Supernumerary testicle: case report and bibliographic review.

OBJECTIVE We report a case of supernumerary testis, a rare anomaly with only around 100 cases reported in the literature. METHODS We describe the case of a 26-year-old man who consulted for a left paratesticular tumor. Physical examination and ultrasound showed a 2-cm nodular lesion over the left epididymis. The lesion was confirmed as supernumerary testis by surgical examination and biopsy and was subsequently excised, given the malignancy potential. RESULTS The supernumerary testis was evaluated using two standard classifications, one assessing function and embryological development, and the other assessing topography, anatomy, and reproductive potential. CONCLUSIONS The differential diagnosis for an intrascrotal mass should include the possibility of a supernumerary testis; hence, surgical examination and biopsy are necessary. Supernumerary testes should be excised in the case of pain, dysplasia, or in situ carcinoma, or whenever the biopsy is inconclusive.