Orchitis is an infection of the testicle, which is rarely isolated, and when in conjunction with the epididymis is called epididymo-orchitis.

Usually, bacteria retrogradely seed into the testis from the bladder or prostate. Can also be secondary to viral infection (e.g. mumps, Coxsackie virus). 

  • almost all cases are associated with epididymitis
  • isolated orchitis can be seen in mumps and syphilis

Ultrasound is the gold standard investigation. When compared with the other testis in the 'sunglasses view' features of orchitis include relative: 

  • hypoechogenicity: focal or diffuse
  • hypervascularity: focal or diffuse
  • swelling
  • scrotal wall thickening

A complex/septated hydrocele can be seen in the ipsilateral scrotum

  • ultrasound findings are very similar to a detorted testes; clinical differentiation is essential 
  • primary testicular malignancy should be considered, especially with focal changes
Ultrasound - testicular and scrotal
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Article information

rID: 21524
System: Urogenital
Tag: cases
Synonyms or Alternate Spellings:

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Cases and figures

  • Case 1
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  • Enlarged right te...
    Case 2: with a pyocele
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  • Case 3
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