Skip to main content

Table 4 Rare non-tubal implantation sites of ectopic pregnancy (EP)

From: Cross-sectional imaging of acute gynaecologic disorders: CT and MRI findings with differential diagnosis—part I: corpus luteum and haemorrhagic ovarian cysts, genital causes of haemoperitoneum and adnexal torsion

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