Hydrocele
Fluid collection within the tunica vaginalis surrounding the testis.
Also known as: hydrocele, communicating hydrocele, non-communicating hydrocele
Overview
Accumulation of serous fluid between the parietal and visceral layers of the tunica vaginalis. Communicating hydroceles (more common in infants) have a patent processus vaginalis allowing peritoneal fluid to enter the scrotum; non-communicating hydroceles (more common in adults) result from imbalance between fluid production and absorption.
Epidemiology
Up to 5% of newborn males; most communicating hydroceles resolve spontaneously by 12-24 months. In adults, prevalence ~1%; incidence increases with age.
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Risk factors
- Pediatric: patent processus vaginalis (failure of closure after testicular descent)
- Adult: trauma, infection (epididymitis, orchitis, filariasis worldwide), inguinal/scrotal surgery, malignancy (reactive hydrocele around tumor), torsion
Pathophysiology
Communicating: patent processus vaginalis allows free peritoneal fluid to enter the tunica vaginalis; size fluctuates with activity. Non-communicating: increased fluid production (inflammation) or impaired lymphatic absorption produces a persistent collection. Reactive hydroceles can develop around tumors or after epididymitis.
Clinical presentation
Symptoms
- Painless scrotal swelling (most common)
- Heaviness, dragging sensation
- Acute swelling and pain suggest infection, torsion, or hemorrhage into the hydrocele
Signs / physical exam
- Soft, cystic, non-tender scrotal enlargement that transilluminates with a light source
- Testis often not palpable separately when hydrocele is large
- Communicating hydrocele in a child may change size with crying, straining, or activity
Differential diagnosis
- Varicocele — 'Bag of worms,' worse standing, Valsalva-augmented; does not transilluminate
- Inguinal hernia (reducible) — Bowel sounds, reducibility, extends through inguinal canal
- Testicular tumor — Solid intratesticular mass on US; reactive hydrocele may accompany tumor — always image
- Epididymal cyst / spermatocele — Cystic mass in epididymis, separable from testis
- Testicular torsion (acute) — Acute pain, tender high-riding testis, absent cremasteric reflex; emergent
- Acute epididymo-orchitis — Pain, fever, tender swollen epididymis; pyuria; reactive hydrocele possible
Diagnostic workup
Diagnostic criteria
Clinical findings of a transilluminating cystic scrotal swelling; ultrasound confirms when needed.
Labs
- Not routinely required
- Urinalysis and STI testing if concurrent epididymitis suspected
Imaging
- Scrotal ultrasound — confirms diagnosis, evaluates underlying testis for tumor, infection, torsion, and distinguishes from other scrotal masses
- Indicated in any adult with a new hydrocele, in any palpable scrotal mass that does not transilluminate clearly, or when the testis cannot be palpated
Diagnostic algorithm
| Feature | Communicating Hydrocele | Non-Communicating Hydrocele |
|---|---|---|
| Age | Infants/children typically | Adults more often |
| Size | Fluctuates with activity/crying | Constant |
| Patent processus vaginalis | Yes | No |
| Spontaneous resolution | Common <2 yr | Rare |
| Treatment if persistent/symptomatic | Inguinal ligation of PPV (hernia-style repair) | Hydrocelectomy |
Treatment
First-line
- Infants: observation up to 12-24 months — most communicating hydroceles resolve spontaneously
- Asymptomatic adult hydrocele: observation
- Symptomatic adult hydrocele (pain, discomfort, cosmetic concern, very large): surgical hydrocelectomy (excisional or plication techniques such as Lord, Jaboulay, or Bergman) — definitive treatment
- Communicating hydrocele in a child persisting >12-24 months or symptomatic: ligation of patent processus vaginalis through inguinal approach (similar to pediatric inguinal hernia repair)
Second-line / adjunct
- Aspiration with sclerotherapy (tetracycline, doxycycline, polidocanol) — option in poor surgical candidates; higher recurrence
- Simple needle aspiration alone has very high recurrence and is generally not recommended
Complications
- Discomfort, cosmetic concerns, impaired sexual activity if large
- Infection (rare), hemorrhage into the hydrocele
- Post-surgical: recurrence, hematoma, infection, injury to testis or spermatic cord
PANCE pearls
- Always obtain a scrotal ultrasound in any new adult hydrocele to exclude an underlying testicular tumor (reactive hydrocele).
- Communicating hydroceles in infants typically resolve spontaneously by 12-24 months and do not require intervention; persistence beyond that age warrants surgical correction.
- Hydroceles transilluminate; hernias and solid masses do not.
- A hydrocele that prevents adequate palpation of the testis should be imaged — do not assume the underlying testis is normal.
- Distinguish a non-communicating hydrocele in an infant (often resolves) from a communicating one with fluctuating size — the latter is functionally an inguinal hernia and requires repair.
References
- AUA — AUA Adult Hydrocele Position Statement and patient educational materials
- EAU Pediatric Urology — EAU Guidelines on Paediatric Urology — hydrocele section
- AAP — AAP guidance on management of communicating hydrocele in infancy
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