Schwannomas are usually benign tumors arising from Schwann cells of the peripheral nerve sheath. Most schwannomas are benign, although malignant cases are known to occur. These masses rarely occur in the retroperitoneum, comprising 0.5% to 5% of all schwannomas. Involvement of the urinary tract is rare, but the involvement of the testis, penis, spermatic cord, and tunica vaginalis has been previously reported.