Can an Ultrasound Detect Testicular Cancer?
Yes — scrotal ultrasound is the first-line test and it is very good at this. Here is what it shows, what the reassuring findings look like, and why testicular lumps are handled differently from lumps elsewhere.
Yes. Scrotal ultrasound is the standard first investigation for a testicular lump, and it is unusually effective — the testicle sits close to the surface with no bowel gas or bone in the way, so image quality is excellent and small lesions are readily seen. It reliably distinguishes a solid mass within the testicle from the many harmless things that feel like a lump from the outside.
The most useful thing it does is often the reassuring one. A large proportion of scrotal lumps turn out to be cysts, varicoceles or fluid collections sitting alongside the testicle rather than in it — and that distinction can usually be made within minutes.
Do not wait, and do not self-diagnose from this page. Your GP can examine you and refer urgently where needed — testicular cancer has among the highest cure rates of any cancer, and that depends on acting rather than on the stage at which it is found. Sudden severe testicular pain, especially with nausea or in a younger man, needs A&E immediately: that can be testicular torsion, which is a surgical emergency measured in hours.
Inside the testicle, or beside it
This single distinction does most of the diagnostic work, and it is why a scan resolves so many cases quickly.
Outside the testicle (extratesticular) — overwhelmingly benign. Epididymal cysts and spermatoceles, varicoceles (dilated veins, often described as feeling like a bag of worms), and hydroceles (fluid around the testicle) all sit beside the testicle and are readily identified.
Inside the testicle (intratesticular) — a solid mass within the testicle itself is treated as suspicious until proven otherwise, and prompts urgent referral. Not every intratesticular finding is cancer; some are benign or inflammatory. But the threshold for referral is deliberately low, because the treatment works extremely well when acted on.
Alongside that, the scan assesses size, blood flow within the lesion, whether both testicles are involved, and whether there is anything else in the scrotum contributing to the symptom.
Why testicular lumps are not biopsied
People often expect a needle biopsy, because that is how a breast or thyroid lump would be investigated. Testicular masses are generally an exception. Passing a needle through the scrotum to sample a suspected tumour is avoided, because of the risk of disturbing the natural tissue planes that normally contain the disease.
Instead, where imaging and blood tests suggest a tumour, the standard route is surgical removal of the affected testicle through an incision in the groin — a procedure that provides the definitive diagnosis and the treatment in one step. That is why the pathway moves from scan to surgical referral rather than scan to biopsy, and why an urgent referral can feel like it is moving faster than you expected.
Blood tests sit alongside the scan: tumour markers including AFP, beta-hCG and LDH support diagnosis and are used afterwards to monitor treatment. Normal markers do not exclude a tumour, and a CT scan is used to assess whether disease has spread once a diagnosis is made.
What to check, and what is normal
Testicular cancer is most common in younger men — broadly the teens to forties — which is unusual among cancers and worth knowing, because it is the age group least likely to present early.
Checking is simple and worth doing regularly enough that you would notice a change: after a warm shower, roll each testicle gently between thumb and fingers, feeling for a firm lump within the testicle, a change in size or firmness, or a heavy dragging ache.
What is normal and frequently mistaken for a problem: one testicle sitting lower or being slightly larger; the epididymis, a soft comma-shaped structure along the back that most men can feel; and the cord above the testicle. Changes worth reporting are a firm lump within the testicle, an increase in size, a dull ache in the groin or abdomen, or any new heaviness.
Known risk factors include an undescended testicle in childhood, a family history, and having had a tumour in the other testicle. Most men diagnosed have none of them, so their absence is not reassurance.
Your questions answered
Can an ultrasound detect testicular cancer?
Does a scan give me a diagnosis?
Why is a testicular lump not biopsied like other lumps?
What does a benign testicular lump look like on ultrasound?
Are blood tests used as well?
What if I have sudden severe pain rather than a lump?
How treatable is testicular cancer?
Where to go from here
A lump answered the same appointment
Scrotal ultrasound by HCPC-registered sonographers, the finding shown to you on screen and explained in proportion, with a written report usually within two hours. See your GP as well — a scan complements that referral rather than replacing it.
Kensington, London W8 4ED
3 mins from Notting Hill Gate
This article is general information, not individual medical advice. Any new testicular lump or change should be assessed by your GP, who can refer urgently where appropriate; imaging identifies and characterises findings, but tissue examination provides the diagnosis. Sudden severe testicular pain needs emergency assessment for possible torsion.
Written and clinically reviewed by the HCPC-registered sonographers who perform this scan at IUS London — a CQC-registered diagnostic ultrasound clinic (Provider ID 1-2775844974). Your own findings are explained to you at the scan and set out in your report.
Author: Yianni Kiromitis, Senior Sonographer, HCPC RA38415
Medically reviewed: 4 August 2026
