ABSTRACT
Thinking of the diagnosis of complicated uterine malformation in case of acute abdominal pain. In our case, the patient was holding a unicornuate uterus and was admitted for abdominal pain. The etiological diagnosis was performed during laparotomy leading to hemi-hysterectomy. The unicornuate uterus with rudimentary horn results of a failure of the mullerian ducts. This malformation is discovered during examinations for infertility or after acute complication. The diagnosis is established by imaging [ultrasonography and magnetic resonance imaging] and laparoscopy. Although rare, these malformations should be evocated when patient present abdominal pain and justify the surgical excision of the rudimentary horn to prevent complications [endometriosis, sever dysmenorrhea, rupture of ectopic pregnancy in a rudimentary uterine horn]