Atypical sperm granuloma of the epididymis mimicking a testicular mass.

Ultrasonography (US) plays a crucial role in the evaluation of scrotal masses and is highly accurate in distinguishing extratesticular from intratesticular lesions. Occasionally, however, it may be difficult to distinguish an extratesticular process adherent to the testis from an intratesticular mass on the basis of US findings. The authors present one such unusual case, in which an epididymal sperm granuloma mimicked a testicular mass.