Testicular ultrasound is the first-line imaging test for a suspected testicular mass. It uses sound waves, does not involve radiation and can usually distinguish a solid intratesticular lesion from fluid, inflammation or a lump outside the testicle. A solid mass inside the testicle is treated as potentially malignant until assessed properly, although ultrasound alone cannot always determine the exact tumour type. If cancer is suspected, the next steps usually include AFP, beta-hCG and LDH blood tests, urology review and staging rather than a routine needle biopsy through the scrotum.

What does the radiologist look for?

• Whether the lesion is inside or outside the testicle
• Solid versus cystic appearance
• Echogenicity and internal structure
• Blood flow on Doppler imaging
• Calcification or associated microlithiasis
• Condition of the opposite testicle
• Hydrocele, epididymal lesions or inflammatory changes

Intratesticular versus extratesticular mass

Location is one of the most useful clues. Solid intratesticular masses are more concerning for malignancy. Many extratesticular lumps arise from the epididymis or spermatic cord and are benign, although exceptions exist.

Can ultrasound tell seminoma from non-seminoma?

It can suggest features, but it cannot reliably replace pathology. Definitive classification usually comes from radical inguinal orchidectomy when a suspicious germ-cell tumour is present.

What if the ultrasound finding is very small or uncertain?

Small non-palpable lesions can be benign. Management may include repeat expert ultrasound, tumour markers, MRI in selected cases, testis-sparing surgery with frozen section in carefully chosen patients, or orchidectomy when malignancy is likely. The plan depends on lesion size, appearance, markers and patient factors.

What ultrasound cannot do

Ultrasound does not stage lymph nodes or distant spread. Once cancer is diagnosed, CT is used for staging. Normal ultrasound of the testicle also does not explain every cause of scrotal or groin pain.

Ultrasound pattern guides urgency, not final histology

A solid intratesticular vascular mass is suspicious for malignancy, whereas epididymal cysts, hydroceles and many extratesticular lesions are usually benign. Ultrasound can also show microlithiasis, inflammation or infarction. The scan narrows the differential but does not replace pathology when a germ-cell tumour is suspected.

Microlithiasis alone is not testicular cancer

Scattered testicular microliths are a common source of anxiety on reports. In the absence of additional risk factors or a mass, they do not automatically require serial ultrasound. Management is based on the whole risk profile and examination.

When an ultrasound “mass” is not treated immediately as cancer

Occasionally infection, trauma, infarction or a benign lesion produces an indeterminate focal abnormality. Tumour markers, clinical history and short-interval repeat imaging can help in carefully selected cases, but a convincing solid intratesticular tumour generally proceeds to urological cancer management rather than prolonged observation.

The ultrasound question is: inside the testicle or outside it?

Solid intratesticular masses are treated as potentially malignant until proven otherwise, whereas many extratesticular lesions—epididymal cysts, spermatoceles and some benign paratesticular masses—are non-cancerous. Doppler flow, echogenicity and associated findings refine the impression but cannot always establish histology. When ultrasound shows a suspicious intratesticular mass, tumour markers and urological review should follow promptly rather than repeated scans without a plan.

When to seek earlier medical review

Sudden severe testicular pain is an emergency because torsion must be excluded. A suspicious painless intratesticular mass should be reviewed promptly with tumour markers and urology rather than followed indefinitely with serial ultrasound alone.

What to bring to your consultation

• Scrotal ultrasound images/report
• Tumour markers if ordered
• Previous ultrasound for comparison
• Relevant prior testicular surgery/infection history

Questions to ask your doctor

• Is the lesion intratesticular and solid?
• Are tumour markers needed before any operation?
• Could this represent infarction, inflammation or another benign mimic that warrants repeat imaging?

FAQs

Related reading

• Testicular Cancer: Symptoms and Treatment
• Painless Testicular Lump: When to Worry
• Tumor Markers AFP, Beta-hCG and LDH Explained
• Radical Orchidectomy Explained
• Testicular Cancer and Fertility
• Kidney Mass Biopsy: When Is It Needed?
• Urologist in Latur

References

• European Association of Urology (EAU). Testicular Cancer Guidelines, 2026. Diagnostic Evaluation https://uroweb.org/guidelines/testicular-cancer/chapter/diagnostic-evaluation
• European Association of Urology (EAU). Testicular Cancer Guidelines, 2026. Disease Management https://uroweb.org/guidelines/testicular-cancer/chapter/disease-management
• European Association of Urology (EAU). Testicular Cancer Guidelines, 2026. Follow-up After Curative Therapy https://uroweb.org/guidelines/testicular-cancer/chapter/followup-after-curative-therapy
• National Cancer Institute. Testicular Cancer Treatment (PDQ) – Patient Version https://www.cancer.gov/types/testicular/patient/testicular-treatment-pdq