Pregnancy in a rudimentary horn of the uterus is a very rare type of ectopic pregnancy.[1][2][3] This type of pregnancy can be life-threatening, as the rudimentary horn is not meant to sustain a pregnancy and is at risk of rupturing.[4]
Unicornuate uterus with rudimentary horn is a type of congenital uterine anomaly that arises when one of the Müllerian ducts fails to develop fully, resulting in a small rudimentary horn on one side of the uterus. Different terms have been used in the literature to describe the rudimentary horn, such as uterus bicornis with accessory horn, uterus bicornis unicollis with rudimentary horn, uterus bicornis unicollis with atretic horn, hernia uterus inguinale, and Roberts uterus.[5]
^Dahiya, Krishna; Duhan, Nirmala; Nanda, Smiti (2011). "Rudimentary Horn Pregnancy: Series of Four Cases and Review of the Literature". Journal of Gynecologic Surgery. 27 (3). Mary Ann Liebert Inc: 139–141. doi:10.1089/gyn.2010.0032. ISSN1042-4067.