Emergency Briefcase
Emergency Briefcase · Case Mode

Testicular Torsion

A time-critical acute-scrotum case with diagnostic reasoning, TWIST support, detorsion guidance and definitive management.

🚨 TIME IS TESTICLE—CONSULT EARLY
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The Case Begins

Arrival

A 15-year-old awakens with abrupt, severe left scrotal pain and vomits twice. Symptoms began 2 hours ago. The left testis is swollen, firm, high-riding and transversely oriented; the ipsilateral cremasteric reflex is absent. He is afebrile and has no dysuria.

Recognize the pattern

  • Abrupt unilateral pain
  • Nausea or vomiting
  • High-riding/horizontal testis
  • Firm swelling
  • Absent cremasteric reflex

ABEM-style decision 1

What is the most appropriate next step?

Best answer: C. This is a high-probability torsion presentation. Make the patient NPO, provide analgesia, and activate urology/OR immediately. Imaging must not delay exploration when clinical suspicion is high.
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TWIST Score Calculator

0
Select findings
TWIST supports risk stratification; it does not overrule clinical concern.

Interpretation with guardrails

0–2: lower risk; torsion is not impossible if the story remains concerning. 3–4: intermediate risk; urgent Doppler ultrasound and urology involvement. 5–7: high risk; urgent urology/exploration—do not create imaging delay.

ABEM-style decision 2

The patient’s TWIST score is 7. Ultrasound is unavailable for 90 minutes. What should you do?

Best answer: B. A classic high-risk presentation is a surgical emergency. TWIST is supportive, not a mandatory gateway; ultrasound should be reserved for diagnostic uncertainty when it will not delay definitive care.
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Clinical Diagnosis, Selective Imaging

High clinical probability

Urgent surgical exploration is appropriate without ultrasound. A normal urinalysis, pain improvement or atypical age does not safely exclude torsion.

Equivocal presentation

Color and spectral Doppler ultrasound is the initial imaging test. Assess intratesticular flow, spermatic cord/whirlpool sign, testicular position and secondary changes.

Imaging pitfalls

  • Preserved flow can occur with partial or intermittent torsion.
  • Early torsion may lack dramatic secondary changes.
  • Comparison with the contralateral side matters.
  • A technically limited study does not equal a negative study.

Unreliable shortcuts

Prehn’s sign is not sufficiently accurate to rule in epididymitis or rule out torsion. Presence of a cremasteric reflex also does not completely exclude torsion.

ABEM-style decision 3

Doppler ultrasound reports symmetric flow, but the patient describes three prior self-resolving episodes and now has recurrent sudden pain with a horizontal lie. What is the best next step?

Best answer: D. Intermittent torsion can detorse before imaging, producing normal flow. The episodic abrupt pain and abnormal lie remain concerning and require urgent specialist assessment.
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Emergency Management

Activate urology and ORConsult as soon as torsion enters the differential; document symptom onset and calls.
Supportive care in parallelNPO, IV access, analgesia, antiemetic and appropriate preoperative evaluation. Do not let routine testing delay exploration.
Selective DopplerUse rapidly when the diagnosis is equivocal—not as a ritual before consultation in a classic case.
Definitive treatmentScrotal exploration, detorsion and bilateral orchiopexy; orchiectomy only when the affected testis is nonviable.

Salvage is a curve—not a cliff

Pooled outcomes show survival around 97.2% at 0–6 hours, 79.3% at 7–12 hours, 61.3% at 13–18 hours, and 42.5% at 19–24 hours. Explore even with delayed presentation; do not declare futility from time alone.

Time estimator

0–6 hours: highest reported salvage range. Act immediately.
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Manual Detorsion Is a Bridge

Do not delay surgery

Attempt manual detorsion only while operative care is being arranged or when surgery is unavoidably delayed. It does not replace exploration or bilateral fixation.

Technique principles

  • Provide analgesia/sedation when appropriate.
  • Most testes initially rotate outward—“open the book.”
  • Use 180° increments; multiple rotations may be required.
  • If pain worsens or resistance increases, reverse direction.
  • Reassess position, pain and flow when available.

Critical nuance

Direction varies, pain relief may be incomplete, and residual torsion can remain even after apparent success. Continued urgent surgical exploration is mandatory.

ABEM-style decision 4

Manual detorsion produces immediate pain relief and restored Doppler flow. What is the correct disposition?

Best answer: C. Apparent detorsion does not secure the testis and does not reliably exclude residual twist. Urgent exploration and bilateral orchiopexy remain necessary.
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Acute Scrotum Differential

Epididymitis

Often more gradual; dysuria, fever or urinary findings may occur. Neither Prehn’s sign nor urinalysis safely excludes torsion.

Torsed appendix testis

Focal superior-pole tenderness and possible blue-dot sign; systemic symptoms are less prominent.

Incarcerated hernia

Groin/scrotal mass, vomiting, bowel symptoms or inability to reduce. Requires urgent surgical evaluation.

Trauma or hematoma

History of injury, ecchymosis or rupture concern. Significant trauma still requires urgent Doppler/urologic assessment.

Orchitis

Viral prodrome, fever, diffuse testicular tenderness; torsion must be excluded when presentation is acute.

Intermittent torsion

Recurrent abrupt episodes with spontaneous resolution. Imaging between episodes may be normal.

ABEM-style decision 5

Which finding most strongly supports torsion over epididymitis?

Best answer: A. The abrupt onset, autonomic symptoms and abnormal lie are a classic cluster. Prehn’s sign is unreliable; pyuria does not eliminate the possibility of torsion.
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Case Recap

ABEM decisions
0/5 correct

Critical actions

  1. Recognize the time-critical phenotype.
  2. Consult urology early and prepare the OR.
  3. Do not delay a classic case for imaging.
  4. Use ultrasound thoughtfully in equivocal cases.
  5. Use manual detorsion only as a bridge.
  6. Proceed to exploration even after successful detorsion.

Common mistakes → mitigation

  • Overtrusting Prehn’s sign: use the whole presentation.
  • Waiting for ultrasound: bypass it in high-probability cases.
  • Normal flow = no torsion: consider intermittent/partial torsion.
  • Six hours = futile: explore; salvage persists later.
  • Pain relief = complete detorsion: continue to surgery.
Emergency Briefcase · Time-critical urologic emergency