Ruptured Rudimentary Horn Pregnancy Revealed on Emergency Laparotomy: A Case of Primigravida Presenting in a Developing Country.

Developmental defects in the Mullerian ducts can result in several uterine anomalies including a unicornuate uterus with a rudimentary horn. Pregnancy in a rudimentary horn is extremely rare occurring in 1:76,000-1:160,000 pregnancies. We present a case of an 18-year-old primigravida with a ruptured rudimentary horn pregnancy (RHP) presenting as acute abdomen at 17 weeks of gestation. Hemodynamic instability led us to perform a life-saving emergency laparotomy. A 1.5 liters hemoperitoneum was encountered with a ruptured non-communicating rudimentary horn. Excision of the horn and unilateral salpingectomy was performed. In addition to ectopic pregnancy and appendicitis, rare uterine anomalies must also be considered in patients presenting with an acute abdomen especially after 10 weeks of gestation. Basic diagnostic facilities may not be available in developing countries. Therefore, clinicians must be aware of this rare entity in order to manage such patients efficiently.