Testicular torsion
A young man, sudden scrotal pain, and a clock that started before he reached you. Why the OR is the investigation and Doppler is the tiebreaker, never the verdict.
The one-liner
High clinical suspicion of torsion goes to the OR — no imaging. Salvage is >90% under 6 hours and under 10% by 24. The cost of a negative exploration is benign; the cost of waiting is a dead testis.
The acute scrotum is one of the first things you’ll be paged about overnight, and the whole skill is acting on a fear before a scan can confirm it. The mistake is almost never the unnecessary exploration. It’s the necessary one that happened too late.
The clock
Torsion is a vascular emergency — the cord twists inside the tunica vaginalis, the testis loses its supply, and salvage is a hard ceiling set by ischemic time:
- >90% salvage if you’re operating inside 6 hours
- ~50% by 12 hours
- <10% by 24 hours
That single curve reorganizes everything else. The collateral supply — testicular, deferential, and cremasteric arteries — is real but cannot outrun a complete twist. So the question for every acute scrotum is one question with a clock attached: is this torsion until proven otherwise?
What the exam is telling you
The findings that make a clinical diagnosis — no imaging required:
- Sudden, severe, unilateral pain — often nocturnal, often waking the patient.
- Nausea and vomiting alongside it (vagal).
- A high-riding, transverse testis with a tender cord.
- Absent cremasteric reflex and a negative Prehn’s sign — elevation does not relieve.
What everyone gets wrong
The cremasteric reflex cuts one way. Its absence supports torsion; its presence does not exclude it— and it’s far less sensitive in adults than in boys under 12. A normal-looking reflex has talked more than one tired team out of the right operation. Use it to raise concern, never to lower it.
The fork: how worried are you?
Everything funnels into one decision, and it determines whether imaging is even part of the plan.
High clinical suspicion → straight to the OR for scrotal exploration. You do not let a Doppler delay an obvious torsion. If ultrasound isn’t readily available, you do not wait — you mobilize the room.
Color Doppler earns its place only when the picture is genuinely equivocal: it shows absent or asymmetric flow, or the “whirlpool” sign of the spiral cord. But two traps live here. Flow can be falsely preserved in partial or intermittent torsion. And a tender testis with normal Doppler in a man whose pain started yesterday may be a torsion that detorsed on its own — still a salvageable OR case, not a reassurance.
When clinical and Doppler disagree, clinical wins. A scrotum that looks like torsion goes to the OR. The Doppler is a tiebreaker, not a verdict.
In the room
Scrotal approach through the midline raphe. Detort the affected testis, wrap it in warm gauze, and wait ten minutes for it to declare. Viable gets three-point fixation with non-absorbable suture; non-viable gets orchiectomy with counselling about fertility and testosterone. Either way, you fix the contralateral side at the same operation — the bell-clapper deformity that allowed this is almost always bilateral.
The differential you’re ruling against
- Epididymo-orchitis — gradual, dysuria or discharge, increased flow on Doppler; the workup tolerates time.
- Torsed appendix testis — pre-pubertal, focal “blue dot” at the upper pole, viable testis, managed conservatively.
- Incarcerated hernia, trauma/rupture, referred pain — usually separated by exam and history.
If you remember one thing
When torsion is a real possibility, the safest move and the fastest move are the same move. A negative exploration costs little. Waiting for certainty costs the testis.