Emergency Briefcase

Ovarian Torsion

Recognize the time-sensitive pattern, interpret ultrasound without false reassurance, and move rapidly toward definitive gynecologic evaluation.

Emergency alert: torsion is a surgical diagnosis. Strong clinical suspicion warrants urgent gynecology consultation even when Doppler flow is present.
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The Case Begins

Sudden unilateral pelvic pain

A 27-year-old woman presents with abrupt right lower-quadrant pain that began two hours ago. The pain is severe and intermittent, with three episodes of vomiting. She has a known 6-cm right ovarian cyst. HR 108, BP 122/74, temperature 37.1°C. Pregnancy test is negative.

First priorities

  • Analgesia and antiemetic therapy
  • Pregnancy testing
  • Focused abdominal and pelvic assessment
  • Early pelvic ultrasound and gynecology contact
  • Keep NPO; establish IV access

Decision 1

Which action is most appropriate now?

Best answer: C. Sudden unilateral pain, vomiting, and an adnexal mass create a high-risk torsion pattern. Symptom improvement can reflect intermittent torsion and does not make discharge safe.
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Recognize the Pattern

SuddenOften abrupt onset
UnilateralLower abdominal or pelvic pain
N/VCommon accompanying clue

Risk factors

  • Adnexal mass, especially ≥5 cm
  • Pregnancy
  • Ovulation induction or enlarged ovaries
  • Prior torsion
  • Long utero-ovarian ligament or increased adnexal mobility
  • Pediatric/adolescent patients may torsion a normal ovary

Clinical presentation

  • Sudden severe unilateral pain
  • Intermittent or waxing-and-waning pain
  • Nausea and vomiting
  • Adnexal or lower abdominal tenderness
  • Fever and peritoneal signs may be late findings

Do not wait for a classic presentation

No single history, examination, laboratory result, or imaging feature reliably confirms or excludes torsion. Maintain suspicion when the clinical pattern fits.

Decision 2

Which feature most strengthens concern for torsion?

Best answer: B. The combination is highly concerning. Torsion can still occur without a mass, especially in adolescents.
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Diagnostic Approach

Ultrasound findings that support torsion

Ovarian enlargement, stromal edema, and peripherally displaced follicles are common morphologic clues.
A twisted vascular pedicle is a specific finding when visualized.
Decreased or absent flow supports torsion, but preserved flow does not exclude it because of dual blood supply and intermittent or partial torsion.
Free fluid, an adnexal mass, abnormal ovarian position, and tenderness with probe pressure may add support but are not independently diagnostic.

Laboratory testing

Use pregnancy testing and targeted labs to evaluate alternatives and perioperative needs. Leukocytosis is nonspecific and may be absent.

CT or MRI

These may reveal torsion or alternative diagnoses when obtained for undifferentiated pain, but they should not delay consultation or surgery when suspicion is high.

Decision 3

Ultrasound shows an enlarged right ovary with peripheral follicles. Arterial Doppler flow is present. Pain remains severe. What is the best interpretation?

Best answer: D. Preserved Doppler flow cannot rule out torsion. Morphology and the clinical picture matter, and definitive diagnosis is surgical.
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Critical Actions

Stabilize and treat symptomsIV access, analgesia, antiemetic therapy, NPO status, and resuscitation when needed.
Consult gynecology earlyDo not wait for every test to result when the pretest probability is high.
Use ultrasound as supportive evidenceEvaluate ovarian morphology, size, position, Doppler flow, vascular pedicle, adnexal mass, and free fluid.
Proceed to definitive evaluationDiagnostic laparoscopy with detorsion and ovarian preservation is preferred when feasible.

Organ-preserving approach

A dark or ischemic-appearing ovary does not necessarily indicate nonviability. Detorsion and preservation are generally favored unless removal is unavoidable.

Avoid false precision

There is no universally reliable hour cutoff that guarantees viability or predicts irreversible loss. Treat suspected torsion as time-sensitive and avoid preventable delays.

Decision 4

Clinical suspicion remains high despite an equivocal ultrasound. What is the best next step?

Best answer: A. Imaging is not definitive. High suspicion requires urgent specialist and operative assessment.
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Differential and Pitfalls

Common mistakeWhy it failsMitigation
Normal flow = no torsionDual blood supply and intermittent/partial torsion can preserve flow.Integrate morphology, symptoms, risk factors, and specialist assessment.
Waiting for fever or leukocytosisBoth may be absent or late.Act on the clinical syndrome.
Discharging after pain resolvesIntermittent torsion can temporarily detorse.Take the preceding severe episodic pattern seriously.
Delaying consultation for CT/MRIAdditional imaging may consume critical time.Consult early when suspicion is meaningful.
Assuming necrosis from appearanceGross color does not reliably predict recovery.Favor detorsion and preservation when feasible.

Key alternatives

  • Ectopic pregnancy
  • Ruptured or hemorrhagic ovarian cyst
  • Appendicitis
  • Pelvic inflammatory disease / tubo-ovarian abscess
  • Ureterolithiasis
  • Degenerating fibroid
  • Endometriosis

Decision 5

Pain abruptly resolves while awaiting consultation. What is most appropriate?

Best answer: C. Spontaneous detorsion can cause transient symptom resolution. The preceding high-risk history still matters.
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Case Recap

0/5Complete the five decisions to generate your result.

Take-home points

  1. Think torsion with sudden unilateral pain plus nausea or vomiting.
  2. Pregnancy testing and ultrasound are early steps, not definitive exclusion tools.
  3. Normal Doppler flow does not rule out torsion.
  4. Consult gynecology early when suspicion is high.
  5. Definitive diagnosis is surgical; preserve the adnexa when feasible.
Emergency Briefcase · Ovarian Torsion Interactive Learning Module