A 6-year-old boy was found to have a nodule in the right testicle.

This is a rare benign tumor in the testis. The tumor is more common in pre-pubertal age and the great majority of cases are identified in children under one year of age.  By immunohistochemistry, these tumors are positive for inhibin, 

. It is important to separate these tumors from other germ cell tumors including yolk sac tumor, embryonal carcinoma, or other sarcomas including rhabdomyosarcoma.

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A 6-year-old boy was found to have a nodule in the right testicle. What is your diagnosis?

What Caused the Nodule in This Young Boy?