Hydrocele in Children: Causes, Symptoms, and Surgical Treatment 2026

Noticing swelling in your baby boy’s scrotum can be a source of significant worry. A hydrocele — a fluid-filled sac surrounding the testicle — is one of the most common causes of scrotal swelling in infants and young children. Prof. Mohamed Elbarbary, Professor and Consultant of Pediatric Surgery at Cairo University’s Kasr Al-Ainy Medical School, with 36 years of experience and a Fellow of the Royal College of Surgeons of Edinburgh (FRCSEd 2026), provides expert diagnosis and treatment for this condition.

What Is a Hydrocele?

A hydrocele is a collection of fluid in the thin sac (tunica vaginalis) that surrounds the testicle, causing the scrotum to appear swollen. In children, hydroceles are almost always congenital and result from an incomplete closure of the processus vaginalis — the same passage involved in inguinal hernias. There are two types: a communicating hydrocele, where the passage remains open and fluid flows back and forth from the abdomen (this type may change in size throughout the day), and a non-communicating hydrocele, where the passage has closed but residual fluid remains trapped around the testicle. Hydroceles are very common in newborns, occurring in up to 10% of male infants.

Symptoms and Signs Parents Should Watch For

• Painless scrotal swelling: The most obvious sign — one or both sides of the scrotum appear larger than normal, often with a smooth, fluid-filled appearance
• Size changes throughout the day: A communicating hydrocele may be smaller in the morning and larger by evening, or increase with crying and activity
• Transillumination: When a light is held against the swollen scrotum, it glows through — this is because the swelling contains clear fluid rather than solid tissue
• No pain or discomfort: Most hydroceles are completely painless in infants and children
• Gradual increase in size: Over weeks or months, the swelling may gradually enlarge if the communicating passage remains open

When Is Surgery Necessary?

Many non-communicating hydroceles in newborns resolve on their own within the first 12 to 18 months of life as the fluid is gradually absorbed. Prof. Mohamed Elbarbary typically recommends a period of observation for infants with simple hydroceles.

However, surgery becomes necessary in the following situations: the hydrocele persists beyond 18-24 months of age; it is a communicating hydrocele (which will not resolve spontaneously); it continues to grow in size; it causes discomfort; or if there is concern about an associated inguinal hernia. Prof. Elbarbary emphasizes that a communicating hydrocele shares the same underlying anatomy as an indirect inguinal hernia and carries a risk of hernia development, making surgical correction important.

Parents should seek prompt medical evaluation if the scrotal swelling suddenly becomes hard, painful, red, or if the child develops vomiting — these may indicate an incarcerated hernia or testicular torsion, which are surgical emergencies.

How Is the Surgery Performed?

Hydrocele repair in children is a safe and straightforward procedure. Prof. Mohamed Elbarbary, with over three decades of experience at Abu Al-Reesh University Hospital, Cairo University, performs this surgery through a small inguinal (groin) incision — not through the scrotum as in adult hydrocele repair.

The procedure involves identifying and ligating (tying off) the processus vaginalis to prevent further fluid accumulation, and draining the existing fluid. This approach addresses both the hydrocele and any potential for hernia development. The surgery takes approximately 30-45 minutes, is performed under general anesthesia, and is typically a day-case procedure — your child goes home the same day.

Life After Surgery: Recovery and What to Expect

• Immediate recovery: Mild swelling and bruising in the scrotal area are normal and resolve within 1-2 weeks
• Pain management: Mild discomfort is managed with simple pain medication for 2-3 days
• Activity: Normal activities can resume within a few days; avoid rough play for 2 weeks
• Bathing: Keep the incision dry for 48 hours; gentle bathing after that
• Follow-up: Prof. Elbarbary schedules a follow-up visit at 1-2 weeks to check healing, and again at 3-6 months
• Recurrence: The recurrence rate after surgical repair is very low (less than 1%)

Frequently Asked Questions

Will a hydrocele go away on its own?

Non-communicating hydroceles in newborns often resolve by 12-18 months of age. Communicating hydroceles do not resolve spontaneously and require surgical repair.

Is hydrocele surgery safe for babies?

Yes, hydrocele repair is one of the safest pediatric surgical procedures. With Prof. Elbarbary’s extensive experience, complications are extremely rare.

How can I tell the difference between a hydrocele and a hernia?

Both can cause groin or scrotal swelling. A hydrocele is typically smooth, painless, and transilluminates (glows when a light is shone through it). A hernia may be more firm and may change size with crying. Prof. Elbarbary can make a definitive diagnosis with a clinical examination and, if needed, an ultrasound.

What is the cost of hydrocele surgery?

The cost depends on the hospital and specific case details. Please contact Prof. Elbarbary’s clinic for personalized information.

Your child’s health is our priority. If you have noticed scrotal swelling in your child, Prof. Mohamed Elbarbary can provide expert evaluation and care. With 36 years of experience at Cairo University, trust that your child will receive the highest standard of pediatric surgical care. Book your consultation today.