Abstract: Pregnancy of unknown location is a pregnancy state and has a variety of clinical outcomes, such as intrauterine pregnancy, ectopic pregnancy, abortion of pregnancy of unknown location and persisting pregnancy of unknown location. Persisting pregnancy of unknown location is a clinical outcome that is less common in pregnancy of unknown location. Because of its lack of specificity in clinical manifestations and the location of the gestational sac can not be found, so it is difficult to diagnose and easy to be misdiagnosed. If the treatment is not timely, it may endanger the patient′s life because of rupturing of the gestational sac or bleeding or necrotizing of the gestational area. In the clinic, it is usually necessary to combine the blood hCG value, progesterone value and vaginal ultrasound results for diagnosis and treatment. In order to summarize the experience of the diagnosis and treatment of persisting pregnancy of unknown location, and further improve level of the diagnosis and treatment of persisting pregnancy of unknown location, a rare case of persisting pregnancy of unknown location was reported.

Key words: Pregnancy, ectopic, Case reports, Persisting pregnancy of unknown location