tubo-ovarian abscess in a virgin girl

background: tubo-ovarian abscess as a serious complication of pelvic inflammatory disease is very uncommon in sexually inactive girls. case: we report a case of tubo-ovarian abscess in a 24-year-old sexually inactive girl with transverse vaginal septum who was presented with abdominal pain and a pelvic mass and without prior surgical history and no evidences of appendicitis, inflammatory bowel disease, or cancer. a huge unilateral tubo-ovarian abscess was recognized at laparotomy. unilateral salpingoophorectomy, hysterectomy and postoperative antibiotic therapy cured the patient. conclusion: early diagnosis and treatment are essential to prevent further sequel including infertility, ectopic pregnancy, and chronic pelvic pain which cause morbidity.