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Enlarged right ovary with complex (hemorrhagic cyst) and absence of color and spectral Doppler flow. Also shown is the normal Left ovary.
Ovarian torsion is the partial or complete rotation of the adnexa a on its vascular pedicle. It involves the right adnexa a more often (66% of the time). Venous blood 
is the first to be affected followed by arterial flow.
The torsion is often secondary to a cyst or mass. Patients usually present with unilateral pelvic pain, nausea and vomiting are also common
Ultrasound usually shows an enlarged ovary with peripherally displaced follicles, free fluid is often present, no Doppler flow is also often seen (early torsion can still have arterial flow, with venous and lymphatic drainage absent, also the ovary may spontaneously detorse).
Also the ovary has dual arterial supply right ovarian artery and a branch from the uterine artery respectively!
