What is the appropriate diagnosis and management for an adult male presenting with hypogastric pain radiating to the genitals?

Hypogastric Pain Radiating to Male Genitals: Diagnosis and Management

Immediate Priority: Rule Out Testicular Torsion

Any adult male presenting with hypogastric pain radiating to the genitals must be evaluated emergently for testicular torsion, as this surgical emergency requires intervention within 6-8 hours to prevent permanent testicular loss. 1

Clinical Assessment Algorithm

Step 1: Determine onset and severity of pain

• Sudden, severe onset with scrotal involvement → Testicular torsion until proven otherwise 1, 2
• Gradual onset over hours to days → Epididymitis more likely 1, 2
• Hypogastric pain without acute scrotal symptoms → Consider other pelvic/urological pathology

Step 2: Physical examination findings

• Negative Prehn sign (pain NOT relieved by testicular elevation) → Strongly suggests torsion 1
• Positive Prehn sign (pain relieved by elevation) → More consistent with epididymitis 2
• Firm, tender testicle with systemic symptoms → Torsion is the primary concern 2
• Gradual tenderness with epididymal enlargement → Epididymitis pattern 2

Diagnostic Approach

For suspected testicular torsion (high clinical suspicion):

• Immediate urological consultation WITHOUT waiting for imaging 1, 2
• Delaying surgery for imaging when clinical suspicion is high risks testicular loss 2
• If imaging is obtained, Duplex Doppler ultrasound shows decreased/absent testicular blood flow and the "whirlpool sign" of twisted spermatic cord 1

Common pitfall: Ultrasound has 69-96.8% sensitivity for torsion, meaning false-negatives occur in up to 30% of cases, particularly with partial torsion or spontaneous detorsion 1. Never let negative imaging delay surgical exploration when clinical suspicion remains high. 1

For intermediate suspicion:

• Urgent Duplex Doppler ultrasound of scrotum 1, 2
• Grayscale examination for "whirlpool sign" (96% sensitivity) 1
• Color Doppler assessment of testicular perfusion 1
• Compare to contralateral testicle as internal control 1

Age-Stratified Differential Diagnosis

Adolescents and young adults (<35 years):

• Epididymitis is most common overall (85-90% of acute testicular pain cases) 2, 3
  • In sexually active men: Chlamydia trachomatis or Neisseria gonorrhoeae 3
  • Gradual pain onset, positive Prehn sign, increased blood flow on Doppler 2, 3
• Testicular torsion has bimodal distribution with peak in postpubertal boys 1
  • Sudden severe pain, negative Prehn sign, absent flow on Doppler 1, 2

Adults >35 years:

• Epididymitis remains most common (600,000 cases annually in US) 1
  • Typically enteric organisms (E. coli) rather than STIs 3
• Testicular torsion is rare in this age group 1
• Consider segmental testicular infarction (median age 37-38 years, wedge-shaped avascular area on ultrasound) 1

Management Based on Diagnosis

Testicular Torsion (Surgical Emergency):

• Immediate urological consultation and surgical exploration 1, 2
• Surgery must occur within 6-8 hours of symptom onset 1, 2
• Bilateral orchiopexy performed to prevent contralateral torsion 1
• Do NOT delay for antibiotics or other interventions 2

Epididymitis:

• Sexually active men <35 years: Ceftriaxone 250 mg IM single dose PLUS doxycycline 100 mg PO twice daily for 10 days 3
• Men >35 years or suspected enteric organisms: Ofloxacin 300 mg PO twice daily for 10 days OR levofloxacino 500 mg PO once daily for 10 days 3
• Bed rest, scrotal elevation, analgesics 4
• Reassess if no improvement within 3 days 3

Critical pitfall: If testicular pain persists after completing antimicrobial treatment for epididymitis, testicular cancer must be included in the differential diagnosis 3

Other Causes of Hypogastric Pain Radiating to Genitals

Fournier gangrene (necrotizing soft tissue infection):

• Mean age 50 years, often with diabetes or immunocompromise 4
• Can begin insidiously with discrete perineal necrosis progressing rapidly over 1-2 days 4
• Requires aggressive surgical debridement and broad-spectrum antibiotics 4
• Mixed aerobic/anaerobic flora including staphylococci and Pseudomonas 4

Genital lichen sclerosus (adult males):

• Affects glans penis, coronal sulcus, frenulum, prepuce 5, 6
• Presents with difficulty with intercourse, phimosis, painful erections 5, 6
• Urethral involvement in 20% can cause voiding symptoms 5
• Perianal disease rarely seen in males 5, 6

Chronic pelvic pain syndromes:

• Superior hypogastric plexus involvement can cause chronic pelvic pain radiating to genitals 7, 8
• Consider in cancer patients (cervical, prostate, testicular) or radiation injury 7

Key Clinical Pearls

• Time is testicle: Any delay beyond 6-8 hours significantly increases risk of testicular loss with torsion 1, 2
• Clinical overlap is common: Presentations of torsion, epididymitis, and appendage torsion can overlap significantly 1
• Power Doppler is superior for detecting low-flow states, particularly in prepubertal patients 1
• Always use contralateral testis as internal control during ultrasound evaluation 1