Knowledge · Acute surgical conditions

The Acute Scrotum: Torsion until Proven Otherwise

By Dr Alexander Young with the Core Surgery Interview Team · Reviewed 11 September 2026

In brief

Acute severe testicular pain is torsion until proven otherwise and goes to theatre on clinical suspicion. According to BAUS, salvage is 90 to 100% under 6 hours, around 50% at 12 hours and under 10% beyond 24 hours, and imaging must not delay surgery.

The acute scrotum is sudden testicular pain, and at the CST management and clinical station the answer is that it is torsion until proven otherwise, which means an immediate senior call and scrotal exploration without waiting for imaging. According to the British Association of Urological Surgeons, salvage is 90 to 100% when surgery happens within 6 hours, around 50% at 12 hours and under 10% after 24 hours. The number that decides the outcome is the time from pain to theatre, and the SHO controls most of it.

Key takeaways

BAUS states that acute severe testicular pain should be assumed to be torsion until proven otherwise, and that clinical suspicion alone mandates exploration
BAUS salvage figures: under 6 hours 90 to 100%, at 12 hours around 50%, beyond 24 hours under 10%
Imaging should not delay surgery; do not delay exploration for an ultrasound when suspicion is high
Torsion has bimodal peaks, in the neonatal period and at puberty between 12 and 18 years, but can occur at any age
At exploration a viable testis is untwisted and both testes are fixed; a non-viable testis is removed
The BURST-BAUS consensus says consent must include the possibility of orchidectomy, and that non-absorbable sutures and three-point fixation are preferred

How do I assess a patient with an acute scrotum?

Assess an acute scrotum with a short, focused CCrISP sequence: immediate management is analgesia and nil by mouth, the full assessment is a history and examination that takes minutes, and the plan is theatre.

Ask when the pain started to the minute, whether it was sudden, whether there has been vomiting, previous similar episodes that settled, and any trauma or urinary symptoms. The time of onset is the single most important fact in the history.

Examine for a high-riding, transversely lying, exquisitely tender testis with an absent cremasteric reflex, and compare it with the other side. Then stop examining and start the phone call.

What else causes an acute scrotum, and does it change the plan?

The other causes of an acute scrotum are torsion of a testicular appendage, epididymo-orchitis, an incarcerated inguinal hernia, trauma and a tumour, and none of them changes the plan when torsion cannot be excluded.

A blue dot at the upper pole and a tender appendage suggest appendage torsion, and dysuria with a gradual onset in a sexually active adult suggests epididymo-orchitis. That said, the overlap is wide, and a wrong guess costs a testis.

BAUS's own trainee guidance says torsion is classically in pubertal boys aged 12 to 18, but with a neonatal peak too, and it can occur at any age. Do not let age reassure you.

Should I request an ultrasound before theatre?

No: BAUS says imaging should not delay surgery and that surgery should not be delayed for imaging when clinical suspicion is high, so a Doppler ultrasound is only for the low-suspicion patient where the surgeon requests it.

The reason is the salvage curve. An ultrasound that takes two hours to arrange moves the patient from the 90 to 100% band towards the 50% band, and a normal Doppler does not exclude intermittent torsion.

What is the management of suspected testicular torsion?

The management of suspected testicular torsion is emergency scrotal exploration: analgesia, nil by mouth, consent, and theatre as soon as the urologist or surgeon and anaesthetist can be there.

At exploration the testis is untwisted and assessed. BAUS describes bilateral orchidopexy if it is viable, or orchidectomy if it is non-viable, and the BURST-BAUS consensus confirms that all panellists would perform bilateral orchidopexy in confirmed torsion.

For fixation, the consensus prefers non-absorbable sutures and three-point fixation. The other side is fixed because the anatomical predisposition, the bell-clapper deformity, is usually bilateral.

