Male Reproductive

Epididymitis and orchitis: diagnosis and management

Clinical Overview and When to Suspect Epididymitis/Orchitis

— Sexually active men <35 years: predominantly sexually transmitted — Chlamydia trachomatis and Neisseria gonorrhoeae; consider Mycoplasma genitalium in refractory cases.

— Men who practice insertive anal intercourse: add enteric organisms (E. coli, other gram-negatives) to STI coverage.

— Men ≥35 years, prepubertal boys, post-instrumentation, BPH/obstruction: coliform bacteriuria — E. coli is dominant; consider Pseudomonas after recent urologic procedures.

— Isolated orchitis is rare and most often viral (mumps in unvaccinated; less commonly coxsackie, EBV).

Definition: Epididymitis = inflammation of the epididymis (most common intrascrotal inflammatory condition in adult men); orchitis = inflammation of the testis. The two frequently coexist as epididymo-orchitis because infection ascends from epididymis into the adjacent testis.

Epidemiology and bimodal etiology by age:

When to suspect: unilateral, gradual-onset (hours to days) scrotal pain with swelling, dysuria, urinary frequency, urethral discharge, or fever in a sexually active man — or an older man with LUTS, recent Foley, prostate biopsy, or TURP.

Red flag to exclude first: testicular torsion in any acute scrotum, especially <6 hour onset, age <25, abrupt severe pain, absent cremasteric reflex, high-riding testis — torsion is a surgical emergency with a 6-hour viability window.

Step 3 management: in the ambulatory clinic, the cognitive task is twofold — (1) rule out torsion clinically and with Doppler if any doubt, and (2) stratify by age/sexual history to choose empiric antibiotics targeting STI vs. coliform pathogens before cultures return.

Board pearl: Mumps orchitis classically appears 4–8 days after parotitis, is unilateral in ~70%, and may cause subfertility but rarely sterility; rising MMR vaccine refusal is reintroducing this on exams.

Presentation Patterns and Key History

— Gradual-onset (over 1–2 days) unilateral posterior scrotal pain that may radiate along the spermatic cord to the flank/lower abdomen.

— Scrotal swelling, erythema, warmth; reactive hydrocele common.

— Dysuria, urinary frequency, urgency, urethral discharge (STI etiology) or LUTS/hematuria (bacteriuria etiology).

— Low-grade fever; high fever and rigors suggest abscess or progression to Fournier gangrene.

— New or multiple partners in the last 60 days, condom use, partner symptoms.

— Specifically ask about insertive anal intercourse — changes empiric coverage to include enteric gram-negatives.

— Prior STIs, HIV status, PrEP use.

— BPH symptoms, recent Foley catheter, cystoscopy, TURP, prostate biopsy.

— Recurrent UTIs, neurogenic bladder, immunosuppression, diabetes.

— Mumps exposure or unvaccinated status + recent parotitis → viral orchitis.

— Travel to TB-endemic areas, chronic granulomatous epididymitis, intravesical BCG therapy for bladder cancer → tuberculous epididymitis.

— Amiodarone use → drug-induced epididymitis (dose-related, reversible).

— Recurrent unilateral pediatric epididymitis → suspect ectopic ureter or other GU anomaly.

Cardinal symptoms:

Targeted history — STI risk stratification (<35 yo):

Targeted history — bacteriuria risk (≥35 yo or atypical):

Targeted history — alternative etiologies:

Onset tempo is the key history element: subacute over days = epididymitis; abrupt over minutes to hours = torsion until proven otherwise.

Key distinction: A young man with hours-old, severe, nausea-inducing pain and no urinary symptoms is torsion; a young man with 2 days of worsening pain plus urethral discharge or dysuria is epididymitis. When in doubt, image — but do not delay urologic consultation while imaging is arranged if torsion is plausible.

Board pearl: Always document timing of symptom onset and sexual history verbatim in the chart — both drive the diagnostic and treatment pathway and are common shelf/CCS triggers.

Physical Exam Findings (and Scrotal Assessment)

— Unilateral hemiscrotal swelling, erythema, sometimes overlying skin warmth.

— Testis lies in normal vertical orientation (contrast with horizontal "bell-clapper" of torsion).

— Reactive hydrocele common; transilluminates.

— Tenderness localized to posterior epididymis early; later, inflammation spreads diffusely to involve testis (epididymo-orchitis), making localization difficult.

— Prehn sign: elevation of the scrotum relieves pain in epididymitis but not in torsion — supportive but not sensitive or specific enough to rule out torsion.

— Cremasteric reflex preserved in epididymitis; absent in torsion (most reliable bedside finding, especially in boys/young men).

— Spermatic cord may feel thickened and tender.

— Urethral inspection for discharge; milk urethra if needed to obtain specimen.

— Digital rectal exam: boggy tender prostate suggests concurrent prostatitis; defer vigorous massage in acute bacterial prostatitis (risk of bacteremia).

— Inguinal exam for hernia (can mimic scrotal pathology).

— Check for parotid swelling in suspected mumps.

— Vitals: tachycardia, fever; hypotension + crepitus + necrotic skin = Fournier gangrene → emergent surgical consult.

— Abdominal exam to exclude referred pain (appendicitis, ureteral colic).

— Epididymitis: gradual, posterior tenderness, cremasteric reflex present, Prehn positive (relief on elevation).

— Torsion: sudden, diffuse, high-riding transverse testis, cremasteric reflex absent, Prehn negative.

