Testicular torsion

1. History

• Onset and character: Sudden, severe, unilateral scrotal/testicular pain — the hallmark symptom. Ask exact time of onset (critical for salvage window) [4-5]
• Associated symptoms: Nausea and vomiting are common and strongly predictive (present in majority of torsion cases) [6-7]
• Abdominal pain: Some patients (especially children) present with abdominal pain only — always ask about testicular pain in boys with abdominal pain [8]
• Prior episodes: Intermittent torsion-detorsion may present as recurrent episodes of self-resolving testicular pain [8]
• Activity/triggers: Antecedent trauma, physical activity, cold weather exposure [1]
• Timing: Symptom duration is the single most important prognostic factor — document precisely [2]
• Important negatives: Absence of dysuria, urethral discharge, fever (these suggest epididymitis instead) [1][9]

2. Alarm Features

• Sudden onset of severe unilateral scrotal pain with nausea/vomiting
• High-riding testicle with transverse lie [1][6]
• Absent cremasteric reflex (OR 47.6 for torsion in one study) [1][7]
• Hard, swollen, exquisitely tender testicle [6][10]
• Symptom duration approaching or exceeding 6 hours — escalate immediately [2][5]
• Any boy with acute abdominal pain and scrotal findings [8]
• Bilateral scrotal pain (rare but catastrophic if bilateral torsion)

3. Medications

• ED pain management: IV/IM ketorolac, opioids (morphine, fentanyl) for analgesia; do not delay surgical consultation for pain control [4]
• Procedural sedation: Consider for manual detorsion if patient cannot tolerate the procedure due to pain [11]
• Spermatic cord block: Lidocaine injection at the external inguinal ring can facilitate manual detorsion [4]
• No role for antibiotics unless epididymitis is the confirmed diagnosis
• Contraindicated: Do not give antibiotics empirically and discharge if torsion has not been excluded

4. Diet

• NPO status: Keep patient NPO once torsion is suspected, as emergent surgical exploration is likely [5]
• No specific dietary triggers or long-term dietary considerations

5. Review of Systems

• GU: Dysuria, urethral discharge, urinary frequency (suggests epididymitis/UTI rather than torsion) [9]
• GI: Nausea, vomiting, abdominal pain (common in torsion; abdominal pain may be the sole complaint in children) [8]
• Constitutional: Fever (more suggestive of infectious etiology — epididymo-orchitis) [9]
• MSK/Derm: Scrotal erythema, edema, warmth
• Heme: Prior history of bleeding disorders (relevant for surgical planning)

6. Collateral History and Family History

• Family history of torsion: A recognized risk factor; the bell-clapper deformity is often bilateral and may be familial [1]
• Prior urological history: Undescended testis, prior orchiopexy, inguinal hernia repair
• Collateral from parents/caregivers: Essential in pediatric patients — exact time of symptom onset, prior similar episodes, and whether the child has been reluctant to report genital pain [8]

7. Risk Factors

• Bell-clapper deformity: The most important anatomical risk factor — excessive testicular mobility due to abnormal anchoring of the tunica vaginalis [1][4]
• Age: Bimodal distribution — peak incidence in neonates (first year of life) and adolescents aged 12–18 years [4-5]
• Family history of testicular torsion [1]
• Cold weather / hyperactive cremasteric reflex [1]
• Antecedent trauma [1][6]
• Prior episodes of intermittent testicular pain (intermittent torsion-detorsion) [8][12]
• Incidence: ~1 in 4,000 males younger than 25 years; 3.8 per 100,000 males <18 years annually [5-6]

8. Differential Diagnosis

• Torsion of the testicular appendage (appendix testis): Gradual onset of superior pole pain, blue dot sign pathognomonic but uncommon, cremasteric reflex preserved, treated conservatively [1][9]
• Epididymitis/epididymo-orchitis: More gradual onset, dysuria, urethral discharge, tender epididymis, positive Prehn sign, increased blood flow on Doppler; in sexually active males think Chlamydia/Gonorrhea, in prepubertal boys think enteric organisms [1][9]
• Incarcerated inguinal hernia: Inguinal swelling extending into scrotum, bowel sounds in scrotum, may have obstructive symptoms [13]
• Testicular trauma/rupture: History of direct trauma, scrotal hematoma
• Idiopathic scrotal edema: Bilateral scrotal wall edema without testicular tenderness, self-limited [13]
• Testicular tumor: Usually painless, firm mass; ~10% present with acute pain from hemorrhage into tumor
• Fournier's gangrene: Rapidly progressive scrotal erythema, crepitus, systemic toxicity — surgical emergency
• Henoch-Schönlein purpura: Scrotal involvement with characteristic purpuric rash

