Acute scrotal pain in an adolescent — suspected testicular torsion
ACR AC Acute Onset of Scrotal Pain (2024 rev)Scrotal ultrasound with colour Doppler is the imaging test, performed immediately or not at all: where clinical suspicion is high the patient goes to theatre, because testicular salvage falls sharply with time and a scan that delays exploration causes the harm it was meant to prevent.
Sudden severe unilateral scrotal pain, often with nausea, vomiting and abdominal pain, typically in an adolescent — sometimes presenting as abdominal pain with the scrotum unexamined.
Referenced decision support — confirm against your local protocol.
Decision support, not a directive. Protocols and timings shown are typical published ones — your local protocol takes precedence, and the vetting radiologist decides.
Accept as requested
Scrotal ultrasound with colour Doppler
Ultrasound scrotum with Doppler
What we'd amend, and why
- Colour Doppler ultrasound compares the two testes in the same window, which is what makes asymmetric or absent intratesticular flow interpretable, and grey-scale imaging adds the twisted spermatic cord — the whirlpool sign — along with testicular size, echotexture and the alternative diagnoses. It is immediate, needs no radiation or contrast, and is well tolerated by an adolescent in severe pain. It is accepted on one condition, which is the whole vetting decision here: imaging must never delay exploration. Torsion is a clinical diagnosis, salvage falls steeply with the hours, and where clinical suspicion is high the patient goes to theatre — the scan follows him there or is skipped, and it is never the reason he waits. Preserved intratesticular flow does not exclude incomplete or intermittent torsion, so a normal scan does not overrule a convincing examination either.
Nothing needs resolving before this goes ahead. Routine checks below are owned downstream.
How was this decided?
- pathwayany — All patients
Decision support only. Local protocol takes precedence.
Worth asking the referrer (1)
None of these hold the request up. They sharpen the protocol or the plan that follows.
- When did the pain start, and what did examination of the scrotum show?Time from onset drives salvage, and a high clinical probability means the patient should be in theatre rather than in the scan room.
Pathways
Big forks are separate pathways; the first whose conditions match is the one used.
Within the salvage window — onset under about six hours
| Role | Study & protocol | Why this answers the question |
|---|---|---|
| First line | Ultrasound scrotum with Doppler Scrotal ultrasound with colour Doppler usually appropriate | Inside the window this scan happens now or it does not happen. Irreversible ischaemic damage is described with delays as short as around six hours from onset, so the salvage curve is falling while the request is being vetted — colour Doppler ultrasound comparing both testes in the same window, with grey-scale assessment of the cord for the whirlpool sign, is the right examination, but only if it can be performed immediately. Where clinical suspicion is high the patient goes to theatre and the scan follows him or is skipped; booking a slot is the failure mode this card exists to prevent. A preserved intratesticular flow inside this window does not exclude incomplete or intermittent torsion, and a convincing history warrants exploration regardless of the scan. |
- The time from onset is the referrer’s estimate and is often wrong in the direction that reassures. It sharpens the urgency; it never licenses waiting.
- An onset beyond the window is not a reason to downgrade the request. Salvage rates fall but exploration is still the surgical decision, and the ultrasound still identifies the alternatives.
All patients
Matches your inputsDefault| Role | Study & protocol | Why this answers the question |
|---|---|---|
| First line | Ultrasound scrotum with Doppler Scrotal ultrasound with colour Doppler usually appropriate | Colour Doppler ultrasound compares the two testes in the same window, which is what makes asymmetric or absent intratesticular flow interpretable, and grey-scale imaging adds the twisted spermatic cord — the whirlpool sign — along with testicular size, echotexture and the alternative diagnoses. It is immediate, needs no radiation or contrast, and is well tolerated by an adolescent in severe pain. It is accepted on one condition, which is the whole vetting decision here: imaging must never delay exploration. Torsion is a clinical diagnosis, salvage falls steeply with the hours, and where clinical suspicion is high the patient goes to theatre — the scan follows him there or is skipped, and it is never the reason he waits. Preserved intratesticular flow does not exclude incomplete or intermittent torsion, so a normal scan does not overrule a convincing examination either. |
- Where clinical suspicion is high, surgical exploration takes precedence over imaging. The correct radiological response to that request is to say so, quickly, rather than to book a slot.
Pitfalls
- Reporting preserved intratesticular flow as excluding torsion. Incomplete and intermittent torsion commonly retain flow, and a convincing history warrants exploration regardless of the scan.
- Scanning one side only, which removes the comparison that makes flow findings meaningful.
- Letting the scan become the reason the patient waits. Where suspicion is high, imaging follows the patient to theatre or is skipped.
- Accepting a CT abdomen for an adolescent boy with lower abdominal pain without asking whether the scrotum has been examined.
- Diagnosing epididymo-orchitis in a pre-pubertal or adolescent boy without a compelling reason; it is uncommon in this group and is a frequent label on a torted testis.
Priors — what to pull first
- Previous episodes of self-resolving severe scrotal pain suggest intermittent torsion and change the surgical conversation, even if today’s scan is normal.
- A previous ultrasound documenting testicular volumes gives a baseline for asymmetry.
What makes a good request
- Torsion is a clinical diagnosis. Imaging helps the intermediate-probability patient and identifies alternatives such as epididymo-orchitis or a torted appendix testis; it does not overrule a convincing examination.
- Delay matters in hours, not days: irreversible ischaemic damage is described with delays as short as around six hours from onset.
- Any adolescent boy with abdominal pain should have the scrotum examined. Torsion presenting as abdominal pain is a recurring source of missed diagnosis and of misdirected CT requests.
Scoring this once it is done
The classification and risk tools this question ends in.
How these studies are acquired
Contrast, phases and timing for every study on the pathways above.
Confirm locally
- Timings, contrast volumes and rates above are typical published values. Your department's protocol, scanner and patient population decide the actual numbers.
- Safety thresholds and premedication policy follow local policy where it differs from the cited guidance.
References
- ACR Appropriateness Criteria — Acute Onset of Scrotal Pain, Without Trauma, Without Antecedent Mass: 2024 Update · ACR Appropriateness Criteria
- Diagnostic accuracy of ultrasound in the acute scrotum in urgent clinical settings · Primary literature
- ACR Appropriateness Criteria — Acute onset of scrotal pain narrative · ACR Appropriateness Criteria
Implemented from the cited published sources. Educational and workflow support only; confirm against current guidelines and local policy before clinical use.