Table 4 Rare non-tubal implantation sites of ectopic pregnancy (EP)
Site | Frequency | Features |
|---|---|---|
Interstitial EP | 2–4% of cases | Implantation of the gestational sac in the interstitial or intramyometrial segment of the fallopian tube |
Ovarian EP | Up to 3% of cases | Fertilized ovum is retained in the ovary |
Abdominal EP | 0.9–1.4% of cases | Implantation of fertilised ovum anywhere on the peritoneal surface or abdominal viscera |
Cornual EP | < 1% of cases | Implantation of a blastocyst within the cornua of a bicornuate or septate uterus |
Cervical EP | < 1% of cases | Implantation of the blastocyst within the endocervical canal |
Caesarean scar EP | < 1% of cases | Implantation of a blastocyst at the site of a prior caesarean scar |
Intramural EP | < 1% of cases | Gestational sac located within the uterine wall, completely surrounded by the myometrium and separated from the endometrial cavity |
Heterotopic pregnancy | - Spontaneous conception: extremely rare - After assisted reproduction: 1–3% of patients | Concomitant presence of intrauterine and ectopic pregnancies |