(Redirected from Epididymorchitis)


Scrotal anatomy
Adult testicle with epididymis (left is posterior): A. Head of epididymis, B. Body of epididymis, C. Tail of epididymis, and D. Vas deferens.

Clinical Features

  • Pain of gradual onset, peaks at 24hr
  • Dysuria
  • Urinary frequency
  • Fever
  • Pain relieved with elevation of testicle (Prehn sign)
    • Sensitivity: 91.3%, specificity: 78.3. Does not rule out testicular torsion

Differential Diagnosis

Testicular Diagnoses



Doppler ultrasound of epididymitis, seen as a substantial increase in blood flow in the left epididymis (top image), while it is normal in the right (bottom image). The thickness of the epididymis (between yellow crosses) is only slightly increased.
Acute epididymo-orchitis. Contrast-enhanced CT (a, b) shows thickened and engorged left spermatic cord, with inhomogeneous vascularisation of the ipsilateral epididymis (thin arrows) and testis (arrows). Ultrasound (c) reveals hypervascularisation of the epididymis (+).
  • Urinalysis
    • Pyuria seen in half of cases
  • Urine culture (children, elderly men)
  • Urine GC/Chlam (urethral discharge or age <40)
  • Ultrasound for equivocal cases
  • Older men should be evaluated for urinary retention


  • Based on clinical exam or ultrasound



  • For acute epididymitis likely caused by STI [1]
  • For acute epididymitis most likely caused by STI and enteric organisms (MSM)
  • For acute epididymitis most likely caused by enteric organisms

For persons weighing ≥150 kg, 1 g of ceftriaxone should be administered.

  • If med adherence is an issue [2]

Pediatric Epididymitis[3]

  • Rule out testicular torsion
  • Bed rest to ensure lymphatic drainage
  • Ice packs, acetaminophen, ibuprofen
  • Rarely oral narcotics
  • Pediatric urology follow up outpatient in non-toxic child for possible GU anatomical abnormalities
  • Antibiotics for 10-14 days, with urine culture sent:


  • Admit for systemic signs (fever, chills, nausea/vomiting) or toxic appearance
  • Discharge with urology follow-up in 1 week if non-toxic

See Also


  1. https://www.cdc.gov/std/treatment-guidelines/epididymitis.htm
  2. CDC 2022 guidelines
  3. Richman MN and Bukowski TP. Pediatric Epididymitis: Pathophysiology, Diagnosis, and Management. Infect Urol. 2001;14(2).