Yolk Sac Tumor (Endodermal Sinus Tumor):

*It is most common testicular tumor in infants and children up to 3 years of age.

*Histopathology of Tumor is showing cuboidal neoplastic cells arranged in a lacelike (reticular) or papillary pattern with primitive glomeruli (Schiller-Duval bodies) like structure which have a central blood vessel surrounded by tumor cells, enclosed inside a cystic space which is again covered by tumor cells.

*Tumor marker for these tumors are alpha-fetoprotein (AFP) and alpha-1-antitrypsin .