Inspection:

Palpation:

Adjunct exam:

Systemic assessment:

Key distinction:

Step 3 management: If your bedside exam cannot confidently exclude torsion in a young patient, call urology and order Doppler ultrasound simultaneously — do not serially delay. In CCS, the order set is "urology consult STAT, scrotal Doppler, NPO, IV access."

Board pearl: A palpable "blue dot" sign at the upper testis pole points to torsion of the appendix testis — self-limited, treated with NSAIDs and reassurance.

Diagnostic Workup — Initial Labs, Urethral Studies, and Doppler

— Urinalysis with microscopy — pyuria (>10 WBC/hpf) supports bacterial cause; absence does not rule out STI epididymitis.

— Urine Gram stain of first-void specimen — gram-negative rods suggest coliform; gram-negative intracellular diplococci suggest gonorrhea.

— Urine culture with sensitivities — essential before empiric antibiotics in coliform-pattern patients.

— NAAT for C. trachomatis and N. gonorrhoeae on first-catch urine or urethral swab — do this in all sexually active men regardless of age if epididymitis is suspected.

— Consider NAAT for M. genitalium in treatment-failure or persistent cases.

— CBC: leukocytosis supports bacterial infection but not required.

— CRP elevated.

— HIV, syphilis (RPR), hepatitis B/C screening — appropriate STI co-screening per CDC.

— Serum mumps IgM if clinical suspicion (post-parotitis orchitis in unvaccinated patient).

— Indication: any diagnostic uncertainty, especially to exclude torsion, and to assess for abscess.

— Epididymitis findings: enlarged hypoechoic epididymis with increased Doppler flow (hyperemia); reactive hydrocele; skin thickening.

— Orchitis findings: enlarged hypoechoic testis with increased flow.

— Torsion findings: decreased or absent intratesticular flow, "whirlpool" sign of twisted cord.

— Abscess: complex hypoechoic collection — requires drainage.

First-line laboratory studies:

Adjunctive labs:

Imaging — color Doppler scrotal ultrasound:

ECG/biomarkers: not relevant to scrotal disease per se, but obtain ECG before fluoroquinolone if QT prolongation risk (chronic disease, antiarrhythmics).

CCS pearl: Order set on day 1 — UA, urine culture, urine NAAT GC/CT, CBC, scrotal Doppler ultrasound, HIV/syphilis screen, plus partner notification and abstinence counseling for STI cases.

Board pearl: Increased Doppler flow distinguishes epididymitis from torsion; absent flow is torsion until surgically proven otherwise — do not be reassured by a normal-appearing testis on grayscale alone.

Diagnostic Workup — Advanced or Confirmatory Studies

— Repeat urine NAAT and add Mycoplasma genitalium NAAT — increasingly recognized cause of persistent urethritis/epididymitis.

— Urology referral for cystoscopy and post-void residual to evaluate bladder outlet obstruction, BPH, urethral stricture.

— Renal/bladder ultrasound or CT urography to exclude anatomic anomaly, stone, mass.

— In children with recurrent or culture-positive epididymitis: voiding cystourethrogram (VCUG) and renal ultrasound to evaluate for ectopic ureter, posterior urethral valves, or vesicoureteral reflux.

— Consider genitourinary tuberculosis — sterile pyuria, beaded vas deferens, history of BCG instillation or pulmonary TB.

— Send acid-fast bacilli (AFB) urine cultures × 3 first-void specimens, mycobacterial PCR.

— Brucellosis serology if exposure to unpasteurized dairy or livestock.

— Bedside Doppler identifies abscess; CT scrotum/pelvis delineates extent in suspected Fournier or deep extension.

— Surgical exploration is both diagnostic and therapeutic.

— A "painless" or persistently swollen testis after antibiotic course — repeat ultrasound in 4–6 weeks.

— Tumor markers: AFP, β-hCG, LDH — never miss a germ cell tumor in a young man whose "epididymitis" does not fully resolve.

When initial workup is inconclusive or course is atypical, expand evaluation:

Refractory or recurrent epididymitis (>2 episodes or failure of 2-week empiric therapy):

Chronic granulomatous or sinus-forming epididymitis:

Suspected abscess or Fournier gangrene:

Suspected testicular tumor masquerading as orchitis:

Mumps orchitis confirmation: mumps IgM serology and buccal swab RT-PCR; report to public health (mandatory reportable disease).

Key distinction: Persistent scrotal swelling after appropriate antibiotic therapy is testicular cancer until proven otherwise — order tumor markers and repeat imaging; do not extend antibiotics indefinitely.

Step 3 management: Build a structured follow-up plan at the index visit — "recheck in 2 weeks; if not improving, repeat exam + ultrasound + tumor markers + urology referral." This longitudinal thinking is the Step 3 differentiator.

Board pearl: A young man treated empirically for epididymitis whose mass persists at 6 weeks → think seminoma.

Risk Stratification and First-Line Management Logic

— Category A: Sexually active, <35 yo, no anal intercourse → empiric STI coverage (GC + CT).

— Category B: Sexually active man who practices insertive anal intercourse → empiric STI + enteric coverage.

— Category C: ≥35 yo, BPH, recent instrumentation, or low STI risk → empiric enteric/coliform coverage.

— Category D: Prepubertal boy → enteric coverage + evaluate for GU anomaly.

— Category E: Post-parotitis or recent mumps → supportive care only (no antibiotics).

— Outpatient management is appropriate for most: hemodynamically stable, tolerating PO, no abscess, reliable follow-up.

— Admit for: systemic toxicity/sepsis, suspected abscess, Fournier gangrene, intractable pain/vomiting, immunocompromise, failed outpatient therapy, or social barriers to follow-up.

