Recanalization and fistulization of the fallopian tubes are thought to be the causes of pregnancies following female sterilization.
D005187:Fallopian Tubes / Q000473:pathology*; D005260:Female; D006801:Humans; D011247:Pregnancy; D011271:Pregnancy, Ectopic / Q000209:etiology*; D013246:Sterilization, Tubal