                                                          10. Chama CM et al: From low-lying implantation to placenta praevia: a longitudinal ultrasonic assessment. J Obstet Gynaecol. 24(5):516-8, 2004
                                                                          11. Moodley J et al: Imaging techniques to identify morbidly adherent placenta praevia: a prospective study. J Obstet Gynaecol. 24(7):742-4, 2004
                                                                          12. Weerasekera DS: Placenta praevia and scarred uterus - an obstetrician's dilemma. J Obstet Gynaecol. 20(5):484-5, 2000
                                                                          13. Sunna E: Transvaginal and transabdominal ultrasound for the diagnosis of placenta praevia. J Obstet Gynaecol. 19(2):152-4, 1999
                                                                          14. Ziadeh A T Abu-Heija M F El-Jallad M: Placental praevia and accreta: an analysis of two-years' experience. J Obstet Gynaecol. 19(6):584-6, 1999
                                                                          15. Smith RS et al: Transvaginal ultrasonography for all placentas that appear to be low-lying or over the internal cervical os. Ultrasound Obstet Gynecol. 9(1):22-4, 1997
                                                                          16. Lauria MR et al: The use of second-trimester transvaginal sonography to predict placenta previa. Ultrasound Obstet Gynecol. 8(5):337-40, 1996
                                                                          17. Wing DA et al: Management of the symptomatic placenta previa: a randomized, controlled trial of inpatient versus outpatient expectant management. Am J Obstet Gynecol. 175(4 Pt 1):806-11, 1996