What it is (overview)

A scrotal ultrasound scan (also called a testicular ultrasound or scrotum ultrasound) is a safe, non-invasive diagnostic imaging test that uses high-frequency sound waves to create real-time pictures of the structures inside the scrotum. It evaluates the testes (testicles), epididymis, and surrounding tissues, and often includes Doppler ultrasound to check blood flow. Unlike X-rays or CT scans, ultrasound does not use radiation.

The scan helps your clinician assess testicular health by looking for changes in size, shape, tissue appearance, fluid collections, and blood supply. This is especially important when diagnosing causes of scrotal swelling, a lump, or pain diagnosis for sudden or ongoing discomfort.

What results usually mean (in plain language):

Ultrasound results are typically reported as normal or as showing a specific finding. A “normal” study means the testicles and surrounding structures look healthy, with no suspicious masses and normal blood flow.

If an abnormality is seen, the report may describe findings such as:

• Reduced or absent blood flow, which can suggest testicular torsion (a time-sensitive emergency that can threaten the testicle if not treated quickly).

• Increased blood flow and swelling, which often points to inflammation or infection (for example, epididymitis/orchitis).

• Dilated veins above the testicle, consistent with a varicocele, which may be linked to discomfort or male fertility concerns.

• A fluid collection around the testicle (such as a hydrocele) or near the epididymis (such as a spermatocele).

• A solid mass within the testicle, which can be concerning for a testicular tumor and typically prompts urgent specialist follow-up and additional testing.

Your healthcare provider will interpret the ultrasound in context with your symptoms, exam findings, and (if needed) blood or urine tests.

When & why it's usually done

A scrotal ultrasound is usually ordered when a clinician needs a fast, accurate way to evaluate symptoms affecting the scrotum and testes. It is one of the most common first-line tests for scrotal concerns because it can quickly distinguish between conditions that are harmless and those needing urgent treatment.

Your doctor may recommend a scrotal ultrasound if you have:

• Scrotal pain (sudden, severe pain is especially concerning and may be evaluated urgently to rule out testicular torsion).

• Scrotal swelling or a feeling of heaviness.

• A lump, mass, or change in testicle size found by you or on a physical exam.

• Symptoms of infection, such as tenderness, warmth, fever, or painful urination (to assess for epididymitis/orchitis and complications).

• Concerns about male fertility, such as evaluation for a varicocele or changes in testicular size that may affect sperm production.

• A history of trauma to the groin or scrotum (to look for bleeding, rupture, or other injury).

• Follow-up of a known condition (monitoring a cyst, hydrocele, varicocele, or confirming resolution after treatment).

It may also be used to guide next steps if a healthcare professional suspects a testicular tumor or needs to clarify whether a lump is inside the testicle (more concerning) or outside it (often benign).

Common diseases related to it

• Varicocele
• Testicular torsion
• Testicular tumors (including suspected testicular cancer)
• Epididymitis
• Orchitis
• Hydrocele
• Spermatocele / epididymal cyst
• Testicular trauma (hematoma, rupture)
• Inguinal hernia extending into the scrotum
• Testicular atrophy (reduced testicle size)

Health goals where it may help

• Supporting testicular health by evaluating new pain, swelling, or a lump early
• Helping with pain diagnosis to distinguish urgent conditions (like torsion) from treatable causes (like infection)
• Assessing and monitoring male fertility factors, including possible varicocele-related issues
• Reassuring evaluation of scrotal swelling and benign fluid collections (such as hydrocele) when appropriate
• Early detection and follow-up of suspicious findings related to testicular tumors
• Monitoring recovery after treatment for infection, inflammation, or scrotal injury