A 40 year olde man comes to doctor because of enlargement of his breasts. Physical exam shows bilateral gynecomastia and an enlarged right testicle. Palpation of right testicle shows 3.5 cm non tender mass that does not transilluminate with light. Patient undergoes right orchiectomy which shows a well delineated, circumscribed mass with a golden brown homegenoeous cut surface. Microscopic examination shows a homegenous population of large, polygonal cells with abundant eosinophilic cytoplasm, indistinct cell boundaries and round central nuclei. Scattered rod shaped crystals are also seen. 1. What is the most likely underlying condition and why?

The development of the reproductive system begins with the formation of undifferentiated gonads and the paired mesonephric and paramesonephric ducts.