— Scrotal elevation (jockstrap or rolled towel) — reduces venous congestion and pain.

— Cold compresses intermittently for first 48 hours.

— NSAIDs scheduled (ibuprofen 600 mg q6h) for analgesia and anti-inflammatory effect; acetaminophen if NSAID contraindicated.

— Bed rest for 1–2 days, then activity as tolerated.

— Abstinence from sexual activity until patient and partner(s) complete therapy and are asymptomatic (STI cases).

— Expedited partner therapy (EPT) where legal; report GC/CT to public health.

— Re-screen at 3 months for reinfection.

Step 1 — Exclude torsion clinically and with Doppler if any doubt. This is non-negotiable and time-critical (<6 hours).

Step 2 — Determine likely pathogen by patient profile:

Step 3 — Disposition decision:

Step 4 — Symptomatic adjuncts (always):

Step 5 — Public health and partner management for STI etiologies:

Step 3 management: The ambulatory algorithm is "rule out torsion → categorize patient → empiric antibiotic by category → scrotal support + NSAID + abstinence → 48–72 h phone check → in-person recheck at 2 weeks." Build the follow-up plan at the index visit.

Pharmacotherapy — First-Line Drug Regimen

— Ceftriaxone 500 mg IM × 1 (1 g if weight ≥150 kg) PLUS doxycycline 100 mg PO BID × 10 days.

— Covers N. gonorrhoeae and C. trachomatis; azithromycin no longer preferred for gonorrhea due to resistance.

— Ceftriaxone 500 mg IM × 1 PLUS levofloxacin 500 mg PO daily × 10 days (levofloxacin replaces doxycycline to cover enteric gram-negatives and chlamydia).

— Alternative: ceftriaxone + doxycycline + ciprofloxacin.

— Levofloxacin 500 mg PO daily × 10 days OR ciprofloxacin 500 mg PO BID × 10 days.

— Trimethoprim-sulfamethoxazole DS BID × 10 days if fluoroquinolone contraindicated.

— If recent urologic procedure or known Pseudomonas — consider extended coverage (cefepime or piperacillin-tazobactam) until cultures return.

— Scheduled NSAIDs × 10–14 days.

— Scrotal support, ice, abstinence, partner treatment.

Category A — STI coverage (<35 yo, no anal intercourse) — CDC 2021 STI guidelines:

Category B — STI + enteric coverage (insertive anal intercourse):

Category C — Enteric coverage (≥35 yo, post-instrumentation, BPH):

Category D — Prepubertal boys: TMP-SMX or cephalosporin per pediatric urology; pursue anatomic workup.

Mumps/viral orchitis: no antibiotics — supportive care (rest, NSAIDs, scrotal support, ice); steroids do not improve fertility outcomes despite historical use.

Mycoplasma genitalium (refractory cases): moxifloxacin 400 mg daily × 7–14 days after resistance-guided testing.

Tuberculous epididymitis: standard 4-drug RIPE therapy × 6 months under ID guidance.

Adjunctive therapy regardless of regimen:

CCS pearl: On day 1, order ceftriaxone 500 mg IM × 1 + doxycycline 100 mg PO BID × 10 days for a 24-year-old with urethral discharge and acute scrotum (after torsion excluded). Counsel on abstinence, EPT, condom use, repeat STI screen at 3 months.

Board pearl: Doxycycline is contraindicated in pregnancy but pregnancy is irrelevant here (male patient); it remains the first-line chlamydia agent for both partners — substitute azithromycin 1 g single dose only if doxycycline cannot be tolerated. Fluoroquinolones are no longer first-line for gonorrhea anywhere in the US.

Procedures and Refractory/Complicated Management

— Suspected by fluctuance, persistent fever despite 48–72 h antibiotics, or complex hypoechoic collection on ultrasound.

— Management: urology consult for incision and drainage, sometimes epididymectomy or orchiectomy if extensive necrosis.

— Cultures from drainage guide antibiotic narrowing.

— Surgical emergency — high mortality (20–40%).

— Diabetics, immunocompromised, alcohol use disorder at highest risk.

— Findings: crepitus, dusky/necrotic skin, pain out of proportion, systemic toxicity, gas on imaging.

— Management: immediate broad-spectrum IV antibiotics (piperacillin-tazobactam + vancomycin + clindamycin for toxin suppression) + emergent surgical debridement + ICU support.

— Late complication of severe epididymo-orchitis or untreated abscess.

— May necessitate orchiectomy.

— Trial of prolonged antibiotics if culture-positive; otherwise, neuropathic pain agents (gabapentin, TCAs), pelvic floor PT.

— Epididymectomy is last resort with variable outcomes — refer to urology.

— Outpatient option for severe refractory pain — local anesthetic injection by urology; both diagnostic and therapeutic.

— Post-vasectomy epididymitis (sterile, congestive) treated with NSAIDs and scrotal support; rare cases require epididymectomy.

Most epididymitis does not require procedures — pharmacotherapy and supportive care suffice. Procedural intervention is reserved for complications.

Scrotal abscess:

Fournier gangrene (necrotizing fasciitis of the perineum/scrotum):

Testicular infarction/atrophy:

Chronic epididymitis (>3 months of pain):

Spermatic cord block:

Vasectomy reversal considerations:

Surgical exploration: when torsion cannot be excluded by Doppler — do not delay for confirmatory imaging if clinical suspicion remains high.

Step 3 management: Distinguish medical epididymitis (90%+, antibiotics + supportive) from the few surgical scenarios (abscess, Fournier, persistent mass concerning for malignancy, refractory torsion question). Recognizing the surgical scenarios is the high-yield Step 3 skill.

