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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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
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
Comparison of communicating and non-communicating hydroceles.
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
Educational use only. This outline is a study aid for PA students and is not medical advice or a substitute for clinical judgment. FirstPassPA is an independent study tool and is not affiliated with, endorsed by, or sponsored by NCCPA. PANCE® and PANRE® are registered trademarks of the National Commission on Certification of Physician Assistants.