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This is a clinician-written, evidence-based guide aligned to the MCC Examination Objectives. It is structured by clinical presentation — the way the MCCQE tests and the way patients actually present. Management reflects current Canadian guidelines (CMA, CFPC, CPS). Always cross-reference with institutional protocols and clinical judgment.
Key points
- Sudden severe unilateral testicular pain with high-riding horizontal testis, nausea/vomiting, and absent cremasteric reflex = torsion until proven otherwise
- Do not delay surgical exploration for imaging when torsion is clinically likely or imaging would delay care
- Epididymitis is usually more gradual with urinary/STI symptoms, posterior tenderness, fever, and preserved cremasteric reflex
- Always examine abdomen/groin for incarcerated or strangulated inguinal hernia
- Scrotal pain can be referred from ureteric stone; ask about flank-to-groin colic and hematuria
Approach to the Presentation
The MCC scrotal pain objective stresses urgency and sudden onset because testicular torsion is time-sensitive. The presentation requires rapid history, abdominal/groin/genital examination, analgesia, and immediate urology involvement if torsion cannot be excluded. Doppler ultrasound is useful only when it is rapidly available and does not delay definitive management.
Differential Diagnosis
| diagnosis | likelihood | key features | distinguishing test |
|---|---|---|---|
| Testicular torsion | must-not-miss | Sudden severe unilateral pain, nausea/vomiting, high-riding horizontal testis, absent cremasteric reflex, adolescent/young adult | Clinical diagnosis; urgent surgical exploration; Doppler ultrasound only if it does not delay |
| Incarcerated/strangulated inguinal hernia | must-not-miss | Groin/scrotal mass, abdominal pain, vomiting, obstruction signs, irreducible tender swelling | Clinical exam; ultrasound/CT if uncertain; urgent surgery if strangulated |
| Fournier gangrene | must-not-miss | Severe pain, fever, toxicity, diabetes/immunocompromise, crepitus, skin necrosis | Clinical diagnosis; CT may define extent but do not delay debridement |
| Testicular tumour with haemorrhage/infarction | must-not-miss | Painful swelling or heaviness, firm intratesticular mass, systemic symptoms rare | Scrotal ultrasound; tumour markers; urology |
| Epididymitis / epididymo-orchitis | common | Gradual posterior pain, urinary symptoms or STI risk, fever, epididymal tenderness, Prehn sign unreliable | Urinalysis/culture, NAAT for gonorrhoea/chlamydia, Doppler shows increased flow |
| Torsion of testicular appendage | common | Prepubertal boy, localized upper pole pain, blue dot sign, less systemic upset | Clinical/ultrasound; normal testicular flow |
| Trauma / haematocoele / rupture | common | Direct blow, swelling, ecchymosis, severe pain; rupture threatens testicular viability | Scrotal ultrasound; urology if rupture/haematocoele |
| Hydrocoele / varicocoele | less common | Swelling more than pain; hydrocoele transilluminates; varicocoele bag-of-worms, worse standing | Clinical ± ultrasound |
| Referred ureteric stone pain | less common | Flank colic radiating to testis/groin, hematuria, normal testicular exam | Urinalysis and CT/ultrasound for stones |
Red Flags & Key History
Symptoms
Sudden severe unilateral pain with nausea/vomiting — torsion
Irreducible groin/scrotal mass with vomiting or obstruction symptoms — incarcerated hernia
Severe pain with fever, toxicity, crepitus, skin necrosis — Fournier gangrene
Trauma with marked swelling or suspected rupture
Gradual pain with dysuria/urethral discharge — epididymitis/urethritis
Flank-to-groin colic and hematuria — renal colic referral
Signs
High-riding horizontal testis or absent cremasteric reflex
Perineal crepitus, necrosis, severe tenderness out of proportion
Irreducible tender inguinal mass
Blue dot sign
Approach to Investigation
First-line
Clinical torsion assessmentDo not let labs delay urology if torsion likely
Urinalysis and urine culturePyuria/bacteriuria supports infection but normal urine does not rule out torsion
STI NAATIf sexually active or urethritis risk: chlamydia/gonorrhoea NAAT
Scrotal Doppler ultrasoundReduced/absent flow in torsion; increased flow in epididymo-orchitis; use only if rapidly available
Second-line
CBC/CRP/blood culturesIf systemic infection, sepsis, Fournier gangrene, or severe epididymo-orchitis
CT abdomen/pelvisIf incarcerated hernia, Fournier extent, or ureteric stone mimic suspected
Specialist
Immediate urology/surgery consultationTorsion, Fournier, rupture, incarcerated hernia, tumour, abscess, or diagnostic uncertainty with severe pain
Tumour markersAFP, beta-hCG, LDH if intratesticular mass suspected
Management Principles
MCC Scrotal Pain Objective + Canadian urology emergency practice1
Suspected torsion
- Immediate urology consultation and surgical exploration/orchiopexy
- Provide analgesia and antiemetic; keep NPO
- Manual detorsion may be attempted if surgery delayed, but does not replace exploration
2
Epididymitis/orchitis
- Analgesia, scrotal support, antibiotics guided by STI vs enteric risk and local guidance
- Test/treat partners when STI suspected
- Reassess if no improvement or abscess/alternative diagnosis suspected
3
Other emergencies
- Fournier: broad-spectrum antibiotics and urgent surgical debridement
- Incarcerated hernia: urgent surgical pathway
- Traumatic rupture: urgent urology repair
Complications & Pitfalls
- Ultrasound delay: If torsion is clinically likely, do not wait for imaging.
- Prehn sign: Relief with elevation is unreliable and should not exclude torsion.
- Age trap: Torsion can occur outside adolescence.
- Hernia miss: Always examine groin and abdomen.
- STI care: Epididymitis in younger sexually active patients requires STI testing and partner management.
MCCQE1 Exam Tips
- 1Acute scrotum = torsion until proven otherwise
- 2High-riding transverse testis + absent cremasteric reflex = urgent surgical exploration
- 3Doppler ultrasound is not the next best step if it delays surgery
- 4Epididymitis is gradual and often infectious; torsion is sudden and vascular
- 5Fournier gangrene needs antibiotics plus debridement, not antibiotics alone
- 6Always ask sexual history and urinary symptoms, but do not let them falsely reassure you against torsion
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