Board pearl: Crepitus on scrotal exam in a diabetic man = Fournier gangrene — broad-spectrum antibiotics + emergent surgical debridement + ICU. Do not waste time on prolonged imaging.

Special Populations — Elderly and Renal/Hepatic Impairment

— Epididymitis is overwhelmingly bacteriuria-driven — E. coli, Klebsiella, Proteus, Enterococcus.

— Always evaluate for underlying obstruction: BPH, urethral stricture, neurogenic bladder, indwelling catheter.

— Higher rates of abscess, sepsis, recurrence — lower threshold for admission, IV antibiotics, urology referral.

— Always screen for prostate cancer when working up an older man with recurrent epididymitis (PSA, DRE) and exclude testicular cancer if mass persists.

— Levofloxacin and ciprofloxacin require dose adjustment — e.g., levofloxacin 500 mg q48h if CrCl 20–49; cipro 250–500 mg q12–18h.

— TMP-SMX: reduce by 50% if CrCl 15–30; avoid if CrCl <15 unless on dialysis with adjustment.

— Ceftriaxone — no renal adjustment needed (biliary excretion).

— Doxycycline — no renal adjustment.

— Doxycycline — use with caution in severe hepatic dysfunction; generally safe.

— Fluoroquinolones — minor adjustments; monitor LFTs (rare hepatotoxicity).

— Avoid moxifloxacin in severe hepatic failure.

— Fluoroquinolones + warfarin: increased INR — monitor closely.

— Fluoroquinolones + QT-prolonging drugs (amiodarone, sotalol, methadone, ondansetron, antipsychotics): risk of torsades — obtain ECG, consider alternative.

— Doxycycline + antacids/iron/calcium: chelation — separate by 2 hours.

— Fluoroquinolones + sulfonylureas: hypoglycemia risk in diabetics.

— Tendon rupture risk with fluoroquinolones — higher in elderly, steroid users, transplant recipients.

— Fluoroquinolone-associated delirium/CNS toxicity in older adults — re-evaluate need; consider TMP-SMX.

Older men (≥35–65 yo and beyond):

Renal impairment (CrCl <50):

Hepatic impairment:

Polypharmacy and interactions:

Cognitive and falls considerations:

Step 3 management: In a 72-year-old man with BPH and acute epididymitis, the order set is UA, urine culture, PSA, renal-adjusted levofloxacin or TMP-SMX, scrotal Doppler, post-void residual, urology referral for BPH workup. Long-term, treat the obstruction to prevent recurrence — this longitudinal lens is the Step 3 hallmark.

Board pearl: Always check medication list for QT-prolonging drugs before prescribing a fluoroquinolone in older men.

Special Populations — Pediatrics, Pregnancy Context, and Sexual/Gender Minorities

— Epididymitis is uncommon — torsion is far more common in this age group; scrotal exploration is the default unless Doppler reliably shows hyperemia and intact flow.

— When confirmed, suspect underlying genitourinary anomaly: ectopic ureter, neurogenic bladder, posterior urethral valves, vesicoureteral reflux, prior instrumentation.

— Workup: urine culture, renal/bladder ultrasound, and VCUG in culture-positive or recurrent cases.

— Empirical antibiotics: narrow-spectrum cephalosporin or TMP-SMX per culture; avoid fluoroquinolones in growing children (cartilage concerns) unless no alternative.

— Many pediatric "epididymitis" cases are actually viral/post-viral inflammation and self-limited.

— Ask explicitly about insertive anal intercourse — this changes empiric coverage to include enteric organisms (Category B regimen: ceftriaxone + levofloxacin).

— Use gender-affirming language; transgender women on estrogen who retain testes can develop epididymitis — clinical approach is identical.

— Offer HIV PrEP counseling at every STI encounter; screen for HIV, syphilis, hepatitis B/C, extragenital GC/CT (pharyngeal, rectal swabs).

— Broader pathogen spectrum — CMV, fungi, mycobacteria.

— Lower threshold for admission, IV antibiotics, imaging.

Prepubertal boys (<14 yo):

Adolescents (≥14 yo, sexually active): treat as adult STI category — ceftriaxone + doxycycline; mandatory STI screening including HIV/syphilis; confidentiality counseling per state law.

Pregnancy: not directly applicable (male patient) — but partner pregnancy matters: doxycycline is contraindicated in the pregnant partner — substitute azithromycin 1 g for partner treatment of chlamydia.

Sexual and gender minority patients:

Immunocompromised patients (HIV, transplant, chemotherapy):

Recurrent mumps orchitis in unvaccinated: counsel on MMR catch-up vaccination of household contacts; report to public health.

Step 3 management: A 16-year-old with epididymitis — provide confidential STI care under most state minor consent laws, do not require parental consent for STI evaluation/treatment, but document carefully and counsel about disclosure.

Board pearl: Recurrent prepubertal epididymitis = anatomic anomaly until proven otherwise — get a VCUG and renal ultrasound, refer to pediatric urology.

Complications and Adverse Outcomes

— Scrotal abscess — fluctuant collection requiring drainage; 3–5% of cases.

— Pyocele — pus within tunica vaginalis.

— Testicular infarction — from severe inflammatory venous congestion; may require orchiectomy.

— Fournier gangrene — necrotizing fasciitis; diabetes and immunocompromise are major risks; mortality 20–40%.

— Sepsis/bacteremia — particularly in older men with bacteriuria.

— Reactive hydrocele — typically resolves with treatment.

