Early first trimester diagnosis and management of rudimentary horn pregnancy: A rare case report.

Rudimentary horn pregnancy (RHP) is a rare and potentially life-threatening form of ectopic pregnancy that occurs in the context of a unicornuate uterus resulting from incomplete development of 1 Müllerian duct. We present the case of a 31-year-old nulligravida woman diagnosed at 8 weeks and 2 days of amenorrhea with an RHP, initially suspected via pelvic ultrasound and confirmed by laparoscopy. The patient underwent surgical resection of the rudimentary horn containing the pregnancy, with an uneventful postoperative course. RHP often presents with nonspecific symptoms, making early diagnosis difficult, and carries a high risk of uterine rupture and placenta accreta if left untreated. This case highlights the critical role of early ultrasonographic evaluation and emphasizes the importance of prompt surgical intervention to prevent severe maternal morbidity.