9. Past Medical History

• Prior episodes of testicular pain (intermittent torsion-detorsion) [8]
• Previous orchiopexy or inguinal surgery
• Undescended testis (cryptorchidism)
• Known bell-clapper deformity
• Urogenital anomalies
• Bleeding disorders or anticoagulant use (surgical planning)

10. Physical Exam

• Vital signs: Usually normal; tachycardia from pain; fever suggests infectious etiology
• Inspection: Scrotal erythema, edema, high-riding testicle, transverse lie [1][6]
• Palpation: Exquisitely tender, swollen, hard testicle [6][10]
• Cremasteric reflex: Stroke medial thigh → observe for ipsilateral testicular retraction. Absent reflex is the most sensitive physical finding (100% sensitivity in one series). However, its presence does not reliably exclude torsion [4][7]
• Prehn sign: Elevation of the scrotum — classically relieves pain in epididymitis but not torsion. Low reliability; should not be used to rule out torsion [11]
• Blue dot sign: Bluish discoloration at the superior pole — pathognomonic for torsion of the appendix testis but uncommonly seen [1]
• Inguinal exam: Assess for hernia, cord tenderness
• Abdominal exam: Rule out referred pain sources

11. Lab Studies

• Labs are not required and should not delay surgical consultation or imaging [5]
• Urinalysis: May help differentiate from epididymitis (pyuria, bacteriuria suggest infection); typically normal in torsion
• CBC: Leukocytosis is nonspecific; may be mildly elevated in torsion from stress response
• STI testing: Urine NAAT for Chlamydia/Gonorrhea if epididymitis is suspected in sexually active patients
• Platelet-to-lymphocyte ratio (PLR): Emerging as a predictor of testicular necrosis in some studies, but not yet standard practice [14]

12. Imaging

• First-line: High-resolution color Doppler ultrasonography — sensitivity ~95–100%, specificity ~94–98% for torsion [1][15]
• Key US findings:
  • Decreased or absent intratesticular blood flow compared to contralateral side [13]
  • Whirlpool sign of the spermatic cord — the most specific US sign, pathognomonic in adults [15-16]
  • Enlarged, heterogeneous testis with associated hydrocele [13]
  • Spermatic cord twisting (target-like concentric rings on cross-section) [13]
• Critical caveat: A normal ultrasound does not exclude torsion — preserved blood flow can occur with partial or early torsion. If clinical suspicion is high, proceed to surgical exploration regardless of US findings [4-5][17]
• Do not delay surgery for imaging when clinical suspicion is high (TWIST ≥5) [1][10]
• ACR Appropriateness Criteria (2024): Scrotal US with Doppler is the recommended initial imaging for acute scrotal pain without trauma [16]
• CT/MRI: Not indicated in the acute setting

13. Special Tests

TWIST Score (Testicular Workup for Ischemia and Suspected Torsion): [6][10]

• Score 0–2 (Low risk): ~1–2% torsion rate → US may be sufficient to rule out [6][10]
• Score 3–4 (Intermediate risk): ~22% torsion rate → Obtain urgent Doppler US + urology consult [6]
• Score ≥5 (High risk): ~87% torsion rate → Proceed directly to surgical exploration; do not delay for imaging [6][10]

The TWIST score has been validated when performed by non-urologists including EMTs, with NPV of 100% for low-risk and PPV of 93.5% for high-risk groups. [10] However, it should be used for risk stratification, not as an exclusionary tool, given a non-negligible false-negative rate. [18]

• POCUS by EPs: Sensitivity 96%, specificity 95% when assessing for impaired blood flow or whirlpool sign [18]
• Manual detorsion (see Treatment Plan): Can be performed as a bedside procedure, ideally with US guidance [11][19]

