title: Case reports: the exceptions that challenge the rules.
authors.forename: G J
authors.initials: GJ
authors.lastname: Burton
authors.forename: D M
authors.initials: DM
authors.lastname: Nelson
mesh_terms: D005260:Female; D006801:Humans; D010920:Placenta / Q000098:blood supply*; D011247:Pregnancy; D011269:Pregnancy, Abdominal / Q000473:pathology*; D055988:Uterine Artery / Q000473:pathology*