What is the definition of ectopic pregnancy?

The definition of ectopic pregnancy refers specifically to a pregnancy that occurs outside the uterine cavity. This typically happens when a fertilized egg implants in an area such as the fallopian tubes, ovaries, or even abdominal cavity. Such a situation poses significant health risks because the structures outside the uterus are not designed to accommodate a growing embryo, leading to potential complications like rupture and internal bleeding.

The other choices, while related to pregnancy, do not accurately define ectopic pregnancy. For example, the option regarding pregnancy occurring within the uterus describes a normal pregnancy. The option about miscarriage pertains to pregnancies that do not come to term, rather than the location of implantation. Lastly, labeling a pregnancy as high-risk does not specifically relate to the location of the implantation, as many factors can contribute to a pregnancy being classified as high-risk. Therefore, option A accurately captures the central aspect of ectopic pregnancy.