— Chronic epididymitis — pain >3 months in ~10% of cases; difficult to manage; may require neuropathic pain agents and pelvic floor PT.

— Testicular atrophy — from prolonged inflammation or infarction; can affect endocrine function and fertility.

— Subfertility/infertility:

— Bilateral epididymal scarring → obstructive azoospermia.

— Mumps orchitis: bilateral cases cause infertility in ~10–30%, unilateral rarely.

— Counsel on sperm banking only in select severe cases.

— Hypogonadism — rare after severe bilateral testicular involvement; check morning testosterone if symptomatic.

— Missed torsion — testicular loss; major medicolegal pitfall.

— Missed testicular cancer — patient treated for "epididymitis" with persistent mass; delayed diagnosis worsens prognosis. Always recheck at 2–6 weeks.

— Missed Fournier gangrene — delay in surgical debridement → mortality.

— Fluoroquinolones: tendinopathy/rupture (Achilles), aortic aneurysm/dissection, QT prolongation, C. difficile, hypoglycemia, peripheral neuropathy, CNS effects.

— Ceftriaxone: hypersensitivity, biliary sludging.

— Doxycycline: photosensitivity, esophagitis (take upright with water), GI upset.

— Diagnosis of STI may trigger relationship/disclosure stress; offer counseling and resources.

Acute complications:

Subacute/chronic complications:

Misdiagnosis complications:

Treatment-related adverse events:

Psychosocial complications:

Step 3 management: Always document return precautions: worsening pain, fever, scrotal skin changes, inability to urinate, vomiting → ED. Provide written instructions.

Board pearl: A persistent firm intratesticular mass after antibiotic course is a tumor — order ultrasound + AFP/β-hCG/LDH; refer to urology promptly.

When to Escalate Care — Admission, Consult, and Surgical Triage

— Hemodynamically stable, afebrile or low-grade fever.

— Tolerating oral intake and oral antibiotics.

— No abscess on imaging.

— Reliable follow-up within 48–72 hours.

— No severe immunocompromise.

— Systemic toxicity: high fever, tachycardia, hypotension, sepsis criteria.

— Suspected or confirmed abscess requiring drainage.

— Intractable pain or vomiting preventing PO therapy.

— Immunocompromise (HIV with low CD4, neutropenia, transplant, chemotherapy).

— Failed outpatient therapy (no improvement at 48–72 h).

— Significant comorbidities — poorly controlled diabetes, advanced renal disease.

— Social factors precluding adherence/follow-up.

— Any plausible torsion → surgical exploration is the gold standard; do not wait for definitive imaging if suspicion remains.

— Abscess for drainage.

— Refractory pain.

— Suspected testicular mass.

— Recurrent/chronic epididymitis evaluation.

— Fournier gangrene — broad-spectrum antibiotics, emergent debridement, ICU-level resuscitation.

— Suspected genitourinary TB, brucellosis.

— Multidrug-resistant organisms.

— Treatment failure with atypical organisms.

— Gonorrhea, chlamydia, syphilis, HIV — mandatory reporting per state.

— Mumps — mandatory reportable.

— Pain controlled, tolerating PO, stable vitals, antibiotic in hand, urology follow-up arranged, written return precautions.

Outpatient management is appropriate when:

Admit for inpatient IV antibiotics when:

Emergent urology consultation:

Emergent general surgery + urology + ICU:

ID consultation:

Public health reporting:

Discharge from ED criteria:

CCS pearl: Sequence in a septic 75-year-old man with epididymo-orchitis and BPH: IV access × 2, blood cultures × 2, urine culture, lactate, IV fluids, IV ceftriaxone or piperacillin-tazobactam, urology consult, admit to medicine, monitor urine output, consider Foley after urology input (avoid traumatic catheterization if BPH severe).

Board pearl: "Pain out of proportion + crepitus + diabetic" → activate the Fournier pathway immediately; surgical delay >24 hours doubles mortality.

Key Differentials — Other Acute Scrotal Conditions

— Sudden severe pain, nausea/vomiting, high-riding transverse testis, absent cremasteric reflex, negative Prehn sign.

— Bimodal: neonatal and adolescent (~12–18 yo).

— Doppler: absent intratesticular flow.

— Window for salvage: <6 h ~90%, 12–24 h ~50%, >24 h <10%.

— Management: immediate surgical exploration with bilateral orchiopexy; manual detorsion ("open book" lateral rotation) is a temporizing measure.

— Common in boys 7–12 yo; gradual onset, focal upper-pole tenderness, "blue dot" sign.

— Doppler: normal testicular flow.

— Self-limited; NSAIDs and reassurance.

— Inguinoscrotal mass extending into scrotum, may have bowel sounds, vomiting, obstipation.

— Abdominal exam and inguinal ring palpation key.

— Surgical emergency if strangulated.

— Painless or dull ache; transilluminating (hydrocele) or "bag of worms" that decompresses supine (varicocele, usually left-sided).

— Sudden right-sided varicocele or non-decompressing varicocele → suspect retroperitoneal mass (e.g., renal cell carcinoma).

— Painless, firm, intratesticular mass; may be discovered after presumed epididymitis fails to resolve.

— Ultrasound + tumor markers (AFP, β-hCG, LDH); urology referral.

— Painless cystic structure above/posterior to testis; transilluminates.

Testicular torsion — the must-not-miss:

Torsion of testicular appendix (appendix testis):

Incarcerated/strangulated inguinal hernia:

Hydrocele/varicocele:

Testicular tumor:

Spermatocele/epididymal cyst:

Fournier gangrene — see chunks 8, 11, 12.

