Isolated tubal torsion accompanying pregnancy is an extremely rare condition. Preoperative diagnosis is generally difficult; most of the cases can be diagnosed intraoperatively. Here, we reported a 36-week pregnant with a complaint of acute pain in right lower quadrant that emanating to right lomber region. Abdominal utrasonography showed grade 3 hydronephrosis in right kidney, other findings were normal. A cesarean section was carried out and a twisted right tube were diagnosed. Right ovary was normal in appearance. The torsioned tube compressed the right ureter and caused ureteral dilatation. Right salpingectomy was performed. Postoperative follow-up of the patient was uneventful.