Criteria for presumed angular pregnancy

Nonanomalous uterus: not unicornuate, bicornuate, or septate^[1]

Implantation of the embryo in the lateral angle of the uterine cavity, just medial to the uterotubal junction^[2]

No more than 1 cm of myometrial thickness from the gestational sac to the outer border of the uterus

Presence of completely circumferential endometrium surrounding the gestational sac and, therefore, diagnostic of intrauterine gestation^[3]

Lack of an "interstitial line sign"; this is defined as an echogenic line in the upper lateral region of the uterus bordering the gestational sac and is thought to represent the interstitial portion of the fallopian tube^[4]

From: Bollig KJ, Schust DJ. Refining Angular Pregnancy Diagnosis in the First Trimester: A Case Series of Expectant Management. Obstet Gynecol 2020; 135:175. DOI: 10.1097/AOG.0000000000003595. Copyright © 2020 the American College of Obstetricians and Gynecologists. Reproduced with permission from Wolters Kluwer Health. Unauthorized reproduction of this material is prohibited.
References:

Arleo EK, Defilippis EM. Cornual, interstitial, and angular pregnancies: clarifying the terms and a review of the literature. Clin Imaging 2014; 38:763.
Kelly HA. Operative gynaecology. New York, (NY): Appleton; 1898.
Grant A, Murji A, Atri M, Epid D. Can the presence of a surrounding endometrium differentiate eccentrically located intrauterine pregnancy from interstitial ectopic pregnancy? J Obstet Gynaecol Can 2017; 39:627.
Ackerman TE, Levi CS, Dashefsky SM, Holt SC, Lindsay DJ. Interstitial line: sonographic finding in interstitial (cornual) ectopic pregnancy. Radiology 1993; 189:83.

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Criteria for presumed angular pregnancy