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An ectopic pregnancy that implants within the intramural portion of the fallopian tube is referred to as an interstitial pregnancy.
This portion of the uterus is highly vascular and is prone to excessive hemorrhage.
¡ Interstitial pregnancies are considered potentially life threatening because the pregnancy may progress normally until spontaneous rupture occurs.
¡ In the presence of an interstitial pregnancy, sonography will yield a gestational sac that is located in the superolateral portion of the uterus.
¡ Care must be taken to assess the amount of myometrium surrounding the gestation.
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