Background and Purpose: Pelvic pain and/or abdominal pain are the most common complaints in a gynecological practice, and determination of the origin is often difficult. Not only are there many pathologic entities and functional disorders that cloud the diagnostic picture, but also individual responses to pain and different pain thresholds make localization of pain a diagnostic dilemma. Case report: A 14-year-old girl presented to the emergency department with the chief complaint of pelvic pain. On the day before admission, the girl experienced sudden onset of severe, right lower quadrant pain after lunch. Whole abdominal fullness, tenderness with rebound pain in the right lower quadrant was found. The pelvic ultrasound examination identified an echogenic complex mass measuring 5.4×4.1cm. Laparoscopic intervention showed a dilated, twisted, and necrotic right fallopian tube. Conclusion: Severe lower abdominal pain is difficult to diagnose sometimes. Physicians need to be more careful in the diagnosis of female patients and torsion of the fallopian tube is one of the possibilities to be considered in the differential diagnosis.