What is the term for the implantation of an embryo outside the uterus?

The term for the implantation of an embryo outside the uterus is ectopic pregnancy. This condition most commonly occurs in one of the fallopian tubes, although it can also take place in other areas such as the ovary, abdomen, or cervix. An ectopic pregnancy cannot proceed normally as the environment outside the uterus does not provide the necessary conditions for fetal development, and it poses significant health risks to the pregnant person, including the potential for life-threatening internal bleeding.

In comparison, a missed abortion refers to a situation where a pregnancy stops developing, but the body does not recognize the loss immediately, which is distinct from ectopic pregnancy. Gestational trophoblastic disease involves abnormal growth of trophoblasts, which can lead to complications such as hydatidiform moles, and it is not related to the location of implantation. Lastly, placenta previa is a condition where the placenta partially or wholly covers the cervix, preventing a vaginal delivery, but it is relevant to the implantation within the uterus rather than outside of it.