Objective: The purpose of this series is to describe the sonographic features of isolated torsion of the fallopian tube.
Methods: Sonography was performed in 4 women with acute lower abdominal pain.
Results: The uterus and ovaries were normal in the 4 women. The ipsilateral fallopian tube was distended with fluid. A round mass was seen close to the tube. A sonographic whirlpool sign was seen on rocking movement of the probe over the mass. Ipsilateral torsion of the fallopian tube was confirmed at surgery in all of them.
Conclusion: The sonographic whirlpool sign is the specific sign of tubal torsion.