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Ultrasound of Interstitial Ectopic Pregnancy

In this radiology lecture, we review the ultrasound appearance of interstitial ectopic pregnancy! Key teaching points include: 1) Interstitial ectopic pregnancies are rare, occurring in proximal (interstitial) portion of fallopian tube within muscle wall of uterus 2) Much less common than tubal ectopic pregnancy occurring in the more distal ampullary and isthmic portions of fallopian tube 3) Interstitial ectopic pregnancies are important because higher morbidity and mortality due to risk of life-threatening hemorrhage 4) Abnormally eccentric gestational sac with thin surrounding myometrium: less than 5 mm myometrial thickness highly suspicious 5) “Interstitial line” sign: Thin echogenic line extending from endometrial cavity to ectopic gestational sac. Thought to represent interstitial portion of tube separating the ectopic pregnancy from the endometrium 6) Medical: Systemic MTX, may also be injected into sac 7) Surgery: Cornual wedge resection when ruptured versus hysterectomy 8) Can be confused with angular pregnancy: Rare, intrauterine pregnancy with implantation eccentrically high at the lateral angle of uterine cavity. More medial than interstitial ectopic pregnancies. No interstitial line sign, and greater than 5 mm thickness of overlying myometrial mantle 9) Angular pregnancy can result in normal pregnancy, but increased risk of miscarriage and uterine rupture. Should be followed closely to ensure growth towards endometrial cavity 10) Angular pregnancy is sometimes referred to as a “cornual pregnancy,” but controversial as earliest use of term cornual pregnancy refers to intrauterine implantations in anomalous unicornuate, bicornuate or septate uteri. To avoid confusion, best to specifically describe whether the gestational sac is intrauterine or ectopic To learn more about the Samsung RS85 Prestige ultrasound system, please visit: https://www.bostonimaging.com/rs85-pr... Click the YouTube Community tab or follow on social media for bonus teaching material posted throughout the week! Website: https://Radquarters.com/ Spotify Video Podcast: https://spoti.fi/462r0F2 Apple Video Podcast: https://apple.co/3ZhHuGu Instagram:   / radquarters   Facebook:   / radquarters   X (Twitter):   / radquarters   Reddit:   / radiologisthq