Cervical pregnancy, resulting from implantation of the blastocyst within the cervical canal, is a rare condition that could previously only be diagnosed after uncontrollable hemorrhage and hysterectomy. However, ultrasonography now permits the early diagnosis, but some limits still exist. This paper reports the case of a patient initially suspected of an inevitable abortion in the preoperative ultrasonography, but was finally diagnosed as having a cervical pregnancy with placenta accreta. If we are able to distinguish cervical pregnancy from early spontaneous abortion, we can preserve the patient`s reproductive function. Successful treatment requires not only an early diagnosis but also prompt intervention and the control of bleeding.