Scrotal pain and swelling
Exam Tips
- In OSCEs/vivas: state explicitly that acute unilateral painful swollen testis is torsion until excluded surgically.
- Do not rely on normal urinalysis or transient pain improvement to rule out torsion.
- An intratesticular solid mass is malignant until proven otherwise; urgent urology referral is required.
- Use pattern recognition: sudden severe pain with nausea/vomiting favors torsion; gradual pain with urinary/STI features favors epididymo-orchitis.
- Mention the blue-dot sign as suggestive (not definitive) of appendix torsion in prepubertal boys.
Definition
Scrotal pain and swelling is a symptom complex rather than a single diagnosis, ranging from benign extra-testicular lesions to time-critical vascular emergencies. In UK clinical practice, any acute unilateral painful swollen testis is managed as testicular torsion until proven otherwise, because delay in detorsion increases ischaemic loss and future subfertility risk.
Pathophysiology
Mechanisms include: (1) vascular compromise (spermatic cord twisting in testicular torsion, often intravaginal from a bell-clapper deformity; extravaginal torsion in neonates), causing venous obstruction then arterial ischaemia and infarction; (2) infection/inflammation (epididymitis-orchitis) from ascending genitourinary pathogens or sexually transmitted organisms; (3) fluid or blood accumulation (hydrocele, haematocele) within tunica vaginalis; (4) venous dilatation (varicocele); and (5) neoplasia (testicular germ-cell tumour, scrotal squamous malignancy). Torsion of appendix testis/epididymis causes localized ischaemia of embryological remnants and is usually self-limiting. See Figure from standard urology anatomy chapters showing bell-clapper deformity and spermatic cord twist.
Risk Factors
- Age peaks for torsion: neonates and pubertal adolescents (around 13-16 years)
- Bell-clapper deformity or previous intermittent testicular pain suggestive of intermittent torsion
- Possible underlying testicular tumour (raises torsion risk and may present as swelling)
- Sexually transmitted infection risk (new/multiple partners, unprotected intercourse) for epididymo-orchitis
- Older age, urinary tract instrumentation, bladder outlet obstruction, or recurrent UTI for enteric epididymo-orchitis
- Patent processus vaginalis/indirect inguinal hernia predisposition
- History of trauma or anticoagulation (risk of haematocele)
Clinical Features
Symptoms
- Sudden severe unilateral scrotal pain (classically torsion), sometimes with lower abdominal pain, nausea, or vomiting
- Gradual onset scrotal pain with dysuria, frequency, urethral discharge, or fever (suggests epididymo-orchitis)
- Painless testicular lump or heaviness (possible testicular cancer or hydrocele)
- Dragging discomfort worse on standing (possible varicocele)
- Recent trauma preceding swelling or pain (possible haematocele/testicular injury)
Signs
- High-riding, horizontally lying, very tender testis with tense hemiscrotum (torsion pattern)
- Absent or reduced cremasteric reflex on affected side (supports torsion, not fully exclusionary)
- Localized upper-pole tenderness or blue-dot sign (torsion of appendix testis)
- Tender swollen epididymis with overlying erythema/warmth, possible pyrexia (epididymo-orchitis)
- Transillumination of fluctuant swelling (hydrocele/epididymal cyst); non-transilluminating solid intratesticular mass is malignant until proven otherwise
- Irreducible or cough-impulse groin-scrotal mass (inguinal hernia)
Investigations
Management
Lifestyle Modifications
- Treat acute painful scrotum as an emergency: same-day transfer if torsion cannot be excluded
- Scrotal support, rest, and hydration for inflammatory causes
- Partner notification and abstain from sex until completion of treatment and symptom resolution in STI-related epididymo-orchitis
- Safety-net advice: return urgently for worsening pain, fever, vomiting, or persistent mass
Pharmacological Treatment
Analgesia/anti-inflammatory
- Paracetamol 1 g orally every 4-6 hours (max 4 g/day)
- Ibuprofen 400 mg orally three times daily with food (if suitable)
Avoid NSAIDs in active peptic ulcer disease, severe renal impairment, NSAID hypersensitivity, and use caution with anticoagulants; consider gastroprotection if higher GI risk.
Antibiotics for likely STI epididymo-orchitis
- Ceftriaxone 1 g intramuscular single dose
- Doxycycline 100 mg orally twice daily for 10-14 days
Check allergy history before cephalosporin use; avoid doxycycline in pregnancy and in children under 12 years; counsel on photosensitivity and taking with water upright.
Antibiotics for likely enteric epididymo-orchitis
- Ofloxacin 200 mg orally twice daily for 14 days
- Levofloxacin 500 mg orally once daily for 10 days
Fluoroquinolones carry MHRA safety warnings (tendon injury, neuropathy, CNS effects, aortic risk); avoid in previous quinolone serious adverse reaction and use cautiously in older adults or corticosteroid users.
Surgical / Interventional
- Emergency scrotal exploration and detorsion for suspected testicular torsion, with bilateral orchidopexy if testis viable
- Orchidectomy if non-viable torsed testis
- Urgent repair for strangulated/obstructed inguinal hernia
- Radical inguinal orchidectomy for suspected testicular malignancy (avoid trans-scrotal biopsy)
- Elective procedures where indicated: hydrocelectomy, varicocele treatment, excision of symptomatic epididymal cyst
Complications
- Testicular ischaemia, infarction, atrophy, or loss after delayed torsion treatment
- Subfertility/infertility after severe torsion or bilateral damage
- Contralateral torsion risk if not fixed surgically
- Abscess formation or sepsis in severe epididymo-orchitis
- Incarceration/strangulation in inguinal hernia
- Metastatic spread from delayed testicular cancer diagnosis
Prognosis
Outcome depends on cause and speed of intervention. Torsion has best salvage rates with very early detorsion, while delays markedly increase atrophy/orchidectomy risk. Infective causes usually improve with appropriate antibiotics, and testicular cancer generally has high cure rates when diagnosed and treated promptly through specialist pathways.
Sources & References
✅NICE Guidelines(1)
- Scrotal pain and swelling[overview]
📖Textbook References(4)
- Netter F. Netter Atlas of Human Anatomy. A Systems Approach 8ed 2022.pdf(pp. 11, 12)[context]
- _OceanofPDF.com_Netters_Anatomy_-_8th_edition_-_Frank_H_Netter_MD.pdf(pp. 11, 12)[context]
- [Williams, Bailey and Love's Short Practice of Surgery] Norman Williams, Christopher Bulstrode, P Ronan O'Connell - Bailey & Love's Short Practice of Surgery 26E (2013, CRC Press) - libgen.li.pdf(pp. 1399)[context]
- [Williams, Bailey and Love's Short Practice of Surgery] Norman Williams, Christopher Bulstrode, P Ronan O'Connell - Bailey & Love's Short Practice of Surgery 26E (2013, CRC Press) - libgen.li.pdf(pp. 1399)[context]