Final answer:
Ectopic pregnancies, primarily tubal pregnancies, involve implantation of the embryo outside the uterus, often causing pain and bleeding, and requiring treatment with methotrexate or surgery.
Step-by-step explanation:
Ectopic pregnancies are a type of pregnancy where the embryo implants outside of the uterus. The most common form is a tubal pregnancy, in which the embryo implants in the uterine tube. Other rare forms include ovarian and abdominal ectopic pregnancies. Symptoms of an ectopic pregnancy can often mirror those of a regular pregnancy in the early stages but may progress to include sharp or stabbing pain, vaginal bleeding, gastrointestinal symptoms, and weakness or dizziness due to blood loss.
Treatment for an ectopic pregnancy depends on various factors, including the location and stage of the pregnancy. If detected early, a medication called methotrexate can be used to stop the growth of the embryo. However, surgical intervention may be necessary, particularly if the pregnancy has caused a ruptured fallopian tube, posing immediate health risks to the patient.
In summary, tubal pregnancies may be caused by scar tissue from infections, and can resolve spontaneously or may require medical or surgical treatment.