Final answer:
Ectopic pregnancy refers to the implantation of an embryo outside the uterus. The incidence is approximately 1-2% of all pregnancies. Ultrasonography can help diagnose ectopic pregnancies.
Step-by-step explanation:
An ectopic pregnancy refers to the implantation of an embryo outside the uterus, which can lead to complications. The incidence of ectopic pregnancy is approximately 1-2% of all pregnancies. When it comes to the percentage of ectopic pregnancies presenting to an Early Pregnancy Assessment Centre (EPAC), precise data may vary, but it is an important destination for the evaluation and management of ectopic pregnancies. Ultrasonography (USG) can help diagnose ectopic pregnancies by detecting abnormal findings such as the absence of a gestational sac in the uterus, the presence of a gestational sac in the fallopian tube or ovary, or other abnormal structures.