title: Imaging Unusual Pregnancy Implantations: Rare Ectopic Pregnancies and More.
abstract: OBJECTIVE
  The purpose of this article is to review key clinical issues and imaging features of unusual pregnancy implantations. Examples from different imaging modalities are provided to increase interpreting physicians' familiarity with the appearance and potential complications of unusual ectopic, cesarean scar, heterotopic, and rudimentary horn pregnancies.
  
  
  CONCLUSIONS
  Abnormal pregnancy implantations are life-threatening. Interpreting physicians' familiarity with the appearance of unusual pregnancy implantations is critical for early identification and initiation of appropriate therapy.
authors: 1 Department of Diagnostic Imaging, Alpert Medical School of Brown University, Rhode Island Hospital, Third Fl Main Bldg, 593 Eddy St, Providence, RI 02903.
authors: Elizabeth H
authors: EH
authors: Dibble
authors: 1 Department of Diagnostic Imaging, Alpert Medical School of Brown University, Rhode Island Hospital, Third Fl Main Bldg, 593 Eddy St, Providence, RI 02903.
authors: Ana P
authors: AP
authors: Lourenco
mesh_terms: D002585:Cesarean Section / Q000009:adverse effects*; D002921:Cicatrix / Q000000981:diagnostic imaging* / Q000209:etiology; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D011247:Pregnancy; D011271:Pregnancy, Ectopic / Q000175:diagnosis / Q000000981:diagnostic imaging* / Q000209:etiology*; D035583:Rare Diseases; D016216:Ultrasonography, Prenatal / Q000379:methods*
keywords: abdominal ectopic pregnancy; cervical ectopic pregnancy; cesarean scar pregnancy; heterotopic pregnancy; interstitial ectopic pregnancy; ovarian ectopic pregnancy; rudimentary horn pregnancy