The whirlpool sign or whirl sign of ovarian torsion is characterized by the appearances of a twisted ovarian pedicle seen on US or even on CT.
The term whirlpool sign is used in other contexts: see whirlpool sign (disambiguation).
It appears as twisting of the thickened vascular pedicle of the enlarged ovary. It can be detected on ultrasound confirming the diagnosis along with the other suggestive imaging features and clinical presentation 2. On MRI, it is best demonstrated on axial T2 and T1 C+ fat sat sequences 1.
- 1. Duigenan S, Oliva E, Lee SI. Ovarian torsion: diagnostic features on CT and MRI with pathologic correlation. AJR Am J Roentgenol. 2012;198 (2): W122-31. doi:10.2214/AJR.10.7293 - Pubmed citation
- 2. Vijayaraghavan SB. Sonographic whirlpool sign in ovarian torsion. (2004) Journal of ultrasound in medicine : official journal of the American Institute of Ultrasound in Medicine. 23 (12): 1643-9; quiz 1650-1. Pubmed