Case report of a pubertal female patient with clinical signs of hypogastric pain initiated with the menarche, dysmenorrhoea and a palpable pelvic mass. The suspected clinical signs, ultrasound scans, urographies and CAT, confirmed the existence of an uterovaginal duplicity with right hematocolpos due to imperforate septum and pool of menstrual blood, as well as ipsilateral renal agenesis. The vagina examination and resection of the septum under sedation solved the case.