14. ECG

• Not routinely indicated for testicular torsion
• Consider ECG only if procedural sedation is planned for manual detorsion or if the patient has cardiac comorbidities

15. Assessment

Testicular torsion is a time-critical surgical emergency. Key assessment points:

• Severity stratification by symptom duration: [1-2]
  • 0–6 hours: ~97% salvage rate
  • 7–12 hours: ~79% salvage rate
  • 13–24 hours: ~42–54% salvage rate
  • 24 hours: ~18% salvage rate (but still worth pursuing surgery)
• Atypical presentations to recognize: Isolated abdominal pain in children, intermittent torsion-detorsion with spontaneous resolution, neonatal torsion (painless scrotal mass with discoloration) [4][8]
• Complications: Testicular necrosis requiring orchiectomy (42% overall orchiectomy rate), testicular atrophy even after successful detorsion (significant risk beyond 6 hours), decreased fertility, contralateral testicular damage from immune-mediated mechanisms [5][20]
• Long-term follow-up shows testicular atrophy risk is higher than previously reported, with heterogeneous echotexture on US even in salvaged testes raising concerns about fertility impact [20]

16. Treatment Plan

Initial stabilization:

• IV access, analgesia (ketorolac 0.5 mg/kg IV, opioids as needed), NPO status
• Immediate urology consultation — do not delay for imaging if clinical suspicion is high [4-5]

Manual detorsion in the ED:

• Indicated as a temporizing measure while awaiting surgery — not definitive treatment [1][4][19]
• Classic technique: "Open the book" — rotate the affected testicle medially to laterally (toward the thigh). Most torsion occurs inward, so outward rotation detorses [11]
• Success indicators: Immediate pain relief, testicle descends to normal position, restoration of blood flow on Doppler [19][21]
• US-guided detorsion improves success rates and confirms reperfusion in real time [11][19]
• Success rate: ~26–80% depending on series; most effective when presentation delay is <6 hours and scrotal edema is absent [3][21-22]
• Successful manual detorsion was independently associated with improved surgical salvage (OR 17.38) and reduced orchiectomy from 24.6% to 2.8% [23]
• Manual detorsion is NOT definitive — all patients still require surgical orchiopexy [1][19]

Definitive surgical management:

• Emergent scrotal exploration with surgical detorsion and bilateral orchiopexy (fixation of both testes to prevent future torsion) [1][5][8]
• If the testicle is nonviable → orchiectomy with contralateral orchiopexy [5]
• After successful manual detorsion, orchiopexy can be performed semi-electively (within 1–14 days) with no increased risk of re-torsion or orchiectomy [3][21]

Aggressive management even with prolonged symptoms:

• Pediatric Emergency Care[2]

17. Disposition

• Admission/OR: All confirmed or high-suspicion torsion cases require emergent surgical exploration [5]
• Transfer: If urology is not available on-site, arrange emergent transfer — inter-facility transfer significantly reduces salvage rates, so attempt manual detorsion before/during transfer [24]
• Observation: Not appropriate for suspected torsion. Intermediate-risk TWIST scores warrant urgent imaging and urology consultation, not observation alone [6]
• Discharge: Only if torsion has been definitively excluded (e.g., confirmed alternative diagnosis on US with low TWIST score). Ensure clear return precautions [4]
• Urology consultation triggers: Any concern for torsion — consult before imaging in high-risk cases [1]

18. Follow Up / Return Precautions

• Post-orchiopexy follow-up: Urology follow-up within 1–2 weeks; long-term US monitoring for testicular atrophy recommended [20]
• Long-term surveillance: Testicular atrophy can develop months to years after salvage, even when initial surgery appeared successful — serial US monitoring of testicular volume is warranted [20]
• Fertility counseling: Discuss potential impact on fertility, especially with delayed presentation or orchiectomy; semen analysis may be considered in post-pubertal patients at appropriate follow-up [5][20]

Return precautions (counsel patient/family):

• Return immediately for any recurrence of sudden testicular pain, swelling, or nausea/vomiting
• Educate adolescents and parents that testicular pain is always an emergency and should never be ignored or "waited out" [8]
• Contralateral torsion can occur even after bilateral orchiopexy (rare)
• Expected recovery: Scrotal swelling and discomfort typically resolve over 1–2 weeks post-surgery