Early detection of ectopic pregnancy visualizing the presence of a tubal ring with ultrasonography performed by emergency physicians

Early diagnosis of ectopic pregnancy (EP) continues to be problematic for emergency physicians. With the increasing availability of endovaginal ultrasonography (EVS) for emergency physicians, recognizing additional EVS findings, ie, the presence of a tubal ring, in patients with risk factors or clinical presentation for EP can assist the emergency physician in diagnosing EP. (Am J Emerg Med 2000;18:444-448.