Paeds · nephrology-urology-fluids-and-electrolytes
Scrotal pain and testicular torsion
Also known as Acute scrotum · Testicular torsion · Torsion of the spermatic cord · Torsion of the appendix testis · Acute epididymitis
Fellowship guide to scrotal pain and testicular torsion in boys. Covers the bell-clapper deformity and intravaginal torsion, the 6-hour salvage window, the TWIST score for the acute scrotum, the differentiation of torsion from torsion of the appendix testis and acute epididymitis, the role of colour Doppler ultrasound, immediate surgical exploration with detorsion and bilateral orchidopexy, manual detorsion as a bridge, the extravaginal perinatal form, intermittent torsion, and the fertility and medicolegal consequences of a missed diagnosis.
On this page
Study tools
Your progress
Saved on this device.
Practise this topic
Target exams
Red flags
- Sudden severe unilateral scrotal pain in a boy aged 12 to 18 years is torsion until proven otherwise
- The 6-hour rule: do not delay surgical exploration for imaging when clinical suspicion is high
- An absent cremasteric reflex on the painful side is the single most sensitive sign of torsion
- A high-riding testis lying horizontally, with nausea and vomiting, makes torsion the working diagnosis
- Pain that spontaneously and repeatedly resolves is intermittent torsion, not growing pains, and needs elective orchidopexy
- A newborn with a hard, fixed, painless discoloured scrotal mass has perinatal extravaginal torsion
- Normal colour Doppler flow does not exclude early or incomplete torsion in a convincing clinical picture
Life stages
Care settings
Clinical exam formats
Board mappings
- Recognises acute testicular torsion as a time-critical surgical emergency and that sudden severe scrotal pain in a boy is torsion until proven otherwise
- States the 6-hour salvage window and that high clinical suspicion mandates immediate surgical exploration without waiting for imaging
- Identifies the absent cremasteric reflex, the high-riding horizontal testis, and nausea and vomiting as the cardinal features of torsion
- Differentiates intravaginal torsion with its bell-clapper substrate from the perinatal extravaginal form and from intermittent torsion, and applies the TWIST score to stratify the acute scrotum
- Justifies surgical exploration as the diagnostic and therapeutic standard for high-probability torsion, describes detorsion, viability assessment and bilateral orchidopexy, and positions manual detorsion and colour Doppler ultrasound as adjuncts only
- Counsels the adolescent and family on the fertility and medicolegal consequences of torsion and the rationale for contralateral fixation
- Bell-clapper deformity and the pathophysiology of venous then arterial occlusion underlying the steep salvage curve
- TWIST score components and risk categories and the role of colour Doppler ultrasound in the equivocal acute scrotum
- Differential of the acute scrotum distinguishing torsion from torsion of the appendix testis and acute epididymitis
- Assesses a boy with acute scrotal pain, applies the TWIST score, and constructs the immediate surgical and communication plan
- Counsels a family on the operation, the risk of orchidectomy, and the long-term fertility surveillance
- Recognises intermittent torsion and perinatal torsion and selects elective orchidopexy or urgent referral appropriately
- Level 1: Recognition of sudden severe scrotal pain as possible torsion and the 6-hour window
- Level 2: Application of the TWIST score and arrangement of urgent surgical exploration without imaging delay for high-probability torsion
- Level 3: Coordination of surgical management, bilateral orchidopexy, and follow-up fertility and psychosocial support
- Bell-clapper deformity, intravaginal versus extravaginal torsion, and the pathophysiology of testicular ischaemia
- TWIST score and the differentiation of torsion from torsion of the appendix testis and epididymitis
- Surgical management, salvage rates by duration, and the consequences of delayed orchiectomy
- Focused examination of the acute scrotum including cremasteric reflex, lie, and the blue dot sign
- Interpretation of colour Doppler ultrasound in the context of the clinical probability
