An ectopic pregnancy is one where the blastocyst does not implant into endometrium, i.e. within the endometrial cavity.
Possible sites:
(1) fallopian tube
(2) ovary
(3) endocervical canal
(4) within the myometrium (intramural) associated with a cesarean section scar
(5) within the peritoneal cavity
(6) uterine rudimentary horn (without connection to the uterine cavity)
An ectopic site can be suspected when:
(1) there is elevation of the serum or urine HCG
(2) no evidence of a gestational sac is seen within the endometrial cavity
(3) a missed abortion is not suspected
(4) a sac is present in an ectopic site (see above)
(5) fetal heart beat, placental and/or fetal tissue is identified at the site
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Specialty: Obstetrics & Gynecology
