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What is the most consistant ultrasound finding in an ovarian torsion?

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Answer: Unilateral ovarian enlargement (>4cm). Up to 73% of these has a complex adnexal or pelvoabdominal mass, which can be predominantly cystic, solid, or both.
Albayram F, Hamper UM. Ovarian and adnexal torsion: spectrum of sonographic findings with pathologic correlation. J Ultrasound Med 2001; 20(10):1083–1089.