Succenturiate lobe of placenta

  • accessory lobe
  • separate mass of chorionic villi connected to main placenta by vessels within membrane

placental villi atrophy in area of inadequate blood supply. proliferation occurs in two opposite directions with fetal vessels remaining in site of atrophy

  • retained in utero with post partum hemorrhage
  • placenta previa with post partum hemorrhage
  • vasa previa