Most testicular neoplasms in the first 4 years of life are classified as yolk sac tumors. Microscopic examination of a yolk sac tumor shows interlacing strands of epithelial cells surrounded by loose connective stroma. The lobular arrangement of cells, surrounded by empty spaces, leads to the formation of glomeruloid structures referred to as Schiller-Duval bodies. Although yolk sac tumors are malignant, timely orchiectomy results in a 95% cure rate. These tumors produce a -fetoprotein, which can be used for monitoring the recurrence of disease following surgery Human chorionic gonadotropin (choice E) is secreted by choriocarcinoma.Diagnosis: Yolk sac tumor