- Structured explanation to the family of the operation and the long-term outlook
- Testicular torsion as a surgical emergency with a bimodal age distribution and the 6-hour salvage window
- TWIST score and the role of colour Doppler ultrasound in the equivocal presentation
- Surgical exploration with detorsion, viability assessment, and bilateral orchidopexy
- Recognition of acute testicular torsion and immediate referral for surgical exploration
- Differentiation of torsion from epididymitis and torsion of the appendix testis
- Family communication around the operation, orchidectomy risk, and fertility follow-up
- Canadian approach to the acute scrotum in children with standardised risk stratification
- Role of colour Doppler ultrasound and the threshold for surgical exploration
- Long-term fertility surveillance and transition after torsion or orchidectomy
Overview & Definition
A boy who wakes in the night with sudden severe testicular pain has torsion until you have proved otherwise. Testicular torsion is the twisting of the spermatic cord on its long axis, which strangles the testicular blood supply and kills the testis within hours. It is the can't-miss diagnosis in any male with acute scrotal pain, because a missed torsion is a lost testis and a preventable medicolegal disaster. [1]
The cord carries the artery that feeds the testis and the veins that drain it. A twist compresses the thin-walled veins first, so the testis swells and congests, and then it collapses the artery, so the swollen organ becomes ischaemic. The whole process is governed by time. The salvageable window is short, and the testis that is not untwisted within hours becomes necrotic and has to be removed. [1]
Three facts make this topic central to the paediatric exam. The diagnosis is clinical, and a convincing picture goes straight to theatre without waiting for a scan. The determinant of outcome is the duration of torsion, which is why the 6-hour rule governs every decision. And the differential of the acute scrotum is narrow but high-stakes, because torsion sits beside the benign torsion of the appendix testis and the treatable acute epididymitis, and the only safe way to tell them apart at the bedside is a structured, time-critical assessment. Sharp and colleagues set out these principles in their widely cited review. [1]
References12ShowHide
- [1]Sharp VJ, Kieran K, Arlen AM Testicular torsion: diagnosis, evaluation, and management. Am Fam Physician, 2013.PMID 24364548
- [2]Laher A, Ragavan S, Mehta P, et al Testicular Torsion in the Emergency Room: A Review of Detection and Management Strategies. Open Access Emerg Med, 2020.PMID 33116959
- [3]McLaren PSM A systematic review on the utility of ultrasonography in the diagnosis of testicular torsion in acute scrotum patients. Radiography (Lond), 2021.PMID 33451883
- [4]Ramachandra P, Palazzi KL, Holmes NM, et al Factors influencing rate of testicular salvage in acute testicular torsion at a tertiary pediatric center. West J Emerg Med, 2015.PMID 25671040
- [5]Qin KR, Qu LG Diagnosing with a TWIST: Systematic Review and Meta-Analysis of a Testicular Torsion Risk Score. J Urol, 2022.PMID 35238603
- [6]Barbosa JABA, de Freitas PFS, Carvalho SAD, et al Validation of the TWIST score for testicular torsion in adults. Int Urol Nephrol, 2021.PMID 32844355
- [7]Aggarwal D, Parmar K, Sharma AP, et al Long-term impact of testicular torsion and its salvage on semen parameters and gonadal function. Indian J Urol, 2022.PMID 35400863
- [8]Davis JE, Silverman M Scrotal emergencies. Emerg Med Clin North Am, 2011.PMID 21782069
- [9]Manohar CS, Gupta A, Keshavamurthy R, et al Evaluation of Testicular Workup for Ischemia and Suspected Torsion score in patients presenting with acute scrotum. Urol Ann, 2018.PMID 29416270
- [10]Gerena M, Allen BC, Turkbey B, et al. ACR Appropriateness Criteria Acute Onset of Scrotal Pain-Without Trauma, Without Antecedent Mass: 2024 Update. J Am Coll Radiol, 2024.PMID 39488348
- [11]Mansbach JM, Forbes P, Peters C Testicular torsion and risk factors for orchiectomy. Arch Pediatr Adolesc Med, 2005.PMID 16330742
- [12]Erlich T, Ghazzaoui AE, Pokarowski M, et al Perinatal testicular torsion: The clear cut, the controversial, and the "quiet" scenarios. J Pediatr Surg, 2022.PMID 34753560