Following tumour produce a marked elevation of:

• Yolk sac tumors are those that resemble the yolk sac, allantois, and extraembryonic, mesenchyme. • They are also known as endodermal sinus tumors. • Yolk sac tumors can be seen in males and females, involving the testis, ovary, and other sites, such as the mediastinum. • Pure yolk sac tumor is the most common testicular neoplasm in prepubertal children. • Almost all the patients with a yolk sac tumor either in pare form or mixed form have a significantly elevated serum Alpha fetoprotein (AFP).