Consent for scrotal exploration must include the possibility of orchidectomy, the fixation of both testes, and the fact that the diagnosis may turn out to be something else, all of which the BURST-BAUS consensus lists for the consent process.

The consensus also asks that the risk of subsequent infection or atrophy of the affected testis is discussed, and that where a testis is removed, a prosthesis is raised as a later option. Say that you would consent with a senior present if the patient is a child, and involve the parents.

Under the GMC's Good Medical Practice 2024 the discussion is about what matters to the patient, so fertility, appearance and the reason for fixing the other side are said in plain words.

Who do I escalate an acute scrotum to, and how fast?

Escalate an acute scrotum to the on-call urology or general surgical registrar immediately, by telephone, with the time of onset in your first sentence, and to the anaesthetist and theatre coordinator in the same call chain.

BAUS describes this as time-critical and mandates immediate senior notification, with exploration if torsion cannot be confidently excluded. If the registrar is scrubbed, go to the consultant; the salvage window does not wait for the end of a case.

What is the interviewer listening for in an acute scrotum scenario?

The interviewer is listening for torsion said as the working diagnosis, the time of onset asked and recorded, no ultrasound, an immediate senior call, and a consent conversation that names orchidectomy and bilateral fixation.

The three salvage figures attributed to BAUS and used to justify the pace
Recognition that a settled episode last week is intermittent torsion, not reassurance
Awareness that a neonate or an adult can still tort
Handling of a parent who wants a scan first, with honesty about what the delay costs
Clear documentation of times: onset, arrival, senior contacted, knife to skin

How this comes up at the CST interview

The acute scrotum is set as a 15-year-old with four hours of pain and vomiting, whose parent asks whether an ultrasound would be safer, and the panel wants the honest answer that a scan costs testis-time.

Follow-ups ask what you would say if the registrar is scrubbed, how you consent a minor, and what you tell the family when the testis is found to be non-viable.

The coresurgeryinterview bank has a scored acute scrotum scenario with AI-marked spoken practice: /Question-Bank/Sample-Questions.

Key evidence

Testicular torsion (trainee resource) — British Association of Urological Surgeons (2026)
A BURST-BAUS consensus document for best practice in the conduct of scrotal exploration for suspected testicular torsion: the Finding Consensus for Orchidopexy in Torsion (FIX-IT) study — BJU International (2022)
Good medical practice — General Medical Council (2024)

FAQ

How long can a torted testis survive?

According to BAUS, salvage is 90 to 100% when surgery happens within 6 hours of onset, around 50% at 12 hours, and under 10% after 24 hours. The clock starts with the pain, not with arrival at hospital.

Should I get a Doppler ultrasound to confirm torsion?

Not when suspicion is high. BAUS says imaging should not delay surgery, and clinical suspicion alone mandates exploration. Ultrasound is reserved for low-suspicion cases at the surgeon's request.

Why is the other testis fixed?

Because the bell-clapper deformity that allows torsion is usually bilateral. BAUS describes bilateral orchidopexy for a viable testis, and the BURST-BAUS consensus reports that all panellists would fix both sides in confirmed torsion.

What must the consent form include?

The BURST-BAUS consensus lists the possibility of orchidectomy, fixation of both testes, later infection or atrophy of the affected testis, and the chance that another diagnosis is found. Discuss prosthesis as a later option if the testis is removed.

Which sutures and technique are used for fixation?

The BURST-BAUS consensus prefers non-absorbable sutures and three-point fixation of each testis, performed by any appropriately trained surgeon so that transfer does not delay exploration.

At what ages does torsion occur?

BAUS describes bimodal peaks, in the neonatal period (extravaginal) and at puberty between 12 and 18 years (intravaginal), and states that torsion can occur at any age.

The Core Surgery Interview Team

Written and maintained by doctors who have sat and scored well at this interview, and reviewed against the current published guideline in each case. Guidance changes — check the source before you rely on a threshold.

Last reviewed 11 September 2026

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Practise this at interview level

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