title: Migrating placenta previa.
abstract: A case of third trimester bleeding from placenta previa is presented in which serial ultrasonograms were obtained from the 30th to the 36th gestational week and confirmed by isotopic scanning. Evidence is presented showing a migration of a placenta previa marginalis away from the cervical os followed by vaginal delivery at term. The concept and mechanism of placental migration are reviewed.
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D010923:Placenta Previa / Q000175:diagnosis*; D011247:Pregnancy; D014463:Ultrasonography