Orchitis: Picture on left demonstrates testicular enlargement caused by infection within the body of the testis.
The inflammation has spread from the testis to the skin of the scrotum, with resulting edema causing fewer
skin folds over the right testicle. No transillumination is seen (picture on right) as the inflamed testis does not
allow the passage of light (as opposed to hydrocele shown above, which readily conducts light). This is not
always the case, as sometimes orchitis will cause a "reactive hydrocele" to form, which will transilluminate.
Charlie Goldberg, M.D. - UCSD Catalog of Clinical Images
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