Trauma: hematocele, testicular rupture — history-driven; ultrasound to assess tunica integrity.

Henoch-Schönlein purpura (IgA vasculitis): in children, can mimic acute scrotum with scrotal involvement plus palpable purpura, abdominal pain, hematuria.

Key distinction: A palpable mass within the testis (not adjacent epididymis) is cancer until proven otherwise, regardless of pain status; an enlarged tender posterior cord structure is epididymitis.

Board pearl: All acute scrotum in a young man → Doppler ultrasound is the screening test, but never let it delay urology consult if torsion is clinically likely.

Key Differentials — Systemic and Referred Causes

— Acute bacterial prostatitis — fever, perineal/rectal pain, tender boggy prostate on gentle DRE, often coexists with epididymitis in older men; treat with same fluoroquinolone or TMP-SMX × 4–6 weeks.

— Urinary tract infection/pyelonephritis — flank pain, CVA tenderness, fever; may share organisms.

— Urethritis — discharge without scrotal pain; treat per CDC guidelines.

— Ureteral colic — flank-to-groin pain, hematuria; CT stone protocol clinches it.

— Appendicitis — RLQ pain that may radiate to scrotum.

— Inguinal hernia — see chunk 13.

— IgA vasculitis (HSP) in children — see chunk 13.

— Behçet disease — recurrent oral/genital ulcers, uveitis, orchitis.

— Polyarteritis nodosa — testicular pain from vasculitic orchitis; check ANCA, hepatitis B.

— Sarcoidosis — granulomatous epididymo-orchitis.

— Familial Mediterranean fever — recurrent serositis episodes including scrotal.

— Amiodarone — dose-related sterile epididymitis; reversible with dose reduction.

— Other rarely implicated agents.

— Genitourinary TB — chronic painless or low-grade scrotal swelling, sinus tracts, sterile pyuria; history of BCG instillation or pulmonary TB.

— Brucellosis — exposure to livestock or unpasteurized dairy.

— Syphilitic gumma — late syphilis; rare.

— Filariasis — endemic areas; chronic lymphatic obstruction.

— Lymphoma of testis (older men), leukemic infiltration.

— Always reconsider tumor when "epididymitis" persists despite therapy.

Genitourinary infections that mimic or coexist:

Referred abdominal/pelvic pathology:

Systemic inflammatory/autoimmune causes:

Drug-induced:

Granulomatous/infectious mimics:

Malignancy mimicking infection:

Key distinction: A man with recurrent epididymitis without UTI or STI risk factors — think systemic disease (Behçet, sarcoid, amiodarone, TB) and refer to urology and rheumatology.

Board pearl: Sterile pyuria + chronic scrotal sinus + history of BCG bladder instillation = GU tuberculosis — send AFB urine cultures × 3, start RIPE under ID guidance.

Secondary Prevention, Discharge Plan, and Long-Term Strategy

— Partner notification and treatment within 60 days of symptom onset — Expedited Partner Therapy (EPT) where legally permitted.

— Abstinence until both patient and partner(s) complete therapy and are asymptomatic (minimum 7 days from start of regimen).

— Repeat STI testing at 3 months (test-of-reinfection, not test-of-cure for chlamydia/gonorrhea — high reinfection rate ~20%).

— Counseling on safer sex practices, consistent condom use, reduction in partner number.

— Offer HIV PrEP (daily emtricitabine/tenofovir) to high-risk individuals.

— Vaccinate against HPV (through age 26, shared decision 27–45), hepatitis A/B, mpox if eligible.

— Address underlying obstruction — urology referral for BPH workup, urodynamics, treatment (alpha-blockers, 5-ARIs, or surgical).

— Manage indwelling catheters appropriately, minimize duration.

— Treat urethral strictures, neurogenic bladder.

— In recurrent UTI, consider chronic suppressive antibiotics under urology guidance.

— Counsel on potential subfertility; semen analysis in 3 months if fertility concern.

— MMR catch-up vaccination for household contacts.

— Continue scrotal support and NSAIDs as needed during recovery.

— Resume sexual activity only after symptom resolution and completion of therapy.

— Avoid prolonged sitting/cycling during acute recovery.

— MMR, HPV, Tdap, hepatitis B, influenza, COVID-19, mpox where indicated.

— Antibiotic (oral, full course).

— Scheduled NSAID.

— Scrotal support device.

— Pain plan (acetaminophen, brief opioid only if severe).

STI-related epididymitis (Categories A and B):

Bacteriuria-related epididymitis (Categories C and D):

Mumps orchitis:

Lifestyle and supportive measures:

Vaccinations to review:

Discharge medication checklist:

Step 3 management: Build secondary prevention into the discharge note — partner treatment, EPT prescription, 3-month rescreen scheduled, condom counseling documented, HIV PrEP discussion if applicable, vaccination gaps addressed. Step 3 rewards the longitudinal plan, not just the acute prescription.

Board pearl: Test-of-reinfection at 3 months is the right answer for chlamydia/gonorrhea — not "test-of-cure" — because reinfection rates dwarf treatment failure rates.

Follow-Up, Monitoring, and Counseling

— 48–72 hours: phone or in-person check — symptom improvement expected by 72 h. If no improvement → re-evaluate (consider abscess, resistance, alternative diagnosis, adherence).

— 2 weeks: in-person recheck — pain and swelling should be substantially resolved.

— 4–6 weeks: repeat exam to confirm complete resolution; if a mass persists, order ultrasound + tumor markers.

— 3 months: repeat NAAT for chlamydia/gonorrhea in STI cases (test-of-reinfection).

