USMLE Prep - Medical Reference Library

Ovarian Torsion — Clinical Suspicion, Ultrasound, and Laparoscopic Detorsion

System: Obstetrics Gynecology • Reviewed: Sep 1, 2025 • Step 1Step 2Step 3

Synopsis:

Sudden unilateral pelvic pain with nausea/vomiting in reproductive‑age or pregnant patients suggests torsion. Obtain transvaginal ultrasound with Doppler, but do not delay gynecologic consultation; prioritize ovary‑sparing laparoscopic detorsion when viable.

Key Points

  • Use the highest‑yield diagnostic test early; do not let testing delay time‑critical therapy.
  • Set objective targets (hemodynamic, neurologic, respiratory) and reassess frequently.
  • Plan definitive source control or reperfusion when indicated; document follow‑up and patient education.

Algorithm

  1. Strong clinical suspicion based on history/exam → NPO and urgent Gyn consult.
  2. Obtain transvaginal ultrasound with Doppler; do not exclude torsion solely on Doppler.
  3. Prioritize timely laparoscopy with ovary‑sparing detorsion when viable; cystectomy if indicated.
  4. If non‑viable: salpingo‑oophorectomy after counseling; consider fertility implications.
  5. Address underlying risk factors (ovarian cysts, pregnancy); plan follow‑up and recurrence counseling.

Clinical Synopsis & Reasoning

Sudden unilateral pelvic pain with nausea/vomiting in reproductive‑age or pregnant patients suggests torsion. Obtain transvaginal ultrasound with Doppler, but do not delay gynecologic consultation; prioritize ovary‑sparing laparoscopic detorsion when viable.


Treatment Strategy & Disposition

Stabilize ABCs. Initiate guideline‑concordant first‑line therapy with precise dosing and continuous monitoring. Escalate to advanced/procedural interventions based on explicit failure criteria. Define ICU, step‑down, and ward disposition triggers; involve specialty teams early.


Epidemiology / Risk Factors

  • Risk varies by comorbidity and precipitants; see citations for condition‑specific data.

Investigations

TestRole / RationaleTypical FindingsNotes
Transvaginal ultrasound with DopplerImaging of choiceEnlarged ovary, peripheral follicles, absent/reduced flowNormal Doppler does not exclude torsion
Pregnancy testEtiologic/management implicationsPositive in pregnancyGuide surgical planning
CBC/BMPPre‑op assessmentOften normalRule out differentials

Pharmacology

Medication/InterventionMechanismOnsetRole in TherapyLimitations
Analgesia (opioid‑sparing)MultimodalImmediatePain control pre‑opAvoid delay of OR
Antiemetics (ondansetron)5‑HT3 antagonistMinutesSymptom controlQT considerations
Antibiotics (if necrosis suspected)Broad‑spectrumHoursProphylaxis if ischemic tissue/necrosisPer OR findings

Prognosis / Complications

  • Outcome depends on timeliness of diagnosis and definitive therapy; monitor for complications.

Patient Education / Counseling

  • Provide red‑flag education, adherence guidance, and explicit return precautions; arrange timely specialty follow‑up.

References

  1. ACOG Committee Opinion No. 783: Adnexal Torsion in Adolescents (2019) — Link
  2. Obstet Gynecol full text (2019) — Link