Painful Lump Beside the Testicle - Clinical Approach

Differential Diagnosis

1. Epididymitis / Epididymo-orchitis (MOST COMMON)

• Scrotal pain of gradual onset (distinguishes it from torsion's sudden onset)
• Pain may initially reside in the lower abdomen or flank (vas deferens inflammation)
• Tenderness starts localized to the epididymis, then spreads to the ipsilateral testis
• Scrotum may become edematous and erythematous
• Testis in normal anatomic position, with an intact cremasteric reflex
• Fever is uncommon but possible
• Urethral discharge only in ~10% of sexually acquired cases

2. Testicular Torsion (EMERGENCY - Must Exclude First)

• Sudden-onset severe pain - the key differentiator
• Testicle often elevated/transverse lie ("bell clapper" deformity)
• Absent cremasteric reflex - highly suggestive
• No fever, no urinary symptoms
• Peak ages: neonates and puberty
• Surgical emergency - viability depends on time from onset

⚠️ No single history or physical finding reliably distinguishes torsion from epididymitis. When in doubt, urgent scrotal Doppler ultrasound is essential.

3. Torsion of Appendix Testis (Most Common Cause of Acute Scrotum Overall - 40-60%)

• Small appendage (embryological remnant) on the upper pole of the testis twists
• Pain onset can be abrupt but usually less severe than cord torsion
• Classic "blue dot sign" - bluish tender nodule visible through scrotal skin in thin patients
• Cremasteric reflex intact
• Managed conservatively with NSAIDs, scrotal support

4. Epididymal Cyst / Spermatocele

• Usually painless (pain if large, tense, or infected)
• Smooth, transilluminable cyst at the head of the epididymis
• Spermatocele contains milky fluid with spermatozoa
• Managed conservatively unless symptomatic

5. Varicocele

• Dilated pampiniform plexus veins - feels like "bag of worms"
• 90% on the left side (due to left gonadal vein draining into left renal vein at a right angle)
• Dull aching pain, often worse on standing or Valsalva
• Important cause of male infertility

6. Hernia / Hydrocele

• Inguinal hernia can present as a paratesticular lump
• Hydrocele: fluid collection around the testis - transilluminates
• Can become painful if incarcerated (hernia) or infected

7. Other (Less Common)

• Paratesticular tumor (e.g., rhabdomyosarcoma in young males, lipoma, adenomatoid tumor) - usually painless but pain if large or hemorrhagic
• Hematocele - blood in tunica vaginalis (trauma history)
• Orchitis - mumps, vasculitis (HSP in children)

Clinical Examination

Investigations

• Scrotal Doppler ultrasound - gold standard; shows absent/reduced blood flow in torsion, increased flow in epididymitis

• Urinalysis + urine culture (pyuria suggests epididymitis)
• Urethral swab / first-void PCR for Chlamydia and Gonorrhoeae (if STI risk)
• FBC (leukocytosis = nonspecific but supports infection)
• Serum tumor markers (AFP, b-hCG, LDH) if malignancy suspected

Management

Epididymitis Treatment (from Rosen's Emergency Medicine)

If Torsion Cannot Be Excluded

• Immediate surgical exploration - do not wait for investigations
• Time to detorsion is critical: >99% salvage within 6 hours, drops sharply after 12 hours

Key Clinical Rule

"If in doubt - rule out torsion first." A painless lump is more likely to be a benign cyst, spermatocele, or varicocele. A painful lump that came on suddenly must be treated as torsion until proven otherwise. A painful lump with gradual onset + urinary symptoms + age <35 with STI risk strongly points to epididymitis.

Appropriate Specialist(s)

1. Urologist — Primary Specialist

• Epididymitis / epididymo-orchitis
• Testicular torsion (surgical exploration)
• Varicocele
• Hydrocele / spermatocele
• Paratesticular tumors
• Recurrent infections with underlying urinary tract abnormalities

2. Emergency Physician — First Contact (if acute)

Referral Pathway Summary

Acute sudden pain
→ Emergency Department → Emergency Urologist (surgical exploration)

Gradual onset pain + urinary symptoms
→ General Practitioner (initial antibiotics + urine PCR)
→ Refer to Urologist if no improvement, recurrence, or imaging needed

Suspected malignancy / painless hard lump
→ Urgent Urologist referral (within 2 weeks)

Secondary Specialists (Specific Scenarios)

Bottom Line