Scrotal ultrasound with Doppler examines the testes, epididymides, scrotal fluid and blood flow. It is the main imaging test for a testicular lump or acute scrotal pain and is also used selectively in infertility and varicocele assessment. Most ultrasound findings are benign, such as small hydroceles or epididymal cysts. The most important distinction is whether an abnormality is inside the testis (intratesticular) or outside it: a solid intratesticular mass is more concerning and usually needs prompt urological review, while many extratesticular cysts are benign.

Testicular size and echotexture

The report may list three dimensions and calculate volume. Testicular volume varies with age and method; marked asymmetry or small volume can be relevant in infertility, prior torsion, undescended testis or testicular injury. “Homogeneous echotexture” means the tissue looks uniform, which is generally reassuring.

Blood flow on Doppler

Doppler compares vascularity between the testes. In acute pain, absent or markedly reduced intratesticular flow raises concern for torsion, although early or intermittent torsion can be challenging. Increased flow can be seen with epididymo-orchitis. Ultrasound findings must be matched to the timing and examination because suspected torsion is a time-sensitive diagnosis.

Varicocele

A varicocele appears as dilated veins of the pampiniform plexus, often with increased calibre during standing or Valsalva and demonstrable reflux. Ultrasound can support the diagnosis, but treatment decisions in infertility are usually based on a clinical/palpable varicocele, semen abnormalities and the couple’s fertility context rather than vein diameter alone.

Hydrocele and epididymal cysts

A hydrocele is fluid around the testis. Small asymptomatic hydroceles often need no treatment. Epididymal cysts/spermatoceles are usually benign fluid-filled lesions outside the testis. Surgery is considered mainly for troublesome size or pain, not simply because a cyst is present.

Testicular microlithiasis

Microlithiasis appears as multiple tiny bright foci. By itself, it usually does not mean cancer and routine repeated ultrasound is not needed for every patient. Follow-up depends on additional testicular-cancer risk factors and examination findings.

Solid testicular lesion

A solid intratesticular mass, particularly if vascular, requires prompt specialist assessment. Tumour markers such as AFP, beta-hCG and LDH and further management may be needed. A testicular mass is generally not biopsied through the scrotum as a routine first step because the standard oncological pathway is different from many other organs.

Incidental calcifications and tiny lesions

Small extratesticular calcifications, scrotal pearls and tiny epididymal cysts are commonly incidental. Their presence should not distract from the testicular examination or the main indication for scanning. If a tiny intratesticular lesion is indeterminate rather than clearly malignant, expert ultrasound review, tumour markers and short-interval imaging may sometimes be considered; the management pathway depends on size, vascularity and clinical risk rather than the word “lesion” alone.

How acute pain changes interpretation

In a painless infertility scan, the radiologist can take time to document varicocele reflux or testicular volume. In sudden severe pain, the priority changes: torsion must be excluded quickly. A reassuring ultrasound obtained after pain has completely resolved does not always explain an intermittent torsion episode, so the clinical history remains important.

Similarly, increased epididymal/testicular blood flow supports inflammation but does not identify the organism. Urine testing, STI assessment in appropriate patients and examination guide treatment. Ultrasound describes anatomy and perfusion; it does not replace the clinical diagnosis.

What changes urgency on a scrotal ultrasound

For an incidental varicocele, hydrocele or epididymal cyst, the report can usually be reviewed electively. Acute severe pain is different: the key Doppler question becomes whether testicular perfusion is preserved and whether the morphology suggests torsion, epididymo-orchitis or another acute process.

A solid intratesticular lesion is also different from an epididymal or tunical cyst. Solid lesions inside the testis generally need prompt urological assessment and tumour-marker planning rather than needle biopsy through the scrotum.

What to bring for consultation

• Ultrasound images and Doppler measurements.
• Previous scans for size comparison.
• Semen analysis and hormones when infertility is the reason for testing.
• Tumour markers if a mass was identified.
• Details of pain onset, trauma, surgery, undescended testis or prior torsion.

FAQs

Related reading

• Semen Analysis Report Explained
• FSH, LH and Prolactin in Men
• Testosterone Report Explained
• Urologist in Latur

References

• American Urological Association/American Society for Reproductive Medicine. Diagnosis and Treatment of Infertility in Men: AUA/ASRM Guideline (2020; amended 2024) https://www.auanet.org/guidelines-and-quality/guidelines/male-infertility
• European Association of Urology. EAU Guidelines on Sexual and Reproductive Health: Management of Erectile Dysfunction. 2026 https://uroweb.org/guidelines/sexual-and-reproductive-health