Hydrocele: Understanding Causes, Symptoms, and Treatment Options

A communicating hydrocele occurs when the passageway between the abdomen and scrotum (processus vaginalis) remains open after birth. This allows fluid to flow freely between the abdominal cavity and scrotal sac. The swelling typically varies in size throughout the day—often larger after physical activity and smaller after rest. This type frequently appears in infants and children.

In a non-communicating hydrocele, the processus vaginalis has closed, but fluid remains trapped within the tunica vaginalis. The body continues producing fluid that cannot be reabsorbed efficiently, leading to gradual accumulation. This type is more common in adults and typically maintains a relatively constant size.

This less common variant occurs when fluid accumulates along the spermatic cord (the structure containing blood vessels and the tube carrying sperm) rather than around the testicle. It presents as a separate, distinct swelling above the testicle.

While hydroceles are generally harmless, certain situations warrant prompt medical attention. Consult a urologist if you notice:

• Any new swelling in the scrotum, regardless of size
• Rapid increase in scrotal size over a short period
• Pain or tenderness accompanying the swelling
• Redness or warmth in the scrotal skin
• Fever or feeling generally unwell
• Difficulty urinating or changes in urinary patterns
• Swelling that doesn’t reduce after rest

Early evaluation is particularly important to rule out other conditions that may present similarly (such as inguinal hernia, testicular tumour, or epididymal cyst). These conditions require different management approaches, making accurate diagnosis essential.

During your first consultation, the urologist will take a detailed medical history and perform a thorough physical examination. This may include examining the swelling while you’re standing and lying down, checking whether the swelling reduces with gentle pressure, and assessing whether light passes through the swelling (transillumination test).

The initial assessment involves careful palpation of the scrotum to evaluate the swelling’s characteristics. The urologist checks for tenderness, assesses the size and consistency of the swelling, and determines whether the testicle can be felt separately from the fluid collection.

This simple bedside test involves shining a light through the swelling. Hydroceles allow light to pass through (positive transillumination), appearing as a red glow, because they contain clear fluid. Solid masses do not transilluminate. This test helps distinguish hydroceles from other scrotal conditions quickly and painlessly.

Ultrasound imaging provides detailed imaging for scrotal swellings. This non-invasive, painless test uses sound waves to create detailed images of the scrotal contents. It can:

• Accurately measure the amount of fluid present
• Assess the condition of the testicle itself
• Identify any associated abnormalities

Results are typically available immediately, providing valuable information to support further evaluation.

Your doctor may order blood tests to check for infection markers or tumour markers if there’s any concern about the underlying testicle. Laboratories usually process these within a few days.

If a communicating hydrocele is suspected, additional imaging such as a CT scan (which uses X-rays to create detailed cross-sectional images of the body) may occasionally be required to assess the connection with the abdominal cavity.