What factors increases the risk of ovarian torsion?

Updated: Jun 27, 2017
  • Author: Erik D Schraga, MD; Chief Editor: Eugene C Lin, MD  more...
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Congenitally malformed and elongated fallopian tubes may be seen, particularly in young, prepubertal patients.

Ovarian tumors, both benign and malignant, are implicated in 50-60% of cases of torsion. Involved masses are nearly all larger than 4-6 cm, although torsion is still possible with smaller masses. Dermoid tumors are most common. Malignant tumors are much less likely to result in torsion than benign tumors are. This is because of the presence of cancerous adhesions that fix the ovary to surrounding tissues.

Conversely, patients with a history of pelvic surgery (principally tubal ligation) are at increased risk for torsion, probably because of adhesions that provide a site around which the ovarian pedicle may twist.

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