• Haider Jan, Michael Katesmark, and Vishalli Ghai.
• Department of Obstetrics and Gynaecology, Epsom & St. Helier's University Hospitals NHS Trust, Dorking Road, United Kingdom (all authors).
• J Minim Invasive Gynecol. 2019 May 1; 26 (4): 600-601.

Study ObjectiveTo demonstrate our approach to laparoscopic excision of a noncommunicating rudimentary horn (AmericanSociety for Reproductive Medicine classification II(b), European Society of Human Reproduction and Embryology/European Society of Gynaecological Endoscop classification class U4a).DesignTechnical video (Canadian Task Force classification level III).SettingUniversity Hospital.PatientA 25-year-old women with a left-sided pelvic mass.InterventionLaparoscopic excision of noncommunicating rudimentary horn with hysteroscopy and cystoscopy. Institutional Review Board/Ethics Committee ruled that approval was not required for this study.Measurements And Main ResultsNoncommunicating rudimentary horns are present in 20% to 25% of women with a unicornuate uterus [1]. Noncommunicating rudimentary horns may be associated with dysmenorrhea, pelvic pain, subfertility, and poor obstetric outcomes. Laparoscopic excision of rudimentary horns can be challenging and complex. Factors to consider in relation to the rudimentary horn are attachment to the uterus, presence and course of the ureter, and vascular supply. In this video we demonstrate our approach to laparoscopic excision of a rudimentary horn including preoperative imaging to plan surgical care. A 25-year-old women presented with pelvic pain and underwent a laparotomy for a left-sided pelvic mass. Intraoperatively, a rudimentary horn was suspected, and she was started on a gonadotropin-releasing hormone analogue pending diagnostic imaging and definitive surgery. Computed tomography demonstrated an absent left kidney and ureter. Intraoperatively, we began with a cystoscopy to identify and confirm an efflux from ureteral openings. A real-time hysteroscopy was performed to identify the unicornuate uterus from the rudimentary horn and to exclude vaginal or cervical anomalies. Through hysteroscopic transillumination the plane of dissection was identified between the rudimentary horn and uterus [2,3]. This technique is especially useful when the rudimentary horn is densely fused to the unicornuate uterus. Retroperitoneal dissection was performed ipsilateral to the rudimentary horn. A lateral approach was used to coagulate the uterine artery at its origin. The bladder was reflected from the horn to allow excision. A Thunderbeat device (Olympus Medical Systems, Tokyo, Japan) was used to excise the rudimentary horn, keeping very close to the specimen to ensure no penetration of the unicornuate uterus. Hemostasis was achieved, and no additional sutures were required. The specimen was removed using in-bag morcellation.ConclusionA stepwise hysteroscopic and laparoscopic approach can be used to safely resect a rudimentary horn as demonstrated by this case.Crown Copyright © 2018. Published by Elsevier Inc. All rights reserved.

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