Which of the following best describes ectopic pregnancy?

Ectopic pregnancy is best described as a condition where a fertilized egg implants outside the uterus. This typically occurs in the fallopian tubes, but can also happen in other areas such as the cervix, abdominal cavity, or ovaries. The key aspect of an ectopic pregnancy is that it cannot develop normally outside of the uterine environment, leading to potential complications for the mother.

The other options do not accurately represent an ectopic pregnancy. For instance, an ectopic pregnancy does not occur normally within the uterus, which is a typical site for a pregnancy. Describing it as a fetus developing in the abdomen is misleading, as that is not the common site and does not emphasize the critical aspect of improper implantation. Finally, stating that it occurs exclusively in the cervix is too narrow; while implantation can occur in the cervix, ectopic pregnancies are more commonly in the fallopian tubes. Thus, the most accurate and comprehensive description of ectopic pregnancy is that it occurs when a fertilized egg implants outside the uterus.