— Symptom resolution: pain, swelling, urinary symptoms, fever.

— Adherence to antibiotic course.

— Adverse drug effects: tendon pain, photosensitivity, GI upset, neuropsychiatric symptoms.

— In older men: voiding symptoms, post-void residual, PSA trajectory.

— Worsening pain or swelling despite 48 h of therapy.

— Fever >38.5°C or rigors.

— Scrotal skin discoloration, crepitus, drainage → emergent ED.

— Inability to urinate, vomiting, lightheadedness.

— Disease nature, expected course, importance of completing full antibiotic course.

— Sexual health: abstinence during therapy, condom use, partner treatment, HIV/STI co-testing.

— Activity: scrotal support, rest 1–2 days, gradual return.

— Fertility: reassurance for unilateral disease; advise semen analysis if bilateral or mumps orchitis with future fertility concerns.

— Mental health: address anxiety related to STI diagnosis, body image, fertility worries.

— Chronic epididymitis (pain >3 months): pelvic floor physical therapy, neuropathic pain agents (gabapentin, nortriptyline), spermatic cord block, multidisciplinary pain clinic.

— Use patient portal or telehealth follow-up for 48–72 h check — improves adherence and reduces no-shows.

— In STI cases, link to public health partner services for contact tracing.

Follow-up cadence:

Monitoring parameters:

Red-flag return precautions (written instructions):

Counseling content (document in chart):

Rehabilitation considerations:

Health systems context:

Step 3 management: Schedule the 2-week recheck and the 3-month STI rescreen at the index visit — closing the loop is a frequently tested Step 3 competency.

Board pearl: If a young man's "epididymitis" has not fully resolved at the 4–6 week recheck, order scrotal ultrasound and tumor markers — do not extend antibiotics another cycle.

Ethical, Legal, and Patient Safety Considerations

— Gonorrhea, chlamydia, syphilis, HIV, mumps, tuberculosis are reportable to local/state public health in all US jurisdictions.

— Reporting is not a HIPAA violation — it is a permitted disclosure under the public health exception.

— Document the report in the medical record.

— EPT is legally permitted in most US states for gonorrhea and chlamydia, prohibited in a few, and has variable status in others — know your state.

— Provide written information for the partner including instructions to seek formal evaluation, STI screening, and HIV testing.

— When EPT is not legal/feasible, use public health partner services for anonymous notification.

— Most US states allow adolescents to consent to STI evaluation and treatment without parental notification (minor consent laws — verify state-specific).

— Be cautious with billing/insurance: explanation of benefits (EOB) sent to parents may breach confidentiality — discuss options (cash pay, Title X clinic, confidential communication request).

— Scrotal exam: explain purpose; offer chaperone (best practice and many institutional policies require it for sensitive exams).

— Photographs: separate written consent.

— Antibiotic risks: discuss fluoroquinolone black-box warnings (tendinopathy, aortic aneurysm/dissection, neuropathy, CNS effects, hypoglycemia) — consider alternatives when reasonable, especially in elderly and athletes.

— Missed torsion is the highest-litigation pitfall in acute scrotum — document timing of onset, exam findings (cremasteric reflex, Prehn sign), Doppler results, and shared decision-making about urology consultation.

— Missed testicular cancer in young men is the second pitfall — schedule explicit follow-up and order ultrasound + tumor markers if mass persists.

— ED-to-clinic handoff: ensure antibiotic in hand, urology follow-up scheduled, written return precautions provided.

— Ask about sexual practices without assumption; avoid heteronormative framing.

— Use gender-affirming language for transgender and nonbinary patients with testes.

Mandatory disease reporting:

Partner notification and Expedited Partner Therapy (EPT):

Confidentiality, especially with minors:

Informed consent edge cases:

Patient safety — transition of care:

Implicit bias and inclusive care:

Step 3 management: At every STI visit, ensure the trifecta: report to public health, treat partners (EPT or referral), schedule 3-month rescreen — failure to close any one of these is a high-yield safety/quality lapse.

Board pearl: Even when a teenager declines parental notification, you can and must report the reportable STI to public health; this does not breach the adolescent's consent rights.

High-Yield Associations and Rapid-Fire Clinical Facts

— <35 yo, sexually active → Chlamydia trachomatis (most common overall), Neisseria gonorrhoeae.

— Insertive anal intercourse → add E. coli and enteric organisms.

— ≥35 yo, BPH, instrumentation → E. coli dominant.

— Prepubertal boys → enteric organisms + GU anomaly workup.

— Post-parotitis → mumps virus.

— Chronic granulomatous → TB, brucellosis, sarcoid, BCG-related.

— Onset 4–8 days post-parotitis.

— Unilateral in ~70%.

— Infertility rare (~10–30% in bilateral cases).

— No effective antiviral therapy — supportive only.

Most common pathogens by category:

Best initial test for acute scrotum: color Doppler ultrasound.

Best test to rule out torsion clinically: cremasteric reflex (most reliable bedside finding when absent).

Best test to confirm STI etiology: first-void urine NAAT for GC/CT.

Mumps orchitis facts:

Antibiotic mnemonic — Category A (STI): "Cef-Doxy" — Ceftriaxone 500 mg IM + Doxycycline 100 mg BID × 10 days.

Antibiotic mnemonic — Category B (anal intercourse): "Cef-Levo" — Ceftriaxone + Levofloxacin × 10 days.

Antibiotic mnemonic — Category C (older/enteric): "Levo or Cipro × 10 days."

Drug-induced epididymitis: think amiodarone.

