Clinical symptoms and signs of ovarian torsion are often nonspecific, and imaging studies have a crucial role in making an accurate timely diagnosis. Ultrasound with color Doppler is often the initial investigation. However, as illustrated in our case, a normal Doppler study cannot exclude the diagnosis of ovarian torsion, and MRI should be performed if a high degree of concern for ovarian torsion persists. We report a case of a case of an 18-year-old female who was diagnosed with ovarian torsion on MRI. To the best of our knowledge, "whirlpool sign on MRI" has not been reported previously. If this sign is present, a specific diagnosis of ovarian torsion can be made.