Pediatric recurrent epididymitis: think ectopic ureter or GU anomaly → VCUG + renal ultrasound.

Painless intratesticular mass: testicular cancer — AFP, β-hCG, LDH, urology referral.

Crepitus + diabetic + scrotal pain: Fournier gangrene — emergent surgery.

Sterile pyuria + history of BCG: GU tuberculosis.

Persistent left-sided varicocele or new right-sided varicocele: consider retroperitoneal mass / renal cell carcinoma.

Reportable diseases: GC, CT, syphilis, HIV, mumps, TB.

Test-of-reinfection (not cure): repeat NAAT at 3 months for GC/CT.

CCS pearl: In any acute scrotum case on CCS, the first three orders are essentially fixed: IV access, scrotal Doppler ultrasound, urology consult on standby — proceed differently only after these establish or exclude torsion.

Board pearl: Ceftriaxone dose for gonorrhea was increased to 500 mg IM in the 2021 CDC update (1 g if ≥150 kg) — old answer of 250 mg is obsolete.

Board Question Stem Patterns

— 24-year-old man, 2 days of progressive left scrotal pain, dysuria, urethral discharge, new sexual partner. Exam: tender posterior epididymis, cremasteric reflex present, Prehn positive. UA pyuria. → Answer: Doppler ultrasound to exclude torsion; treat with ceftriaxone 500 mg IM + doxycycline 100 mg BID × 10 days; partner notification; rescreen at 3 months.

— 68-year-old with BPH and recent Foley after TURP, now scrotal pain and fever. UA + nitrite/leukocyte esterase, gram-negative rods. → Answer: Levofloxacin 500 mg daily × 10 days, urology follow-up to address BPH and post-void residual.

— 16-year-old, sudden severe scrotal pain × 3 hours, vomiting, high-riding testis, absent cremasteric reflex. → Answer: Immediate surgical exploration — do not delay for ultrasound.

— Unvaccinated college student, parotitis 5 days ago, now testicular pain and swelling. → Answer: Supportive care (NSAIDs, scrotal support, ice); no antibiotics; report to public health; counsel on potential subfertility.

— 28-year-old treated for epididymitis 6 weeks ago; persistent firm intratesticular mass. → Answer: Scrotal ultrasound + AFP, β-hCG, LDH; urology referral. Do not extend antibiotics.

— Diabetic with scrotal pain, crepitus, dusky skin, hypotension. → Answer: Broad-spectrum IV antibiotics (pip-tazo + vanc + clinda) + emergent surgical debridement.

— 6-year-old, second culture-positive epididymitis. → Answer: VCUG and renal ultrasound to evaluate for ectopic ureter/anatomic anomaly.

— 32-year-old MSM with scrotal pain and dysuria. → Answer: Ceftriaxone + levofloxacin (covers GC, CT, and enteric organisms).

— Chronic scrotal sinus, sterile pyuria, prior intravesical BCG. → Answer: AFB urine cultures × 3 and ID referral for RIPE therapy.

— 17-year-old requests confidential STI care; partner unavailable. → Answer: Treat the patient confidentially; offer EPT if state allows; report to public health; do not require parental consent for STI care.

Pattern 1 — Classic STI epididymitis:

Pattern 2 — Older bacteriuria-driven epididymitis:

Pattern 3 — Torsion red herring:

Pattern 4 — Mumps orchitis:

Pattern 5 — Missed testicular cancer:

Pattern 6 — Fournier gangrene:

Pattern 7 — Pediatric recurrent epididymitis:

Pattern 8 — Insertive anal intercourse:

Pattern 9 — GU tuberculosis:

Pattern 10 — Confidentiality/EPT:

Board pearl: The single most common Step 3 distractor is "extend antibiotics another 10 days" when the right answer is reimage and evaluate for tumor, abscess, or alternative diagnosis.

One-Line Recap

Epididymitis and orchitis are managed by first excluding torsion, then choosing empiric antibiotics by patient category — STI coverage (ceftriaxone + doxycycline) for sexually active men <35, enteric coverage (levofloxacin) for older or instrumented men, supportive care alone for mumps orchitis — followed by a closed-loop longitudinal plan of partner treatment, 48–72 hour symptom check, 2-week recheck, and 3-month STI rescreen, with vigilance for testicular cancer in any persistent mass.

Recap 1 — The algorithm: Rule out torsion (cremasteric reflex, Doppler) → stratify by age and sexual practices → empiric antibiotics per category → adjunctive NSAIDs, scrotal support, abstinence → structured follow-up.

Recap 2 — The pharmacology: Ceftriaxone 500 mg IM × 1 + doxycycline 100 mg BID × 10 days (STI); add or substitute levofloxacin 500 mg daily × 10 days for enteric coverage in older men or insertive anal intercourse; no antibiotics for mumps.

Recap 3 — The pitfalls: Missed torsion (highest medicolegal risk), missed testicular cancer (persistent mass after antibiotics), missed Fournier gangrene (crepitus + diabetic + toxic), missed anatomic anomaly in recurrent pediatric cases.

Recap 4 — The Step 3 lens: Build the longitudinal plan at the index visit — partner notification and EPT, public health reporting, 3-month test-of-reinfection, BPH/obstruction workup in older men, and vaccination updates (MMR, HPV, hepatitis B, mpox). Document chaperone use, consent, confidentiality for minors, and return precautions.

Board pearl: When in doubt on an exam stem, the two reflex actions are rule out torsion (Doppler + urology) and rule out cancer (ultrasound + AFP/β-hCG/LDH) — get these right and most questions follow.